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Old 01-01-2015, 12:01 PM   #1
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Transfer switch failed

I was helping a friend who apparently had a bad transfer switch. He bought a new TRC 40100. He connected shore power to a welding cable which has 220 v from hot leg to hot leg and 120 v to neutral...this ended up being 220v to neutral at the shore power terminals of the transfer sw.
(DO NOT HOOK TO UNKNOWN WELDING POWER CABLE!) After a couple of minutes of being energized, the relay dropped out. The 220v either burnt up the relay or damaged the printed ckt. bd.. The TRC does not furnish a schematic so I cannot trace the problem to pcb or relay coil. help schematic? relay coil terminals? pc board layout components? ideas?
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Old 01-01-2015, 01:06 PM   #2
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Normally a 50 amp RV outlet won't overload the neutral because the two 50 amp legs are 180º out of phase, so at any one instant there's never more than 50 amps from either leg. RV service also would only put that 50 amps into the neutral wire if one or both 50 amp legs were drawing their capacity amperage, which would require turning on every electrical device in the RV plus adding hair dryers, space heaters, etc.

You are correct in warning no to plug in to a power source for a welder, also a dryer or electric range outlet. In addition, your buddies actions speaks to the need of an EMS to protect the components of the RV from connection to faulty power.

I would hope TRC will repair or replace the unit, but fear since it was not a bad unit but bad power due to owner's error he might be out of luck.

I recommend you suggest a Progressive Industries EMS, they are guaranteed repair or replace for life and it would prevent damage from plugging in to a bad power source.

EMS-HW50C
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