Home » Public Forums » GMCnet » power protection
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| Re: [GMCnet] power protection [message #188425 is a reply to message #188422] |
Sat, 27 October 2012 05:52   |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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POSSIBLY useful. As are teats on a bull.
I've been RVing since 1958, covering the US from Key West to Fairbanks.
ONE time, I've had damage from shore power: At Winter Haven, FL about 5
years ago, the power company, working on a transformer a block away from
the campground, miswired something, creating a high voltage surge which
shut down the entire neighborhood, including the adjacent WalMart Super
Store. The power company immediately accepted responsibility and arranged
for repairs. I quickly received a new converter. Others in the campground
got new converters, microwaves, etc.
That device MIGHT had prevented that damage. But I'd have had to install
them in a LOT of different RV's over the years to have had continuous
protection.
JWID,
Ken H.
On Sat, Oct 27, 2012 at 2:10 AM, Richard wrote:
>
>
> I have been reading horror stories about power issues.
>
>
> Have any of you added something along these lines...
>
>
> http://www.bestconverter.com/EMS-HW50C-50-Amp-Hardwired-EMS-with-Remote-Display_p_510.html
>
>
> What do you think, is this just a solution is search of a problem?
> --
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] power protection [message #188585 is a reply to message #188425] |
Sun, 28 October 2012 20:13 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
|
Senior Member |
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I buy MOVs by the boatload for critical equipment. For GMC use, take a plug strip ($3 from WalMart) and add to it three MOVs, one across hot and neutral, and one from each to the ground pin. I'll try o tget the part numbers off the ones we use, for both 12V and 110v applications. For the truly paranoid, high speed gas gaps are also available for just a bit more, or you can buy built up protector boxes from several sources.
--johnny
'76 23' transmode norris
'76 palm beach
From: Ken Henderson <hend4800@bellsouth.net>
To: gmclist@temp.gmcnet.org
Sent: Saturday, October 27, 2012 6:52 AM
Subject: Re: [GMCnet] power protection
POSSIBLY useful. As are teats on a bull.
I've been RVing since 1958, covering the US from Key West to Fairbanks.
ONE time, I've had damage from shore power: At Winter Haven, FL about 5
years ago, the power company, working on a transformer a block away from
the campground, miswired something, creating a high voltage surge which
shut down the entire neighborhood, including the adjacent WalMart Super
Store. The power company immediately accepted responsibility and arranged
for repairs. I quickly received a new converter. Others in the campground
got new converters, microwaves, etc.
That device MIGHT had prevented that damage. But I'd have had to install
them in a LOT of different RV's over the years to have had continuous
protection.
JWID,
Ken H.
On Sat, Oct 27, 2012 at 2:10 AM, Richard wrote:
>
>
> I have been reading horror stories about power issues.
>
>
> Have any of you added something along these lines...
>
>
> http://www.bestconverter.com/EMS-HW50C-50-Amp-Hardwired-EMS-with-Remote-Display_p_510.html
>
>
> What do you think, is this just a solution is search of a problem?
> --
>
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Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
|
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| Re: [GMCnet] power protection [message #188621 is a reply to message #188585] |
Mon, 29 October 2012 08:41 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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Update.
For 220 circuits, DigiKey part no 495-1408-ND maker's S07K275.
For 120 circuits DigiKey part no 495-1406-ND maker's S07K130
for 12-24 ckts DigiKey part no is missing, maker's is S07K35.
I replace them every few years, they will eventually lose their clamping abi;ity. On the GMC, swap them out when you replace the tyres.
--johnny
'76 23' transmode norris
'76 palm beach
From: Johnny Bridges <jhbridges@ymail.com>
To: "gmclist@temp.gmcnet.org" <gmclist@temp.gmcnet.org>
Sent: Sunday, October 28, 2012 9:13 PM
Subject: Re: [GMCnet] power protection
I buy MOVs by the boatload for critical equipment. For GMC use, take a plug strip ($3 from WalMart) and add to it three MOVs, one across hot and neutral, and one from each to the ground pin. I'll try o tget the part numbers off the ones we use, for both 12V and 110v applications. For the truly paranoid, high speed gas gaps are also available for just a bit more, or you can buy built up protector boxes from several sources.
