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Old 01-14-2012, 08:20 PM   #1
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Shore power problem

Shore power not working on 34 ft HR. Generator works fine. No power on load side of transfer switch.
Changed transfer switch with like. Simple hookup by experienced electrician.
Shore power applied to new transfer switch. and still no power . After a few minutes a small pop and smoke from transfer switch. Disconnected power from shore source. Generator still powers everything.
Is there an interlock or relay I am not seeing. It is my understanding that the transfer switch senses everything. 50 amp parallex switch with electronic sensing and coils.
Possible bad switch (new one)?

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Old 01-14-2012, 08:51 PM   #2
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Sounds like you have a problem with the input power. Check the 50amp outlet that you are plugging into to make SURE that you have 110vac on each side and the grounds are good.

Also sounds like you will need to replace the transfer switch again.

Ronnie (WD5GIC) & Jan (WD5IHU)
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Old 01-14-2012, 09:14 PM   #3
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The 50 amp cord has a factory made 30 amp adapter. Shore power is 240 volts with RV receptacle and is wired correctly.
Puzzling for sure.
New transfer switch on the way.
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Old 01-15-2012, 04:40 AM   #4
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Not sure of your coaches service but here is a link to a file that will help. iRV2 Forums - Files - RV Electrical Hook Ups 30 amp shore power will not be 230 volt but 120vac only. 50 amp shore power will be 120/240 vac. I would highly recommend a Surge Guard for your service on the coach. Hopefully it is not too late. Good luck, stay safe and keep us posted.
Mike, RVIA & RVSA Certified Master RV Technician
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Old 01-15-2012, 05:24 AM   #5
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Here is a good site that explains 30 and 50 amp RV power.

RV Electric
06 Hurricane 34FT WH W20 Chassis 8.1L 129K, Steersafe, Koni Shocks, DIY Trac Bar, Tri-Metric 2025RV Battery Monitor, 4-6V Batteries, Scan Gauge 2, Crossfires, 735W Solar Morningstar MPPT-60, KVH R5 In-Motion Sat, XM Radio, 07 Chevy Malibu Maxx Toad, Falcon 2, Brake Buddy, Escapee
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Old 01-15-2012, 11:32 AM   #6
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Is your HR a 50A or 30A wired rig?

If the power post has 240V measurement it indicates a 50A receptacle. Is the 50A cord connected to the power post then connected to a 30A adapter and then to a 30A coach?

Perhaps I did not read your description properly, but if I am correct you have too much power into the 30A adapter?
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Old 01-15-2012, 11:47 AM   #7
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Originally Posted by ronwaldrep View Post
The 50 amp cord has a factory made 30 amp adapter. Shore power is 240 volts with RV receptacle and is wired correctly.
Puzzling for sure.
New transfer switch on the way.

As stated previously, 30 A and 50 A are not compatible. No matter if 30 Amp adapter is "factory made". The recepticle in the pedistal, if it is wired correctly, wil only supply 122V on the 30 A configureation, and 244 on the 50 A side.
If someone tried to rewire what should have been a 244, 50 A plug, into a 30 A plug, you well could end up with your neutral being hot, very hot, to the tune of 122 volts. That will compromise all sorts of circuitry, some of which would be very expensive to replace.
Since you experienced the release of smoke....do not...simply replace the transfer switch, it will happen again. Since your generator is powering everything as per normal, it would seem that, that in itself would be a reliable indicator that wiring on the other side of the transfer switch is not right.
Experienced electrician or not, get another opinion, before you proceed. Under all the wrong conditions, your coach could have an energized frame, and all exposed metal parts, and, could concieveably be the source of a fire....
Play safe...seek out a qualified RV service tech that has extensive experience with these devices.

Back to a 5'er after 4 yrs fulltime.
Pulling with a '14 2500 ram, 6.4 Hemi.
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