t-smith wrote:
Ok did some reading and taking. When no load, hot/neutral and hot/ground should read same. When load, hot/neutral may be less and hot/ground will stay the same - otherwise ground fault. Nuetral / ground will read voltage diff of the 2. So, basically the load diff.
So, everything checks out and wiring is indeed all good. Inverter just decided to not play nice with gfi, which seems very common with RVs
Sam Spade wrote:
JWRoberts wrote:
Voltage measurements will not help you diagnose this problem.
It will if there is a voltage difference between the neutral and ground. That pretty much is the definition of a ground fault.
JWRoberts is correct - Let's correct the misinformation on how GFCI's work.
THEY DO NOT DETECT A VOLTAGE DIFFERENCE.GFCI's detect the
CURRENT DIFFERENCE between the hot and neutral.
A voltage drop between the ground and neutral is common and expected when there is any load on the circuit. Simple example: There is 120V at the service panel and at the plug with a load there is 115V. That's because there is a 2.5V drop on the hot wire and a 2.5V drop on the neutral wire. Ground to neutral will read 2.5V and ground to hot will read 117.5V at the plug.
Inside of a GFCI both the hot and neutral pass through a differential current transformer and when the current difference exceeds 5mA the circuitry will trip the GFCI.