--johnny
'76 23' transmode norris
'76 palm beach
From: Ken Henderson <hend4800@bellsouth.net>
To: gmclist@temp.gmcnet.org
Sent: Saturday, October 27, 2012 6:52 AM
Subject: Re: [GMCnet] power protection
POSSIBLY useful. As are teats on a bull.
I've been RVing since 1958, covering the US from Key West to Fairbanks.
ONE time, I've had damage from shore power: At Winter Haven, FL about 5
years ago, the power company, working on a transformer a block away from
the campground, miswired something, creating a high voltage surge which
shut down the entire neighborhood, including the adjacent WalMart Super
Store. The power company immediately accepted responsibility and arranged
for repairs. I quickly received a new converter. Others in the campground
got new converters, microwaves, etc.
That device MIGHT had prevented that damage. But I'd have had to install
them in a LOT of different RV's over the years to have had continuous
protection.
JWID,
Ken H.
On Sat, Oct 27, 2012 at 2:10 AM, Richard wrote:
>
>
> I have been reading horror stories about power issues.
>
>
> Have any of you added something along these lines...
>
>
> http://www.bestconverter.com/EMS-HW50C-50-Amp-Hardwired-EMS-with-Remote-Display_p_510.html
>
>
> What do you think, is this just a solution is search of a problem?
> --
>
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Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] power protection [message #188638 is a reply to message #188621] |
Mon, 29 October 2012 11:57 |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Senior Member |
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Johnny,
How about a schematic or a picture to indicate the installation. Are
they polarity sensitive?
JR Wright
78 Buskirk Stretch
Michigan
> Update.
>
> For 220 circuits, DigiKey part no 495-1408-ND maker's S07K275.
> For 120 circuits DigiKey part no 495-1406-ND maker's S07K130
> for 12-24 ckts DigiKey part no is missing, maker's is S07K35.
>
> I replace them every few years, they will eventually lose their
> clamping abi;ity. On the GMC, swap them out when you replace the
> tyres.
>
> --johnny
> '76 23' transmode norris
> '76 palm beach
>
> From: Johnny Bridges <jhbridges@ymail.com>
> To: "gmclist@temp.gmcnet.org" <gmclist@temp.gmcnet.org>
> Sent: Sunday, October 28, 2012 9:13 PM
> Subject: Re: [GMCnet] power protection
>
> I buy MOVs by the boatload for critical equipment. For GMC use,
> take a plug strip ($3 from WalMart) and add to it three MOVs, one
> across hot and neutral, and one from each to the ground pin. I'll
> try o tget the part numbers off the ones we use, for both 12V and
> 110v applications. For the truly paranoid, high speed gas gaps are
> also available for just a bit more, or you can buy built up
> protector boxes from several sources.
>
> --johnny
> '76 23' transmode norris
> '76 palm beachem?
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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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| Re: [GMCnet] power protection [message #188642 is a reply to message #188638] |
Mon, 29 October 2012 13:29 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
|
Senior Member |
|
|
Non-polarized.
------------------ ground
x here
---------------------------------------------hot
x here
----------------------------------------------neutral
x here
-------------- ground
Any time either leg (hot or neutral) rises more than 130V about ground, the MOV will clamp it to 130V. Any thime the line voltage (hot to neutral) rises above 130V, the MOV will clamp it.
If you smell a truly amazing stink coming out of the plug strip or protected device, look and see if one or more of the MOVs aren't burnt up but have protected your equipment. They smell terrible when they short.. but they do save the TV.
