Home » Public Forums » GMCnet » Installing a current transformer in a 30/50 amp system
| Re: [GMCnet] Installing a current transformer in a 30/50 amp system [message #238621 is a reply to message #238608] |
Mon, 03 February 2014 11:08   |
Ronald Pottol
Messages: 505
Registered: September 2012
Location: Redwood City, California
Karma: -2
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Senior Member |
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A friend had that happen to him in the Navy, took 440v in one hand and out
the other. He's still with us, and for someone with his temper, he seemed
remarkably at ease with not seeking any retribution. It seems what the
chiefs did was enough.
;-)
On Mon, Feb 3, 2014 at 8:09 AM, Johnny Bridges <jhbridges@ymail.com> wrote:
> A traveling engineer friend carries a single jumper cable about three feet
> long, which he uses to jump across the spark gap on AM transmitting towers
> before he works on the tuning units. Both ends are arced many times. He's
> still with us. If it's over 48 volts, I lay a screwdriver across the
> feed. My screwdriver is arced as well. Turn it off anf tag it and some
> numbnuts will sometimes turn it back on anyway.
>
> ==johnny
> '76 23' transmode norris
>
>
>
>
>
> ________________________________
> From: Ken Burton <n9cv@comcast.net>
> To: gmclist@temp.gmcnet.org
> Sent: Sunday, February 2, 2014 12:54 AM
> Subject: Re: [GMCnet] Installing a current transformer in a 30/50 amp
> system
>
>
>
>
> USAussie wrote on Sat, 01 February 2014 16:02
> > G'day,
> >
> >
> > We don't think about it here, I guess because 110/120V doesn't hurt as
> much as 220V.
> >
> > FROM MY PERSONAL EXPERIENCE 110/120 WILL "GET YOUR ATTENTION" IF YOU
> GRAB A HOT LEAD, 220 WILL "KNOCK YOU FOR A LOOP! "
>
> Over the years I have been shocked on 120AC, 230AC, 250DC, and 440AC.
> They all get your attention at a rate directly related to the voltage
> number.
>
> I'll carefully work on 120 AC with the power on if necessary. I got hung
> one time on 440AC and my helper just stood there and stared at me. My legs
> finally gave out and I fell away from it.
>
> Intelligent people do not stick their fingers in a wall or lamp socket.
> Leave the power on and let Darwin take over.
>
> We use to change overhead light bulbs by riding around on top of the crane
> trolley. The craneman positioned you under the offending bulb and you went
> to work. They were 240 AC ungrounded. Meaning there was no neutral
> grounding involved.
>
> You do not shut down and entire bay in a steel mill just to change a bulb
> or replace a socket. It was all done live.
>
> You stood a bigger chance of falling off of the crane trolley than you did
> of getting shocked. This was before OSHA.
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
>
> _______________________________________________
> GMCnet mailing list
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--
Plato seems wrong to me today.
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| Re: [GMCnet] Installing a current transformer in a 30/50 amp system [message #238622 is a reply to message #238621] |
Mon, 03 February 2014 11:24 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Many years ago, while employed as a stores clerk, Gofer, kinda job, I was
recruited to help pull some wires into an electrical panel that had 440
volts in it. I was on the other side of the wall from the panel, and was
providing the brute force on pulling the conductors. The electrician was on
the panel side of the wall. the ends of the wires curled around and made
contact with the buss bar in the top of the panel, Circuit path was through
the electricians fingers and forearms where it jumped from his funnybone to
the edge of the panel box. I felt a strong surge of current and the room
suddenly became dark. I walked out of the dark, the emergency lights were
on, and the electrician was looking at his elbow, which was smoking. He
lost a piece of flesh about the size of a 50 cent piece from his elbow, and
it was cauterized and not bleeding. Let me tell you I was very impressed
with what that stuff can do. I leave that stuff to those who profess to
know what they are doing now. I know engines and low voltage direct current
stuff. I leave high voltage to someone else.
Jim Hupy
Salem, OR
78 GMC Royale 403
On Mon, Feb 3, 2014 at 9:08 AM, Ronald Pottol <ronaldpottol@gmail.com>wrote:
> A friend had that happen to him in the Navy, took 440v in one hand and out
> the other. He's still with us, and for someone with his temper, he seemed
> remarkably at ease with not seeking any retribution. It seems what the
> chiefs did was enough.
