Ground Fault Setting

[Askarel27]

In any electrical code, is their a limit that the setting of a ground fault protector to be maximum say t(s)= 1.0 and I(g)= 1.0 . Is their any calculation? The breaker rating is 150A.
see attached. Our inspection is asking a setting calculation.

 

[waross]

Arc flash calculation??
Common sense and good practice dictate that in an impedance grounded system your setting must be lower than the calculated ground current.

Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[wbd]

It would also have to be coordinated with any ground fault settings upstream from this device.

The ground fault settings have no effect on arc flash calculations as arc flash calculations are considered 3 phase. The exception to that is in utility type situations (overhead lines) where the arc flash is predominately single phase, open air type faults.

 

[dpc]

In the US, ground fault protection provided in low voltage systems has maximum settings as dictated by UL and the NEC. These maximum settings are inherent in the device.

 

[Mbrooke]

It all depends one what is trying to be accomplished. What is the intended purpose of having ground fault protection?