We also use an LEA system on all our building feeds.... it's overkill for your GMC but necessary when things in the building are connected to a thousand foot lightningrod. They use on each leg of the three phase feed a gas gap to quickly limit the pulse, a BIG inductor to integrate the leading edge of the voltage rise, tand then big MOVs to clamp the voltage. Every now and again we see the fault light lit on a phase and when we open the cabinet, the gas gap and sometimes the MOV are diastributed about the enclosure in small tidbits. There is incredible energy in a lightnoing bolt. Other than the supressor cabinet stuff, we don't lose equipment. Although I have had to use a chisel to remove a piece or two from the equipment rack where the case got welded to the rack
I'll post some pictures of my latest plant, the hams here present might like to see a real - albeit not frequency agile - ransmitter :)
--johnny
'76 23' transmode norris
'76 palm beach
From: John Wright <powerjon@chartermi.net>
To: gmclist@temp.gmcnet.org
Sent: Monday, October 29, 2012 12:57 PM
Subject: Re: [GMCnet] power protection
Johnny,
How about a schematic or a picture to indicate the installation. Are
they polarity sensitive?
JR Wright
78 Buskirk Stretch
Michigan
> Update.
>
> For 220 circuits, DigiKey part no 495-1408-ND maker's S07K275.
> For 120 circuits DigiKey part no 495-1406-ND maker's S07K130
> for 12-24 ckts DigiKey part no is missing, maker's is S07K35.
>
> I replace them every few years, they will eventually lose their
> clamping abi;ity. On the GMC, swap them out when you replace the
> tyres.
>
> --johnny
> '76 23' transmode norris
> '76 palm beach
>
> From: Johnny Bridges <jhbridges@ymail.com>
> To: "gmclist@temp.gmcnet.org" <gmclist@temp.gmcnet.org>
> Sent: Sunday, October 28, 2012 9:13 PM
> Subject: Re: [GMCnet] power protection
>
> I buy MOVs by the boatload for critical equipment. For GMC use,
> take a plug strip ($3 from WalMart) and add to it three MOVs, one
> across hot and neutral, and one from each to the ground pin. I'll
> try o tget the part numbers off the ones we use, for both 12V and
> 110v applications. For the truly paranoid, high speed gas gaps are
> also available for just a bit more, or you can buy built up
> protector boxes from several sources.
>
> --johnny
> '76 23' transmode norris
> '76 palm beachem?
_______________________________________________
GMCnet mailing list
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Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
|
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| Re: [GMCnet] power protection [message #188663 is a reply to message #188642] |
Mon, 29 October 2012 16:34 |
 |
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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G'day,
Being electrically challenged I had no idea what MOV meant so I Googled it; Metal Oxide Varistor.
I also don't have a clue what a LEA system is so it got Googled as well; but noting electrical came up.
Regards,
Rob M.
-----Original Message-----
From: Johnny Bridges
Non-polarized.
------------------ ground
x here
---------------------------------------------hot
x here
----------------------------------------------neutral
x here
-------------- ground
Any time either leg (hot or neutral) rises more than 130V about ground, the MOV will clamp it to 130V. Any thime the line voltage
(hot to neutral) rises above 130V, the MOV will clamp it.
If you smell a truly amazing stink coming out of the plug strip or protected device, look and see if one or more of the MOVs aren't
burnt up but have protected your equipment. They smell terrible when they short.. but they do save the TV.
We also use an LEA system on all our building feeds.... it's overkill for your GMC but necessary when things in the building are
connected to a thousand foot lightningrod. They use on each leg of the three phase feed a gas gap to quickly limit the pulse, a BIG
inductor to integrate the leading edge of the voltage rise, tand then big MOVs to clamp the voltage. Every now and again we see the
fault light lit on a phase and when we open the cabinet, the gas gap and sometimes the MOV are diastributed about the enclosure in
small tidbits. There is incredible energy in a lightnoing bolt. Other than the supressor cabinet stuff, we don't lose equipment.
