Non grounded systems are bonded the same as grounded systems except a NG system does not have the main bonding jumper.
Review 250.4(A) for grounded and 250.4(B) for non grounded.
The reason for bonding NG systems is to prevent arcs from induced voltage from lightning.
Non grounded systems are bonded the same as grounded systems except a NG system does not have the main bonding jumper.
Review 250.4(A) for grounded and 250.4(B) for non grounded.
The reason for bonding NG systems is to prevent arcs from induced voltage from lightning.
Other than a non grounded system are all things bonded grounded?
I don't think so.
Tom, would you agree the bonding is also present to clear the ground fault ( open the OCPD ) if a second ,different, phase goes to ground in a different location ?
With a grounded system, if done properly how can they not be?Other than a non grounded system are all things bonded grounded?
In that case you may want to review Section 250.4(B)(1).I don't agree with lightning part.
Non grounded systems are bonded the same as grounded systems except a NG system does not have the main bonding jumper.
Review 250.4(A) for grounded and 250.4(B) for non grounded.
The reason for bonding NG systems is to prevent arcs from induced voltage from lightning.
Tom, would you agree the bonding is also present to clear the ground fault ( open the OCPD ) if a second ,different, phase goes to ground in a different location ?
I think these are the reasons for bonding an ungrounded system:
1. Allow ground detectors to work
2. Provide a low impedance path back to the source to trigger an OCPD for a second fault
3. lower the chance of touch potential and arcing from effects such as capacitance, inductance, and lighting induced surges
I agree with 1 and 2 but 3 I don't if the ground is not able to clear the fault how can it lower the chance of touch potential?