>
> ;-)
>
>
> On Mon, Feb 3, 2014 at 8:09 AM, Johnny Bridges <jhbridges@ymail.com>
> wrote:
>
> > A traveling engineer friend carries a single jumper cable about three
> feet
> > long, which he uses to jump across the spark gap on AM transmitting
> towers
> > before he works on the tuning units. Both ends are arced many times.
> He's
> > still with us. If it's over 48 volts, I lay a screwdriver across the
> > feed. My screwdriver is arced as well. Turn it off anf tag it and some
> > numbnuts will sometimes turn it back on anyway.
> >
> > ==johnny
> > '76 23' transmode norris
> >
> >
> >
> >
> >
> > ________________________________
> > From: Ken Burton <n9cv@comcast.net>
> > To: gmclist@temp.gmcnet.org
> > Sent: Sunday, February 2, 2014 12:54 AM
> > Subject: Re: [GMCnet] Installing a current transformer in a 30/50 amp
> > system
> >
> >
> >
> >
> > USAussie wrote on Sat, 01 February 2014 16:02
> > > G'day,
> > >
> > >
> > > We don't think about it here, I guess because 110/120V doesn't hurt as
> > much as 220V.
> > >
> > > FROM MY PERSONAL EXPERIENCE 110/120 WILL "GET YOUR ATTENTION" IF YOU
> > GRAB A HOT LEAD, 220 WILL "KNOCK YOU FOR A LOOP! "
> >
> > Over the years I have been shocked on 120AC, 230AC, 250DC, and 440AC.
> > They all get your attention at a rate directly related to the voltage
> > number.
> >
> > I'll carefully work on 120 AC with the power on if necessary. I got hung
> > one time on 440AC and my helper just stood there and stared at me. My
> legs
> > finally gave out and I fell away from it.
> >
> > Intelligent people do not stick their fingers in a wall or lamp socket.
> > Leave the power on and let Darwin take over.
> >
> > We use to change overhead light bulbs by riding around on top of the
> crane
> > trolley. The craneman positioned you under the offending bulb and you
> went
> > to work. They were 240 AC ungrounded. Meaning there was no neutral
> > grounding involved.
> >
> > You do not shut down and entire bay in a steel mill just to change a bulb
> > or replace a socket. It was all done live.
> >
> > You stood a bigger chance of falling off of the crane trolley than you
> did
> > of getting shocked. This was before OSHA.
> > --
> > Ken Burton - N9KB
> > 76 Palm Beach
> > Hebron, Indiana
> >
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> >
>
>
>
> --
> Plato seems wrong to me today.
> _______________________________________________
> GMCnet mailing list
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| Re: Installing a current transformer in a 30/50 amp system [message #238635 is a reply to message #237865] |
Mon, 03 February 2014 12:56 |
kingd
Messages: 592
Registered: June 2004
Karma: 2
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Senior Member |
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In the early 70's when I worked in the typewriter plant for IBM Toronto, we made equipment for use in North Amerca and other places around the world,except specific places in Europe.
Most of the stuff we made had a motor. To be able to run this equipment as it would at a customer we had at least one motor/generator. I know we used to make 220 V 50Hz by running a generator driven by 240 V 60 Hz motor.
I guess you could always lug M/G around on the back porch of a M/H
DAVE KING
lurker, wannabe
Toronto, Ontario, Canada
[Updated on: Mon, 03 February 2014 12:57] Report message to a moderator |
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| Re: Installing a current transformer in a 30/50 amp system [message #238640 is a reply to message #238635] |
Mon, 03 February 2014 13:25 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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| kingd wrote on Mon, 03 February 2014 12:56 |
In the early 70's when I worked in the typewriter plant for IBM Toronto, we made equipment for use in North Amerca and other places around the world,except specific places in Europe.
Most of the stuff we made had a motor. To be able to run this equipment as it would at a customer we had at least one motor/generator. I know we used to make 220 V 50Hz by running a generator driven by 240 V 60 Hz motor.