Although I have had to use a chisel to remove a piece or two from the equipment rack where the case got welded to the rack
I'll post some pictures of my latest plant, the hams here present might like to see a real - albeit not frequency agile - ransmitter
:)
--johnny
'76 23' transmode norris
'76 palm beach
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Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] power protection [message #188664 is a reply to message #188642] |
Mon, 29 October 2012 16:39 |
habbyguy
Messages: 896
Registered: May 2012
Location: Mesa, AZ
Karma: 3
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Senior Member |
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| Johnny Bridges wrote on Mon, 29 October 2012 11:29 |
Any time either leg (hot or neutral) rises more than 130V about ground, the MOV will clamp it to 130V. Any thime the line voltage (hot to neutral) rises above 130V, the MOV will clamp it.
|
Be very careful here... if you put in a MOV that clamps at 130 volts, you're going to cook it as soon as you flip the power switch (or generator or shore power or inverter). The normal peak voltage on a 120VAC circuit is around 170 volts (remember, the 120 volts is the "average" (or more accurately, RMS, or root x mean squared)). The correct MOV for a 120VAC circuit should clamp at well over 200 volts. For example, I just ordered six of these...
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=380325419830&ssPageName=ADME:L:OU:MOTORS:3160
... for a whopping $4.50 including shipping. I'm planning on wiring them directly into my breaker panel.
Mark Hickey
Mesa, AZ
1978 Royale Center Kitchen
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| Re: [GMCnet] power protection [message #188674 is a reply to message #188663] |
Mon, 29 October 2012 19:06 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
|
Senior Member |
|
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Lightning Elimination Systems. (They had a name change. Sorry) Brainchild of the guy who was in the forefront of hardening electronic facilities against EMP (Electromagntic Pulse). They sell a lot of equipment to broadcasters and two way/cell folks. Not suitable for motorhomes. Check their website. Their stuff ain't cheeeep but it works.
--johnny
'76 23' transnmode norris
'76 palm beach
From: Rob Mueller <robmueller@iinet.net.au>
To: gmclist@temp.gmcnet.org
Sent: Monday, October 29, 2012 5:34 PM
Subject: Re: [GMCnet] power protection
G'day,
Being electrically challenged I had no idea what MOV meant so I Googled it; Metal Oxide Varistor.
I also don't have a clue what a LEA system is so it got Googled as well; but noting electrical came up.
Regards,
Rob M.
-----Original Message-----
From: Johnny Bridges
Non-polarized.
------------------ ground
x here
---------------------------------------------hot
x here
----------------------------------------------neutral
x here
-------------- ground
Any time either leg (hot or neutral) rises more than 130V about ground, the MOV will clamp it to 130V. Any thime the line voltage
(hot to neutral) rises above 130V, the MOV will clamp it.
If you smell a truly amazing stink coming out of the plug strip or protected device, look and see if one or more of the MOVs aren't
burnt up but have protected your equipment. They smell terrible when they short.. but they do save the TV.
We also use an LEA system on all our building feeds.... it's overkill for your GMC but necessary when things in the building are
connected to a thousand foot lightningrod. They use on each leg of the three phase feed a gas gap to quickly limit the pulse, a BIG
inductor to integrate the leading edge of the voltage rise, tand then big MOVs to clamp the voltage. Every now and again we see the
fault light lit on a phase and when we open the cabinet, the gas gap and sometimes the MOV are diastributed about the enclosure in
small tidbits. There is incredible energy in a lightnoing bolt. Other than the supressor cabinet stuff, we don't lose equipment.
Although I have had to use a chisel to remove a piece or two from the equipment rack where the case got welded to the rack
I'll post some pictures of my latest plant, the hams here present might like to see a real - albeit not frequency agile - ransmitter
:)
--johnny
'76 23' transmode norris
'76 palm beach
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
|
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| Re: [GMCnet] power protection [message #188675 is a reply to message #188664] |
Mon, 29 October 2012 19:09 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
|
Senior Member |
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|
Well, I'm gonna assume that rating is the RMS cos I have dozens of them scattered about without problems.
