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 > Electrical issue on 50amp service

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dougrainer

Carrolton, Texas

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Posted: 11/01/21 11:38am Link  |  Quote  |  Print  |  Notify Moderator

WASTATELIVING wrote:

Thanks Doug,

I said home to make it easy. We are staying at a friends home and have been for 2.5 months now. No issues what so ever until just a few nights ago. Which makes me think that its not a problem at the source. I can clarify that on the power cord I've got 120v on EACH leg.


Measure the voltage across EACH leg. It should be 240 volts. Report back. 2 probe wires. 1 goes into the 1 leg the 2nd goes to the other leg. Voltage you have made. Neutral to each leg or Ground to each leg? Doug

Dutch_12078

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Posted: 11/01/21 11:42am Link  |  Quote  |  Print  |  Notify Moderator

dougrainer wrote:



PS, I have 42 years as a RV tech and one thing I have learned over those years is that even LICENSED ELECTRICIANS, have problems understanding 30 and 50 amp RV plugs.


If the electrician doesn't understand how to wire a NEMA 14-50R for a 50 amp RV, find another electrician. The wiring is identical to the NEMA 14-50R for a residential range.

30 amp is a different story. For some reason some electricians can't read the "120-volts" label on a NEMA TT-30R outlet and confuse it with wiring the "120/240-volts" NEMA 14-30 outlet, or the "240-volts" NEMA 10-30 outlet used by older dryers.


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pianotuna

Regina, SK, Canada

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Posted: 11/01/21 02:38pm Link  |  Quote  |  Print  |  Notify Moderator

Test the voltage to the transfer switch. Then test the voltage after the transfer switch.

I refuse to have a transfer switch. I use manual plugs instead.


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp-hours of Telcom jars, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

wa8yxm

Davison Michigan (East of Flint)

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Posted: 11/01/21 02:42pm Link  |  Quote  |  Print  |  Notify Moderator

I will describe two issues and the likely culprits
One: You have 240 volts hot to hot and 120 l=hot to neutral (eitehr side) no load but when you turn things one. especially Heave eaters like the water heater or my lady's hair dryer or the nicrowave or one A/C the voltage on that leg goes DOWN and the other UP.. (Note a volt or two is not a problem 10 volts is) Open or high resistance NEUTRAL.

Your problem.. one leg stays at 120 and the other drops like a rock under load

Proglem high resistance that leg or way too much load

True story (Mine) When my rig was new sometimes one A/C worked, sometimes the other both or neither.. So i started tribble hunting (I'm a certified electronics tech) First stop was the breaker box (power distribution panel) also as it turns out, the last stop.

one of the screws holding the wires took over 3 full turns before I was happy. oh, yes once all (And I tightened every screw that turned) (UNPLUG FIRST) everything worked fine.

Other locations: The plug (Shore cord) Outlet (Shore cord) Inlet (RV) I had a loose screw on the inlet too.

Fellow RVer plugged his brand new sticker still in window 5er in and NO POWER.

Grabbed ye old multi meter (did not need it) and started diagnosis.. Shore cord outlet (The end that plugs into RV is called the outlet The "Socket" on the RV is actually an INLET (Plug) Fell off in my hand

The thing has 9 screws, 3 that hold the shell together and 6 that clamp the wires and cable. not one of those six had been tightened.

I've have loved to be there when the owner returned to the dealer for a "Chat".

Oh. I told him how much to bill (150/hr minimum 1 hr minimum) Though I did not bill (Fellow RVer after all)


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larry cad

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Posted: 11/02/21 02:28am Link  |  Quote  |  Print  |  Notify Moderator

vermilye wrote:

Check all the neutral connections. A loose or open neutral can cause different voltages between legs.



This is your problem. 70 volts almost always means an open neutral connection.


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wa8yxm

Davison Michigan (East of Flint)

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Posted: 11/02/21 05:32am Link  |  Quote  |  Print  |  Notify Moderator

larry cad wrote:

vermilye wrote:

Check all the neutral connections. A loose or open neutral can cause different voltages between legs.



This is your problem. 70 volts almost always means an open neutral connection.


I would agree with you Larry if the other leg was not still showing 120 with an open neutral if one leg is 70 the other should be 170 so the total is 240..

This is why I think it's the low voltage leg that has a screw loose.

curt12914

Bombay NY (5 miles from Quebec, 15 from Ontario)

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Posted: 11/02/21 05:59am Link  |  Quote  |  Print  |  Notify Moderator

Have you tried unplugging and connecting (temporarily) through a 50 amp to 30 amp adaptor?
If you have power on both legs with the adaptor, you can narrow it down to a problem before it gets to the plug.
If you still have the problem with the adaptor, your problem is either in your power supply cord or in the RV.


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WASTATELIVING

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Posted: 11/02/21 04:11pm Link  |  Quote  |  Print  |  Notify Moderator

thank you all for your suggestions. It took me a bit to reply as I got off work finally this morning but we did find the issue. After checking all breakers, all connections, trouble shooting the inverter and separately testing each power cord and even hooking up to a generator the simple issue was a loose N and one of the Hot legs was also loose in the receiving plug on the exterior wall of the rv. ridiculous.

Thanks again for all your input, helped me believe I was on the right track.

Until next time,
Dre

Cummins12V98

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Posted: 11/02/21 04:55pm Link  |  Quote  |  Print  |  Notify Moderator

Great you found it!


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wa8yxm

Davison Michigan (East of Flint)

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Posted: 11/03/21 03:40pm Link  |  Quote  |  Print  |  Notify Moderator

Yup. Just like me.. You HAD a screw or two loose. one of the same ones in fact.

Had weak (not open) Neutral at my house by the way.. That was fun. (NOT!!)

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