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Old 10-18-2009, 07:44 AM   #15
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Sorry to hear about your problems. It could have been caused by an open neutral probably in the shorepower.

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Old 10-18-2009, 05:10 PM   #16
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No sure if this is still the case, but the manual for my 2001 Alfa 5th wheel has an insert with a warning to always turn off the circuit breakers on 50 amp service before plugging or un-plugging the cord.

Apparently the 50 amp connector design was such that it was possible to contact the two "hot" wires (230 volts across them) before the neutral made contact, with a possible voltage surge. It actually happened to mine (an electrician who wasn't aware of this was doing some work at the pedestal) with my home theater and the air bed pump suffering damage.

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Old 10-18-2009, 05:38 PM   #17
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In case you missed it check this link to Surge Protectors a much needed item.
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Old 10-19-2009, 07:29 AM   #18
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Switching off the breakers before connecting is always a good idea. For one, if there is a load turned on the plug contacts can arc when the plug is installed and that's hard on the outlet. Secondly, connecting the two hots without the neutral can also blow things in the coach. Some plugs are designed with a taller neutral blade so that it makes contact before the hot blades do. But, all it takes is a bit of a wiggle when putting the plug in to bypass that safety feature. The best thing is to have a surge suppressor, like the Progressive EMS 50C-HW or similar unit. A good surge protector will test the voltage levels first before energizing the system. That delay ensures that no hot phases can be connected before the neutral pin makes connection. I'd still keep the breaker off though when inserting or removing the plug.
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Old 10-19-2009, 09:07 AM   #19
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Very nice tutorial Cruzer.. Thanks

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