--johnny
'76 23' transmode norris
'76 palm beach
From: Mark <mark@habcycles.com>
To: gmclist@temp.gmcnet.org
Sent: Monday, October 29, 2012 5:39 PM
Subject: Re: [GMCnet] power protection
Johnny Bridges wrote on Mon, 29 October 2012 11:29
> Any time either leg (hot or neutral) rises more than 130V about ground, the MOV will clamp it to 130V. Any thime the line voltage (hot to neutral) rises above 130V, the MOV will clamp it.
Be very careful here... if you put in a MOV that clamps at 130 volts, you're going to cook it as soon as you flip the power switch (or generator or shore power or inverter). The normal peak voltage on a 120VAC circuit is around 170 volts (remember, the 120 volts is the "average" (or more accurately, RMS, or root x mean squared)). The correct MOV for a 120VAC circuit should clamp at well over 200 volts. For example, I just ordered six of these...
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=380325419830&ssPageName=ADME:L:OU:MOTORS:3160
... for a whopping $4.50 including shipping. I'm planning on wiring them directly into my breaker panel.
--
Mark Hickey
Mesa, AZ
1978 Royale Center Kitchen
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_______________________________________________
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Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
|
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| Re: [GMCnet] power protection [message #188679 is a reply to message #188675] |
Mon, 29 October 2012 19:42 |
habbyguy
Messages: 896
Registered: May 2012
Location: Mesa, AZ
Karma: 3
|
Senior Member |
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| Johnny Bridges wrote on Mon, 29 October 2012 17:09 |
Well, I'm gonna assume that rating is the RMS cos I have dozens of them scattered about without problems.
|
That's what I figured. I just didn't want anyone to go out and buy some MOVs that actually clamp at 130VAC (or thereabouts).
The ones I bought are "rated" for 120VAC work, but actually clamp at 240 volts, which should be plenty sensitive to catch any really dangerous voltage spikes. With power coming from a generator and a modified sine wave inverter, I have to assume there could regularly be "glitches" that would exceed the "normal" 170 volt "peak" on a typical 120VAC circuit, so want to clamp well above 170 volts (so I don't fry my MOVs) but not TOO high (so I don't fry everything else). 240 volts seems like a good compromise.
Mark Hickey
Mesa, AZ
1978 Royale Center Kitchen
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| Re: [GMCnet] power protection [message #188680 is a reply to message #188678] |
Mon, 29 October 2012 19:54 |
habbyguy
Messages: 896
Registered: May 2012
Location: Mesa, AZ
Karma: 3
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Senior Member |
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| k2gkk wrote on Mon, 29 October 2012 17:26 |
Wonder what they'd charge to protect my house and
the ham radio tower I've put up recently!
|
I worked on a NJ State Police system that used a very robust lightning protection approach. They built a copper "frame" into the shack, then connected it via heavy copper cable at all four corners to a buried grid of more heavy copper wire, all cad-welded together and with plenty of long copper-plated grounding rods driven in and cad-welded to the system. Lightning loops in all the feedlines and the tower was grounded in a similar manner to the shack.
I got to see just how well that system worked one day when one of the (trunking) antennas took a direct hit. There was fiberglass scattered all over the site from the antenna (which looked like a bomb went off in it) but we had virtually no other damage and even got to keep the original feedline. Pretty impressive...
Mark Hickey
Mesa, AZ
1978 Royale Center Kitchen
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| Re: [GMCnet] power protection [message #188685 is a reply to message #188675] |
Mon, 29 October 2012 20:49 |
k2gkk
Messages: 4452
Registered: November 2009
Karma: -8
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Senior Member |
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$4.50?? They show at 2.99 each!