I guess you could always lug M/G around on the back porch of a M/H
|
I am picturing a Selectric running 20% slower. That would make for some service complaints.
We had keypunch operators that could tell when keypunch punch clutches were slow to activate. One trick we used was to get out the biggest screwdriver we had and stand behind the machine and stick it inside. Then tell the operator to try it. After 3 or 4 tries the operator would say it was better and we got out of there as fast ass we could.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Installing a current transformer in a 30/50 amp system [message #238651 is a reply to message #238621] |
Mon, 03 February 2014 16:10 |
k2gkk
Messages: 4452
Registered: November 2009
Karma: -8
|
Senior Member |
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The US Air Force electronic shops all had a "grounding stick" which was a dry, wooden cane (probably fiberglass now) that had a spike on the end and a large flat braid grounding conductor with large alligator clamp that you hooked to chassis ground. If the tech was working around ANY circuits that may have had high voltage on them (capacitors hold LOTS of charge), that device was used to get rid of any voltage. Made a hell of a lot of noise if there was high voltage present!
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
~~ ~ D C "Mac" Macdonald ~ ~~
~ ~ Amateur Radio - K2GKK ~ ~
~~ k2gkk @ hotmail dot com ~~
~ ~ USAF and FAA, Retired ~ ~
~ ~ ~ Oklahoma City, OK ~ ~ ~
~~ ~ ~ "The Money Pit" ~ ~ ~~
~ ~ ~ ex-Palm Beach, 76 ~ ~ ~
~~ k2gkk + hotmail dot com ~~
~ www.gmcmhphotos.com/okclb ~
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
______________
*[ ]~~~[][ ][|\
*--OO--[]---O-*
> Date: Mon, 3 Feb 2014 09:08:47 -0800
> From: ronaldpottol@gmail.com
> To: gmclist@temp.gmcnet.org
> Subject: Re: [GMCnet] Installing a current transformer in a 30/50 amp system
>
> A friend had that happen to him in the Navy, took 440v in one hand and out
> the other. He's still with us, and for someone with his temper, he seemed
> remarkably at ease with not seeking any retribution. It seems what the
> chiefs did was enough.
>
> ;-)
>
>
> On Mon, Feb 3, 2014 at 8:09 AM, Johnny Bridges <jhbridges@ymail.com> wrote:
>
> > A traveling engineer friend carries a single jumper cable about three feet
> > long, which he uses to jump across the spark gap on AM transmitting towers
> > before he works on the tuning units. Both ends are arced many times. He's
> > still with us. If it's over 48 volts, I lay a screwdriver across the
> > feed. My screwdriver is arced as well. Turn it off anf tag it and some
> > numbnuts will sometimes turn it back on anyway.
> >
> > ==johnny
> > '76 23' transmode norris
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| Re: [GMCnet] Installing a current transformer in a 30/50 amp system [message #238708 is a reply to message #238703] |
Mon, 03 February 2014 22:18 |
GMC_LES
Messages: 569
Registered: October 2009
Location: Montreal
Karma: 0
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Senior Member |
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It was a separate auction. I may have been the second bidder on the item you won as i had bid on one and was outbid. I hate how eBay has resorted to hiding the bidder ID until bidding is over. It makes it hard to avoid bidding against friends.
Les Burt
Montreal
1975 Eleganza 26ft
A work in Progress
On Feb 3, 2014, at 10:27 PM, "Robert Mueller" <robmueller@iinet.net.au> wrote:
Les,
There were only two bids on that meter; did you get a second chance offer on the same auction or was it a separate auction?
I want three of them also and I asked them the same question and I got directed to their Buy-it-Now auction with the same deal.
Regards,
Rob M.
Sydney, Australia
-----Original Message-----
From: Les Burt
I also won one of the same meters for a few pennies less. I tried to purchase 3 for the same low winning bid but the seller just re-
directed me to their Buy-it-now carrying a price of ~23$ delivered. Guess i'll have to bid one at a time to get them cheaper.
It will be interesting to see how accurate and reliable these units are. I'll compare readings with my BluePoint multi-meter to see
whats up. I've got 2 portable gensets with electric start that i want to install them on, as well as my coach.
