ATS wiring
bought this and an inverter from Best Converter: clicky I'm not clear on how to wire it. I have 50 amp 4 wire service and a 2,000 watt 3 wire inverter. My thinking is the circuit where the inver...
Forum Discussion
shastagary wrote:
the ground wires should not ever be switched through the transfer switch.
the ground terminal on your shore cord is extra long it makes the ground connection first when you plug it in you do not want any interruption of that through the transfer switch. all grounds go directly to the silver ground bus only.
i would put a jumper between the aux and neutral connection on the shore input and leave the same jumper on the control panel output that way the now 2 neutral contacts can handle the full 100amps of the shore power cord. 50amps from L1 and 50amps from L2.
Since the two legs are 180 degrees out of phase from shore power, the neutral only carries the differential current, which is never more than a nominal 50A. If both legs are loaded fully, they're balanced and there is no neutral current. This also makes it possible to have 240V loads, though such are quite rare in most RVs.
(The NEC does also permit the two legs to be 120 degrees out of phase, as in two of the three legs of a three phase Y system, but that is very rare in practice for campground power systems and as the differential currents still partly offset so the maximum neutral current is still 50A. A range outlet in an apartment complex would be more likely to be on a three-phase system and so have this setup.)
The time when you'd see more than 50A on the neutral is with some RV generators (ones larger than 6 kVA) that are set up for 120V operation with two parallel breakers feeding the two legs.
