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Bus Discussion => Bus Topics ( click here for quick start! ) => Topic started by: Bob Gil on August 10, 2008, 12:33:53 PM

Title: Shore power question
Post by: Bob Gil on August 10, 2008, 12:33:53 PM
I am in a bit of a tight and need to know can I wire the shore plug to work on the dryer plug from my house? 
It is 220 but i don't know a lot about electricty. 

Just that the kitchen is not working in the house for a while and I would like to be able to cook in the bus with out having to run the genset the whole time I am cooking.
Title: Re: Shore power question
Post by: Busted Knuckle on August 10, 2008, 12:37:46 PM
should be able to, but please don't take my word for it! The guru's will be a long and answer the properly soon! ;D  BK  ;D
Title: Re: Shore power question
Post by: HighTechRedneck on August 10, 2008, 12:51:23 PM
Yes, you can easily build an adapter (Range outlet wired to a Dryer Plug using 6 gauge wire).  But the important thing to note is the rating of the breaker on the dryer circuit and keep your usage within that.  Dryers don't draw as much power as Ranges can.  That is the reason for the different plug.  IIRC a dryer circuit is 30 amps on each leg as opposed to a range circuit being 50 amps on each leg.  Hence they are built with lighter gauge wire.

hth

Title: Re: Shore power question
Post by: Bob Gil on August 10, 2008, 12:56:25 PM
I will just need some thing to run the convection oven microwave and maybe the one burner stove top.

The smoke got out of the kitchen wiring and the oven and stove top too it looks like.

Some days it just does not pay to get up.
Title: Re: Shore power question
Post by: HighTechRedneck on August 10, 2008, 01:15:50 PM
That connection shoudl be fine for those two things.
Title: Re: Shore power question
Post by: bobofthenorth on August 10, 2008, 01:18:22 PM
Sorry to burst your bubble Bob but there's no way to do what you want without violating code.  The problem is that your dryer has 2 hot plugs and a neutral safety.  You should read 120 volts from each of the hot plugs to the neutral safety and 240 volts across the hots.  But you can't use the neutral safety to carry the ground.  If it was me & I really "had" to use the dryer plug, I'd get a 10' ground rod and drive it into the ground near the plug and use that for my ground but don't tell anybody I said that.  And if you don't know what I mean then its a good sign that you shouldn't be messing with it.  By your own words you've already got escaped smoke on your hands - no sense making more of it.
Title: Re: Shore power question
Post by: Bob Gil on August 10, 2008, 01:25:59 PM
Quote from: bobofthenorth on August 10, 2008, 01:18:22 PM
Sorry to burst your bubble Bob but there's no way to do what you want without violating code.  The problem is that your dryer has 2 hot plugs and a neutral safety.  You should read 120 volts from each of the hot plugs to the neutral safety and 240 volts across the hots.  But you can't use the neutral safety to carry the ground.  If it was me & I really "had" to use the dryer plug, I'd get a 10' ground rod and drive it into the ground near the plug and use that for my ground but don't tell anybody I said that.  And if you don't know what I mean then its a good sign that you shouldn't be messing with it.  By your own words you've already got escaped smoke on your hands - no sense making more of it.


I don't trust the wiring on the buss or me so I already have a rod in the ground with a #6 copper wire going to it from the frame of the buss just to make sure if there is not a good round I will be covered I hope.  And i have not got any thing pluged into it just two extention cords going to it.  I don't wnat one of them to short out on the bus if it gets pulled to hard or some thing and making the bus electfied.
Title: Re: Shore power question
Post by: HighTechRedneck on August 10, 2008, 01:31:42 PM
Bob's right it won't meet code if done that way.  On the other hand a 50' extension cord running from inside the house to the outside probably doesn't meet code either.

Since Neutral and Ground are generally bonded in a home installation, there are basically two wires going to the same place.  One as the official path, the other as a safety backup.  In this scenario, you are foregoing the safety back up.  You could put in a ground wire to attach to the adapter if you like.
Title: Re: Shore power question
Post by: JackConrad on August 10, 2008, 02:01:57 PM
Before you plug in anything in your bus, check your wiring to be sure you have 120 volt and not 240 volt.. 2 40 would quickly let the smoke out in your bus.  Better safe than sorry.  Jack
Title: Re: Shore power question
Post by: Sojourner on August 10, 2008, 02:33:40 PM
Amen to bobofthenorth and Jack Conrad!
I was about to warn that 2 hot 110/115v ac lines maybe 180° out of phase to make it 220/ 230v. If it not 220/230v, then it is 110/115v system.

Thank you for getting that out quick before a possible smoke and/or fire.

Sojourn for Christ, Jerry
Title: Re: Shore power question
Post by: bobofthenorth on August 10, 2008, 02:49:56 PM
Quote from: Bob Gil on August 10, 2008, 01:25:59 PM
I don't trust the wiring on the buss or me so I already have a rod in the ground with a #6 copper wire going to it from the frame of the buss just to make sure if there is not a good round I will be covered I hope.  And i have not got any thing pluged into it just two extention cords going to it.  I don't wnat one of them to short out on the bus if it gets pulled to hard or some thing and making the bus electfied.

Sorry but that won't help.  I think its time to call a local electrician.
Title: Re: Shore power question
Post by: HighTechRedneck on August 10, 2008, 03:30:14 PM
Quote from: Sojourner on August 10, 2008, 02:33:40 PM
Amen to bobofthenorth and Jack Conrad!
I was about to warn that 2 hot 110/115v ac lines maybe 180° out of phase to make it 220/ 230v. If it not 220/230v, then it is 110/115v system.