Les
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Les Burt
Montreal
1975 Eleganza 26ft
A work in Progress
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| Re: [GMCnet] Installing a current transformer in a 30/50 amp system [message #238713 is a reply to message #238708] |
Mon, 03 February 2014 23:09 |
 |
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
|
|
Les,
What I'm about to write may make me sound cold but I like the fact that I don't know if I'm bidding against a friend.
Last week I noted that I won the switch pitch transmission and final drive for $91 which is a ridiculously cheap price for both
units. As it turned out JR Wright was the second bidder. Did that make me feel bad, yes and no. It made me feel bad because JR is a
great guy who also helps LOTS of people here. When we were at the Great Lakers Rally in Elkhart, he scoured the area looking for me
to take me to the surplus stores. On the other hand it's an auction and the highest bidder wins. Let's say if he or I had know who
the other bidder was and refrained from bidding only to have a third party that neither of us knew and out bid whoever kept bidding
we'd both be out of luck! It should be noted that I was the first bidder and I would assume that if one was to know that we were
bidding against a friend the first bidder would get to continue bidding. BTW after the auction was over JR contacted me and asked if
I would sell him the final drive. I told him that I had bought both units as spares because they are rarer than rocking horse poo.
However, I was considering purchasing a LSD from JimK and if I did I would give him the first right of refusal. If that makes me a
bad friend so be it.
Also eBay continues to hide the successful bidders ID except to the successful bidder:
http://offer.ebay.com/ws/eBayISAPI.dll?ViewBids&_trksid=p2047675.l2565&rt=nc&item=400645267826
Oh yeah, the reason I asked if the meter auction I won is because I intend to bid on two more of these and it would be stupid if
we're the only two bidding on them and we run each other up as that will benefit the Chinese seller.
How do you suggest we solve this conundrum?
Regards,
Rob M.
Sydney, Australia
-----Original Message-----
From: Les Burt
It was a separate auction. I may have been the second bidder on the item you won as i had bid on one and was outbid. I hate how eBay
has resorted to hiding the bidder ID until bidding is over. It makes it hard to avoid bidding against friends.
Les
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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] Installing a current transformer in a 30/50 amp system [message #238722 is a reply to message #238651] |
Tue, 04 February 2014 06:18 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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I did 22 years as a FANG in Air Farce shops. The slick-sleeves eyes got real big the first time they were showed how to make sure there's no high voltage lurking about. We always used the biggest cap we had, so it would produce enough bang to maintain the troop's interest.
--johnny
MSGT ret.
From: D C _Mac_ Macdonald <k2gkk@hotmail.com>
To: GMC Mail List <gmclist@temp.gmcnet.org>
Sent: Monday, February 3, 2014 5:10 PM
Subject: Re: [GMCnet] Installing a current transformer in a 30/50 amp system
The US Air Force electronic shops all had a "grounding stick" which was a dry, wooden cane (probably fiberglass now) that had a spike on the end and a large flat braid grounding conductor with large alligator clamp that you hooked to chassis ground. If the tech was working around ANY circuits that may have had high voltage on them (capacitors hold LOTS of charge), that device was used to get rid of any voltage. Made a hell of a lot of noise if there was high voltage present!
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
~~ ~ D C "Mac" Macdonald ~ ~~
~ ~ Amateur Radio - K2GKK ~ ~
~~ k2gkk @ hotmail dot com ~~
~ ~ USAF and FAA, Retired ~ ~
~ ~ ~ Oklahoma City, OK ~ ~ ~
~~ ~ ~ "The Money Pit" ~ ~ ~~
~ ~ ~ ex-Palm Beach, 76 ~ ~ ~
~~ k2gkk + hotmail dot com ~~
~ www.gmcmhphotos.com/okclb ~
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
______________
*[ ]~~~[][ ][|\
*--OO--[]---O-*
> Date: Mon, 3 Feb 2014 09:08:47 -0800
> From: ronaldpottol@gmail.com
> To: gmclist@temp.gmcnet.org
> Subject: Re: [GMCnet] Installing a current transformer in a 30/50 amp system
>
> A friend had that happen to him in the Navy, took 440v in one hand and out
> the other. He's still with us, and for someone with his temper, he seemed
> remarkably at ease with not seeking any retribution. It seems what the
> chiefs did was enough.