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
~~ ~ D C "Mac" Macdonald ~ ~~
~ ~ Amateur Radio - K2GKK ~ ~
~ ~ USAF and FAA, Retired ~ ~
~ ~ ~ Oklahoma City, OK ~ ~ ~
~~ ~ ~ "The Money Pit" ~ ~ ~~
~ ~ ~ ~ TZE166V101966 ~ ~ ~ ~
~ ~ ~ '76 ex-Palm Beach ~ ~ ~
~ www.gmcmhphotos.com/okclb ~
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
______________
*[ ]~~~[][ ][|\
*--OO--[]---O-*
> Date: Mon, 29 Oct 2012 17:09:44 -0700
> From: jhbridges@ymail.com
> To: gmclist@temp.gmcnet.org
> Subject: Re: [GMCnet] power protection
>
> Well, I'm gonna assume that rating is the RMS cos I have dozens of them scattered about without problems.
>
> --johnny
> '76 23' transmode norris
> '76 palm beach
>
> From: Mark <mark@habcycles.com>
> To: gmclist@temp.gmcnet.org
> Sent: Monday, October 29, 2012 5:39 PM
> Subject: Re: [GMCnet] power protection
>
>
>
> Johnny Bridges wrote on Mon, 29 October 2012 11:29
> > Any time either leg (hot or neutral) rises more than 130V about ground, the MOV will clamp it to 130V. Any thime the line voltage (hot to neutral) rises above 130V, the MOV will clamp it.
>
>
> Be very careful here... if you put in a MOV that clamps at 130 volts, you're going to cook it as soon as you flip the power switch (or generator or shore power or inverter). The normal peak voltage on a 120VAC circuit is around 170 volts (remember, the 120 volts is the "average" (or more accurately, RMS, or root x mean squared)). The correct MOV for a 120VAC circuit should clamp at well over 200 volts. For example, I just ordered six of these...
>
> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=380325419830&ssPageName=ADME:L:OU:MOTORS:3160
>
> ... for a whopping $4.50 including shipping. I'm planning on wiring them directly into my breaker panel.
>
> --
> Mark Hickey
> Mesa, AZ
> 1978 Royale Center Kitchen
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| Re: [GMCnet] power protection [message #188689 is a reply to message #188679] |
Mon, 29 October 2012 22:16 |
gbarrow2
Messages: 765
Registered: February 2004
Location: Lake Almanor, Ca./ Red Bl...
Karma: 3
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Senior Member |
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Are you techie guys paranoid or just better informed than the rest of us?
Is this something that we regular folks should be concerned about?
I've got plenty of simple real world issues to worry about.
Gene Barrow
Lake Almanor, Ca.
1976 Palm Beach
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| Re: [GMCnet] power protection [message #188691 is a reply to message #188621] |
Mon, 29 October 2012 22:34 |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
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Senior Member |
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>
> I replace them every few years, they will eventually lose their clamping
> abi;ity. On the GMC, swap them out when you replace the tyres.
>
>
this is the problem I have had with MOV devices,
- you cannot tell if they are workiing
- you cannot tell if they are broken
- everything is on --faith--
when ever I buy a used plug strip, I assume they are not working
- cause you cannot tell
jwid
gene
> --johnny
> '76 23' transmode norris
> '76 palm beach
>
> From: Johnny Bridges <jhbridges@ymail.com>
> To: "gmclist@temp.gmcnet.org" <gmclist@temp.gmcnet.org>
> Sent: Sunday, October 28, 2012 9:13 PM
> Subject: Re: [GMCnet] power protection
>
> I buy MOVs by the boatload for critical equipment. For GMC use, take a
> plug strip ($3 from WalMart) and add to it three MOVs, one across hot and
> neutral, and one from each to the ground pin. I'll try o tget the part
> numbers off the ones we use, for both 12V and 110v applications. For the
> truly paranoid, high speed gas gaps are also available for just a bit more,
> or you can buy built up protector boxes from several sources.