Thank you for getting that out quick before a possible smoke and/or fire.

Sojourn for Christ, Jerry


A standard dryer outlet is 220/240.  Two legs of 110/120 relative to neutral, 220/240 relative to each other.

Found a couple of pics to help clarify on an electrical forum.
Title: Re: Shore power question
Post by: Sojourner on August 10, 2008, 05:45:19 PM
Very Good...HighTechRedneck!

A picture with labels saves the confused.

Thanks

Sojourn for Christ, Jerry
Title: Re: Shore power question
Post by: belfert on August 11, 2008, 10:09:11 AM
The NEC now requires four wire outlets for dryers.  Bob's house may certainly still have a three wire outlet.

Everything I have ever been told about three wire 220 volt dryer outlets is that the third wire is the ground, not the neutral!  220 volt circuits have two hots and a ground, no neutral.

New dryer outlets have a neutral for the 110 volt parts of the dryer.  In the old days with the three wire outlets the ground was used as the neutral for anything needing 110 volts.
Title: Re: Shore power question
Post by: kingfa39 on August 11, 2008, 10:41:26 AM
since you say you dont know much about electricity id get a electrician and have him hook you up a outlet out of your elec panel, hooking up to the dryer outlet is not a good way to do this, not only out of code but could be dangerous as well. sometimes it pays to get someone profesinal on the job
Frank Allen
Title: Re: Shore power question
Post by: Nick Badame Refrig/ACC on August 11, 2008, 11:48:31 AM
Hi Bob,

If your bus is wired for 50amps, then you need the "Nutral" position in your feed. Not just the outlet.

Your nutral is there to ballance the load between both legs.

Some more scamatics here
http://www.busconversions.com/bbs/index.php?topic=5097.0

Good Luck
Nick-
Title: Re: Shore power question
Post by: Bob Gil on August 11, 2008, 01:02:38 PM
Wow did i open up a can of worms again.

I was thinking that the 30 amp pulg adapter i have only has 3 wires and the dryer plug has 3 they would be some what compatable now i understand that I can't run the 4 wire system off of a 3 system.  I better throw that adpter away before i mess some thing up.  I wonder why they make them if they are so dangerous.

I guess the wife is about right I should trade this bus for a pickup and go back the the AVION.
Title: Re: Shore power question
Post by: Sojourner on August 11, 2008, 02:48:13 PM
Quote from: Bob Gil on August 11, 2008, 01:02:38 PM
Wow did i open up a can of worms again.

I was thinking that the 30 amp pulg adapter i have only has 3 wires and the dryer plug has 3 they would be some what compatable now i understand that I can't run the 4 wire system off of a 3 system.  I better throw that adpter away before i mess some thing up.  I wonder why they make them if they are so dangerous.

I guess the wife is about right I should trade this bus for a pickup and go back the the AVION.

Bob...your case, you are running 220/230 set-up...not like what some others RV'er is using same plug configuration with both same phase 110/115 lines. In other words, Line1 and line2 (180° out of phase) 220/230v or Line1 and Line1 (same phase) combine into 110/115v but more available ampere.

Yours is the normal Line1 and Line2 for 220/230v power.

Only danger is if anyone has a RV using Line1/Line1 and plug into 220/230v power source or pole wills results a possible smoke and/or fire if RV is set-up internally to make it happen.

You should be OK except with Ground fault interrupters set-up that need the forth wire.

FWIW

Sojourn for Christ, Jerry
Title: Re: Shore power question
Post by: JackConrad on August 11, 2008, 03:37:12 PM
I replaced an inverter for a friend that has a MC-9. He plugged his 30 amp cord into his niece's dryer outlet. He instantly let all the smoke out of his inverter.  Just be careful and be sure to check voltage at the bus with a meter before plugging anything in.  Jack
Title: Re: Shore power question
Post by: HighTechRedneck on August 11, 2008, 04:20:05 PM
Definitely DO NOT plug a 30 amp RV Plug into a dryer outlet.  They are not the same thing.

It shouldn't go in anyway if the dryer outlet is using the correct 3 prong outlet.  Notice in the photo that the third prong is an "L" shaped prong, not an round/flat like on the 30 amp RV plug.

Since it sounds like the third prong of the dryer outlet could potentially be going directly to ground rather than bonded to neutral at the distribution panel, I fully agree that an electrician should probably do this. 

Or for what you're trying to do, just use two 12 gauge contractor cords.  Plug them into house outlets on different circuits.  Run one cord directly to the microwave and the other directly to the one burner cooktop.
Title: Re: Shore power question
Post by: niles500 on August 11, 2008, 05:14:09 PM
I'm with HTR - you shouldn't be able to plug a 120v/30amp pigtail into a 220v dryer plug of any type - FWIW
Title: Re: Shore power question
Post by: bigjohnkub on August 11, 2008, 06:15:11 PM
Hey Bob,  is there a 100 v air conditioner plug in your home. The local Harbor Freight store has 8 ga and 6 gauge extension cords. Check your circuit breaker panel and see if there is a 30 amp breaker. Normally these are on dedicated circuits. Turn it off and see what goes off, if not marked. That circuit would give you enough power to run bus. call me if you need to. Big John