>
> ;-)
>
>
> On Mon, Feb 3, 2014 at 8:09 AM, Johnny Bridges <jhbridges@ymail.com> wrote:
>
> > A traveling engineer friend carries a single jumper cable about three feet
> > long, which he uses to jump across the spark gap on AM transmitting towers
> > before he works on the tuning units. Both ends are arced many times. He's
> > still with us. If it's over 48 volts, I lay a screwdriver across the
> > feed. My screwdriver is arced as well. Turn it off anf tag it and some
> > numbnuts will sometimes turn it back on anyway.
> >
> > ==johnny
> > '76 23' transmode norris
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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] Installing a current transformer in a 30/50 amp system [message #238724 is a reply to message #238713] |
Tue, 04 February 2014 08:26 |
GMC_LES
Messages: 569
Registered: October 2009
Location: Montreal
Karma: 0
|
Senior Member |
|
|
Rob,
I agree with your view, but there are times when I still like to know who i'm up against. In the past i have caught a few shill bidders and by reporting them, had them suspended or banned from eBay.
Regarding bidding on the meters, i'm not in a rush and will probably not buy another until i've received the first one.
My approach will be to only bid on a meter that has not received any bids, in the hopes that i am the only bidder. This way i have the chance of buying cheap, and not competing against another bidder. It might take some time to acquire the next 2 units though. Fortunately i saw that there were atleast 3 seller IDs offering the same or similar meter, so i plan on spreading out my bids.
Be careful on the meter you bid on. There are three different versions that i saw. Look for the position of the selector button as well as the V, A, Hz LEDs. The LEDs can be on either side of the display, and the button can be in the screen surface or in the bezel(housing). The specs appear to be the same for all the versions, so the differences are a minimal concern. I still would prefer to purchase identical units.
Les Burt
Montreal
1975 Eleganza 26ft
A work in Progress
On Feb 4, 2014, at 12:09 AM, "Robert Mueller" <robmueller@iinet.net.au> wrote:
Les,
What I'm about to write may make me sound cold but I like the fact that I don't know if I'm bidding against a friend.
Last week I noted that I won the switch pitch transmission and final drive for $91 which is a ridiculously cheap price for both
units. As it turned out JR Wright was the second bidder. Did that make me feel bad, yes and no. It made me feel bad because JR is a
great guy who also helps LOTS of people here. When we were at the Great Lakers Rally in Elkhart, he scoured the area looking for me
to take me to the surplus stores. On the other hand it's an auction and the highest bidder wins. Let's say if he or I had know who
the other bidder was and refrained from bidding only to have a third party that neither of us knew and out bid whoever kept bidding
we'd both be out of luck! It should be noted that I was the first bidder and I would assume that if one was to know that we were
bidding against a friend the first bidder would get to continue bidding. BTW after the auction was over JR contacted me and asked if
I would sell him the final drive. I told him that I had bought both units as spares because they are rarer than rocking horse poo.
However, I was considering purchasing a LSD from JimK and if I did I would give him the first right of refusal. If that makes me a
bad friend so be it.
Also eBay continues to hide the successful bidders ID except to the successful bidder:
http://offer.ebay.com/ws/eBayISAPI.dll?ViewBids&_trksid=p2047675.l2565&rt=nc&item=400645267826
Oh yeah, the reason I asked if the meter auction I won is because I intend to bid on two more of these and it would be stupid if
we're the only two bidding on them and we run each other up as that will benefit the Chinese seller.
How do you suggest we solve this conundrum?
Regards,
Rob M.
Sydney, Australia
-----Original Message-----
From: Les Burt
It was a separate auction. I may have been the second bidder on the item you won as i had bid on one and was outbid. I hate how eBay
has resorted to hiding the bidder ID until bidding is over. It makes it hard to avoid bidding against friends.