>
> --johnny
> '76 23' transmode norris
> '76 palm beach
>
> From: Ken Henderson <hend4800@bellsouth.net>
> To: gmclist@temp.gmcnet.org
> Sent: Saturday, October 27, 2012 6:52 AM
> Subject: Re: [GMCnet] power protection
>
> POSSIBLY useful. As are teats on a bull.
>
> I've been RVing since 1958, covering the US from Key West to Fairbanks.
> ONE time, I've had damage from shore power: At Winter Haven, FL about 5
> years ago, the power company, working on a transformer a block away from
> the campground, miswired something, creating a high voltage surge which
> shut down the entire neighborhood, including the adjacent WalMart Super
> Store. The power company immediately accepted responsibility and arranged
> for repairs. I quickly received a new converter. Others in the campground
> got new converters, microwaves, etc.
>
> That device MIGHT had prevented that damage. But I'd have had to install
> them in a LOT of different RV's over the years to have had continuous
> protection.
>
> JWID,
>
> Ken H.
>
>
> On Sat, Oct 27, 2012 at 2:10 AM, Richard wrote:
>
> >
> >
> > I have been reading horror stories about power issues.
> >
> >
> > Have any of you added something along these lines...
> >
> >
> >
> http://www.bestconverter.com/EMS-HW50C-50-Amp-Hardwired-EMS-with-Remote-Display_p_510.html
> >
> >
> > What do you think, is this just a solution is search of a problem?
> > --
> >
> _______________________________________________
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--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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| Re: [GMCnet] power protection [message #188703 is a reply to message #188685] |
Tue, 30 October 2012 01:14 |
habbyguy
Messages: 896
Registered: May 2012
Location: Mesa, AZ
Karma: 3
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Senior Member |
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| k2gkk wrote on Mon, 29 October 2012 18:49 |
$4.50?? They show at 2.99 each!
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$2.99 is for three of 'em, including shipping. I offered $4.50 for six (that is, two sets of three), delivered - and they took it (probably could have gotten 'em for a little less, but you have to ask yourself just how much time you should spend trying to save $0.25).
Mark Hickey
Mesa, AZ
1978 Royale Center Kitchen
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| Re: [GMCnet] power protection [message #188710 is a reply to message #188678] |
Tue, 30 October 2012 06:51 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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No idea. Power conditioning for the last one we built ran right around 6 GMC Units and a couple hundred to ship it up here. That was for a three phase 400KVA box.
--johnny
From: D C _Mac_ Macdonald <k2gkk@hotmail.com>
To: "gmclist@temp.gmcnet.org" <gmclist@temp.gmcnet.org>
Sent: Monday, October 29, 2012 8:26 PM
Subject: Re: [GMCnet] power protection
I googled "lightning elimination systems" and think
I have found their website: http://www.nolightning.com/
They are in Louisiana, if this is the same outfit.
Wonder what they'd charge to protect my house and
the ham radio tower I've put up recently!
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
~~ ~ D C "Mac" Macdonald ~ ~~
~ ~ Amateur Radio - K2GKK ~ ~
~ ~ USAF and FAA, Retired ~ ~
~ ~ ~ Oklahoma City, OK ~ ~ ~
~~ ~ ~ "The Money Pit" ~ ~ ~~
~ ~ ~ ~ TZE166V101966 ~ ~ ~ ~
~ ~ ~ '76 ex-Palm Beach ~ ~ ~
~ www.gmcmhphotos.com/okclb ~
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
______________
*[ ]~~~[][ ][|\
*--OO--[]---O-*
> Date: Mon, 29 Oct 2012 17:06:53 -0700
> From: jhbridges@ymail.com
> To: gmclist@temp.gmcnet.org
> Subject: Re: [GMCnet] power protection
>
> Lightning Elimination Systems. (They had a name change. Sorry) Brainchild of the guy who was in the forefront of hardening electronic facilities against EMP (Electromagntic Pulse). They sell a lot of equipment to broadcasters and two way/cell folks. Not suitable for motorhomes. Check their website. Their stuff ain't cheeeep but it works.
