| [GMCnet] You can't do Just One Thing [message #284334] |
Sat, 08 August 2015 19:48  |
glwgmc
Messages: 1014
Registered: June 2004
Karma: 10
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Senior Member |
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Hi Johnny,
Be careful in there. You my already be aware of this but the Onan generator only puts out 120VAC, not 220VAC, and the 50 amp shore power plug is wired to supply 120Vac to two different legs running down each side of your coach. It looks like a 220 plug, but is not so you can’t be sure it was wired to supply 120 VAC - and 120VAC + the way you are used to seeing in your home electrical panel. Ground and neutral are different in an RV than in your home as well. Since yours is a Norris, be sure you understand how they wired the AC side of things in your coach. Would not want to see a fried GMCer in GA (grin).
Jerry
Jerry & Sharon Work
Kerby, OR
glwork@mac.com
http://jerrywork.com
78 Royale with most everything done to modernize a GMC mechanically
77/94 Clasco bone stock and looks like it just left the Clasco facility
Both drive equally as well.
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Message: 9
Date: Sat, 08 Aug 2015 18:13:24 -0600
From: Johnny Bridges
To: gmclist@list.gmcnet.org
Subject: [GMCnet] You can't do Just One Thing
Message-ID:
Content-Type: text/plain; charset="utf-8"
Also called the Law of Unintended Consequences. I finished replacing the burnt switch and wires on the heat pump, and was going to return to the
cheeep genset install when I bumped the cabinet under the sink and everything hiccuped. Inspection showed the 40A breaker in the panel had eaten its
clip which plugs onto the bus in the panel, and was steadily working on toasting the breaker itself. So, I have done the wiring part of the new set
install first. Lowe's has a GE panel which has two buses (240v instead of the Bryant 120) and space four 8 thin breakers for less than 20 bux.
Breakers for it are less than $4 each. After which 10% off for being military. Out came the old panel, the water/A/C select switch, and some
unnecessary jumpers. The new setup will have two feeds, each 120V. When on genset, or shore, 240 would be available but I don't have anything which
needs it. 1 A/c on each leg, water heater on one leg and plugs on the other. Plugs on each side of the coach will now be on a seperate 20A breaker.
The biggest bite of the whole install is likely to be 50 feet of four conductor #6 for the shore feed. I'll also be looking for another 50 of it to
build up as an extention cord. My switching relay is double pole, I'll swap only the hots. It's rated 30A per pole which will work, in that '50 amp'
is actually 2 25s. I think I'll go ahead and hook my PD9160 12 volt supply in at the same time and remove the big brute force supply. I mounted the
GE panel upside down, the wires aren't long enough to make it work right side up.
--johnny
--
'76 23' transmode Norris upfit
Braselton, Ga.
"Sometimes I wonder what tomorrow's gonna bring when I think about my dirty life and times" --Warren Zevon
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Jerry & Sharon Work
78 Royale
Kerby, OR
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| Re: [GMCnet] You can't do Just One Thing [message #284350 is a reply to message #284334] |
Sat, 08 August 2015 22:05  |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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Jerry -
You missed a couple of posts. This coach never had an Onan in it. Norris had as far as I can tell the local electrician wire the coaches. All done in 12-2 with ground stapled down. I've no idea how it's attached where I can't see it. They used a cheap Bryan 110 panel, into which they put one 40 and two 20 amp breakers. They fed the forty from either the shore cable or genset, with a 30 amp double throw wall switch (which failed) which I replaced with a relay. Bless them, the feeds are home runs from the water heater, A/C, and outlets on each side of the coach. They fed the A/c and water heater off a double throw switch so you can have either one. The other runs were combined in a utility box beside the panel. Since the genset I'm installing is greater capacity than the original - double in fact - and 240 volt, I've put the A/C on one leg in the panel and the water heater on the other. The four home runs will be divided between sides. This keeps the microwave and icebox on separate legs. I'll put the second A/C on the water heater leg, and the new 12 volt supply on the other. This will balance the load fairly well. Whether the panel is fed by shore 50 amp or the genset doesn't matter - both provide a pair of 120V legs. They're out of phase on the genset since it's a 110-220 set. Whether they are on shore 50Amp pedestals doesn't matter, nothing in the coach sees both legs anyway. I picked up a dual 30 amp breaker to feed the panel, but I'm gonna take it back and pick up some more individual 20s. The genset has breakers on each leg, and shore pedestals do as well. I see no difference in how this is wired relative to my house, as far as the 110 goes. Neutral and ground are separate throughout, so a GFI feed won't be bothered if I encounter one.
This generator is a tiddler, 7KW. The ones we used at work, aside from the Onans on remote trucks ran from 30KW to 300KW from Onan or Kohler, and at one shared site we had a megawatt Cat plant. I had wanted an EMD for bragging rights, but the money wasn't right. A bud who worked offshore rigs told me later that the EMD plants didn't do real well in standby service, but were rocks when the were run fulltime.
Anyway, this setup ought to work. 7 heathen chinee KW from the generator or shore, and 60 amps of 12 volts ought to be asufficient.
--johnny
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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