Les
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Les Burt
Montreal
1975 Eleganza 26ft
A work in Progress
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| Re: [GMCnet] Installing a current transformer in a 30/50 amp system [message #238729 is a reply to message #238615] |
Tue, 04 February 2014 09:08 |
GMC_LES
Messages: 569
Registered: October 2009
Location: Montreal
Karma: 0
|
Senior Member |
|
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John i like your suggestion. With the cheap eBay meters, one could monitor 2 Onan parameters simultaneously such as total Amps on one meter & either Volts or Hertz on the other. Of course if your system is set up and working properly you don't need to monitor it that precisely unless you need to diagnose a problem. Then you could use a VOM to do the job.
Les Burt
Montreal
1975 Eleganza 26ft
A work in Progress
On Feb 3, 2014, at 11:27 AM, John R. Lebetski <gransport@aol.com> wrote:
Dual element display. 3 pickup coils. Hot, Hot , Neutral. First Hot and Neutral feed first display via switch. Second Hot feeds second display only. On 240/ 120 plug in post 14-50 look at the 2 Hots. You can see both Hots for balance or flip the switch to see the Neutral. On Onan/30 dongle flip the switch to look at the Neutral for your total draw via display 1. JWIWD
--
John Lebetski
Chicago, IL
77 Eleganza II
Source America First
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Les Burt
Montreal
1975 Eleganza 26ft
A work in Progress
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| Re: [GMCnet] Installing a current transformer in a 30/50 amp system [message #238771 is a reply to message #238724] |
Tue, 04 February 2014 16:09 |
|
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
|
Senior Member |
|
|
Les,
OK, reading your message below has helped me figger out a solution to our "problem." Whoever finds the meter first and places a bid
will notify the other of doing so and the other won't bid.
I too will wait until I get the first meter before I bid again.
Thanks for the heads up on the differences in the meters.
From this point onwards I'm taking this OFF NET as it doesn't involve anyone except us.
Regards,
Rob M.
Sydney, Australia
-----Original Message-----
From: Les Burt
Rob,
I agree with your view, but there are times when I still like to know who i'm up against. In the past i have caught a few shill
bidders and by reporting them, had them suspended or banned from eBay.
Regarding bidding on the meters, i'm not in a rush and will probably not buy another until i've received the first one.
My approach will be to only bid on a meter that has not received any bids, in the hopes that i am the only bidder. This way i have
the chance of buying cheap, and not competing against another bidder. It might take some time to acquire the next 2 units though.
Fortunately i saw that there were atleast 3 seller IDs offering the same or similar meter, so i plan on spreading out my bids.
Be careful on the meter you bid on. There are three different versions that i saw. Look for the position of the selector button as
well as the V, A, Hz LEDs. The LEDs can be on either side of the display, and the button can be in the screen surface or in the
bezel(housing). The specs appear to be the same for all the versions, so the differences are a minimal concern. I still would prefer
to purchase identical units.
Les
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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: Installing a current transformer in a 30/50 amp system [message #238982 is a reply to message #237865] |
Thu, 06 February 2014 12:53 |
kingd
Messages: 592
Registered: June 2004
Karma: 2
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Senior Member |
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Ken Burton, I know the Selectics with 50 Hz motors used a larger "pulley" on the motor than did the 60 Hz versions. We also built some model D typebar machines that we shipped to the USA. Do you know what a Chicago on ne cord was ? I always thought the story about Mrs. O'leary's cow was a urban legend. But not so.
DAVE KING
lurker, wannabe
Toronto, Ontario, Canada
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| Re: Installing a current transformer in a 30/50 amp system [message #238988 is a reply to message #238982] |
Thu, 06 February 2014 14:47 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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The "city of Chicago power cord" was an ordinance passed in Chicago to keep Mrs. O'leary's cow from getting her feet tangled in them, and to keep the electrical unions happy. It meant more work for the union electricians installing wall plugs, conduit, additional circuit breakers, etc. It also outlawed the use of extension cords. There are lot of Chicago unique electrical requirements for low voltage and no voltage circuits. We would pull coax and other signal type cable at night when no one was around to report us to the power cord police.
What a lot of companies would do was to order machines with a suburban address and then tell the trucking company to deliver them to a different address in Chicago. With all of the bloated government in Chicago we were surprised that the never hired any power cord / extension cord police to run around and enforce the law. They relied instead on Union members to report violations. They seldom reported it because it meant they would not be employed there again. It really was only applied to new equipment sold for delivery in the City limits of Chicago.