>
> --johnny
>
> '76 23' transnmode norris
> '76 palm beach
>
> From: Rob Mueller <robmueller@iinet.net.au>
> To: gmclist@temp.gmcnet.org
> Sent: Monday, October 29, 2012 5:34 PM
> Subject: Re: [GMCnet] power protection
>
> G'day,
>
> Being electrically challenged I had no idea what MOV meant so I Googled it; Metal Oxide Varistor.
>
> I also don't have a clue what a LEA system is so it got Googled as well; but noting electrical came up.
>
> Regards,
> Rob M.
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Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] power protection [message #188711 is a reply to message #188679] |
Tue, 30 October 2012 06:54 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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Usually the energy in spikes and crud is small enough that the MOV kind of clips it without any great histrionics. I'm currently getting better looking power out of my big on-line UPS than from Georgia Power. We bypassed it to put new batteries in a while back, and the line monitor got real unhappy. Ity looks really cruddy on a scope (the commercial power). I suspect the elevator engines in the building garbage it up somewhat.
--johnny
'76 23' transmode norris
'76 palm beach
From: Mark <mark@habcycles.com>
To: gmclist@temp.gmcnet.org
Sent: Monday, October 29, 2012 8:42 PM
Subject: Re: [GMCnet] power protection
Johnny Bridges wrote on Mon, 29 October 2012 17:09
> Well, I'm gonna assume that rating is the RMS cos I have dozens of them scattered about without problems.
That's what I figured. I just didn't want anyone to go out and buy some MOVs that actually clamp at 130VAC (or thereabouts).
The ones I bought are "rated" for 120VAC work, but actually clamp at 240 volts, which should be plenty sensitive to catch any really dangerous voltage spikes. With power coming from a generator and a modified sine wave inverter, I have to assume there could regularly be "glitches" that would exceed the "normal" 170 volt "peak" on a typical 120VAC circuit, so want to clamp well above 170 volts (so I don't fry my MOVs) but not TOO high (so I don't fry everything else). 240 volts seems like a good compromise.
--
Mark Hickey
Mesa, AZ
1978 Royale Center Kitchen
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Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] power protection [message #188712 is a reply to message #188680] |
Tue, 30 October 2012 06:59 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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Yeah. Properly doen, everything in the facility rises and falls with the stroke as it goes to ground. As long as everything moves together, there's no differential and no damage. When we get hit, usually there's no damage unless one of the antenna arms takes a direct shot. That usually burns a hole in it and we lose pressure integrity. Beyond that though, I don't normally get damage. Big power grid tubes make pretty good arc gaps. My transistor radios are all third generation or newer, and the makers have done a good job of keeping the devices away from the flashes - whach wasn't always the case in the past.
--johnny
'76 23' transmode norris
'76 palm beach.
From: Mark <mark@habcycles.com>
To: gmclist@temp.gmcnet.org
Sent: Monday, October 29, 2012 8:54 PM
Subject: Re: [GMCnet] power protection
k2gkk wrote on Mon, 29 October 2012 17:26
> Wonder what they'd charge to protect my house and
> the ham radio tower I've put up recently!
I worked on a NJ State Police system that used a very robust lightning protection approach. They built a copper "frame" into the shack, then connected it via heavy copper cable at all four corners to a buried grid of more heavy copper wire, all cad-welded together and with plenty of long copper-plated grounding rods driven in and cad-welded to the system. Lightning loops in all the feedlines and the tower was grounded in a similar manner to the shack.
I got to see just how well that system worked one day when one of the (trunking) antennas took a direct hit. There was fiberglass scattered all over the site from the antenna (which looked like a bomb went off in it) but we had virtually no other damage and even got to keep the original feedline. Pretty impressive...
--
Mark Hickey
Mesa, AZ
1978 Royale Center Kitchen
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Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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