The "City of Chicago" power cord was simply a requirement that all power cords be 6 feet long.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Installing a current transformer in a 30/50 amp system [message #239884 is a reply to message #238417] |
Thu, 13 February 2014 16:14 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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G'day,
The meter showed up yesterday and there are no instructions in it. The current sensing coil is hard wired to the circuit board with
wires that are about 6 inches long.
The connections to the 12 VDC gage power and 120 - 240 VAC are about 10 inches long and the circuit board is labeled with their
function.
I found another one on eBay (item 171238277060) and have placed a bid on it.
Regards,
Rob M.
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Robert Mueller
Sent: Sunday, February 02, 2014 12:05 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Installing a current transformer in a 30/50 amp system
G'day,
I won this meter:
http://www.ebay.com/itm/310855695453?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649#ht_2541wt_988
When it shows up I'll post the installation instructions.
Regards,
Rob M.
Sydney, Australia
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GMCnet mailing list
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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] Installing a current transformer in a 30/50 amp system [message #239918 is a reply to message #239884] |
Thu, 13 February 2014 18:35 |
GMC_LES
Messages: 569
Registered: October 2009
Location: Montreal
Karma: 0
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Senior Member |
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Mine should arrive soon then. I plan to temporarily wire it into my sub-panel in my garage so I can subject it to some decent and varied loads while comparing the results against my amprobe. I'll post my results.
Les Burt
Montreal
1975 Eleganza 26ft
A work in Progress
On Feb 13, 2014, at 5:14 PM, "Robert Mueller" <robmueller@iinet.net.au> wrote:
G'day,
The meter showed up yesterday and there are no instructions in it. The current sensing coil is hard wired to the circuit board with
wires that are about 6 inches long.
The connections to the 12 VDC gage power and 120 - 240 VAC are about 10 inches long and the circuit board is labeled with their
function.
I found another one on eBay (item 171238277060) and have placed a bid on it.
Regards,
Rob M.
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Robert Mueller
Sent: Sunday, February 02, 2014 12:05 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Installing a current transformer in a 30/50 amp system
G'day,
I won this meter:
http://www.ebay.com/itm/310855695453?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649#ht_2541wt_988
When it shows up I'll post the installation instructions.
Regards,
Rob M.
Sydney, Australia
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Les Burt
Montreal
1975 Eleganza 26ft
A work in Progress
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| Re: [GMCnet] Installing a current transformer in a 30/50 amp system [message #246424 is a reply to message #239884] |
Fri, 04 April 2014 21:54 |
GMC_LES
Messages: 569
Registered: October 2009
Location: Montreal
Karma: 0
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Senior Member |
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Bringing this topic back fron the dead because I finally got around to testing the chinese LED volt/amp/Hz meters mentioned here. I had purchased a total of 3 identical units. Hooked all 3 of them up to the same load and compared readings with my Snap-On digital VOM.
Super precise they are not, but for what our intended uses will be, they are perfect. I found the Hz reading to be dead accurate at the 60hz my power company provides. I have no convenient way of varying the frequency without getting complicated, so i do not know if precision is as good at 50Hz. When testing at 240v, the reading was about 2-3 volts high and at 120v they read 1-2 volts high. One of the 3 units read way off on the volt scale. After examining the back side of that unit, i found several resistors that had been bent over during packaging. After straightening them up, the reading was inline with the other units. For amperage readings all three were within 0.5a at all times, but none of them ever read exactly the same at any time. I tested them at 11a, 20a, 31a, 40a, & 51a loads with similar results each time. Regarding the high volt reading, a few volts either side of spec is not a problem for most appliances, so i'm not concerned.
So for what they cost, they are a fantastic little meter for informing us of our AC power status. I will be installing one in my coach, one on my portable genset. And one as a spare. I have even considered putting one next to my house electric panel as a quick reference, but i have never experienced any out of spec electricity delivery, so do not know if I will bother.
Les Burt
Montreal
1975 Eleganza 26ft
A work in Progress
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