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garage panel
- Thread starter relbas
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izak
Senior Member
- Location
- Springfield, MO
Re: garage panel
no.
pull a #10 ground wire from the last panel and seperate the grounds and 'neutrals'
no.
pull a #10 ground wire from the last panel and seperate the grounds and 'neutrals'
Re: garage panel
If this sub panel has breakers or fuses, then it is fed with a feeder and not a branch circuit. If this garage is detached, then a ground electrode system is required when fed by a feeder. You don't have to pull a #10 grounding wire as long as there are no grounded metal paths between the garage and house.
If this is an attached garage, you're missing an equipment grounding wire (its not optional in this case), but no ground electrode system would be required.
If this sub panel has breakers or fuses, then it is fed with a feeder and not a branch circuit. If this garage is detached, then a ground electrode system is required when fed by a feeder. You don't have to pull a #10 grounding wire as long as there are no grounded metal paths between the garage and house.
If this is an attached garage, you're missing an equipment grounding wire (its not optional in this case), but no ground electrode system would be required.
bphgravity
Senior Member
- Location
- Florida
Re: garage panel
See section 250.32 of the NEC. Since you have installed a metal raceway to the strcuture, you are required to have an equipment ground. The IMC can serve for this purpose per 250.118.
The structure is required to have its own grounding electrode system in accordance with Part III of Article 250. There is no issue with parallel return current. The normal operating current will only flow on the insulated parts of the circuits.
See section 250.32 of the NEC. Since you have installed a metal raceway to the strcuture, you are required to have an equipment ground. The IMC can serve for this purpose per 250.118.
The structure is required to have its own grounding electrode system in accordance with Part III of Article 250. There is no issue with parallel return current. The normal operating current will only flow on the insulated parts of the circuits.
bphgravity
Senior Member
- Location
- Florida
Re: garage panel
Parralell fault current isn't an issue if you have at least one effective fault path. As a matter of fact, multiple paths help decrease the potential of exceeding a conductors withstand rating. There will always be multiple fault paths.
[ October 06, 2005, 11:52 AM: Message edited by: bphgravity ]
Parralell fault current isn't an issue if you have at least one effective fault path. As a matter of fact, multiple paths help decrease the potential of exceeding a conductors withstand rating. There will always be multiple fault paths.
[ October 06, 2005, 11:52 AM: Message edited by: bphgravity ]
james wuebker
Senior Member
- Location
- Iowa
Re: garage panel
Even if the pipe is metal or in PVC you should always pull a ground wire with it from your main panel to a sub panel. If your neutral ever was open you have you grounding wire for a fault if a fault did happen. If you didn't have a grounding wire pulled and the main sub panel neutral open a ground fault wouldn't trip the breaker.
Jim
Even if the pipe is metal or in PVC you should always pull a ground wire with it from your main panel to a sub panel. If your neutral ever was open you have you grounding wire for a fault if a fault did happen. If you didn't have a grounding wire pulled and the main sub panel neutral open a ground fault wouldn't trip the breaker.
Jim
greeny
Member
- Location
- Southern NH
Re: garage panel
It's the grounded circuit conductor that we want to avoid parallel return currents. This is why we don't bond the grounded circuit conductor to the electrode and EGC in a detached garage if there is a conductive path between the house and garage. If we did, then current would flow both on the neutral and the other electrically conductive path(s).
It's the grounded circuit conductor that we want to avoid parallel return currents. This is why we don't bond the grounded circuit conductor to the electrode and EGC in a detached garage if there is a conductive path between the house and garage. If we did, then current would flow both on the neutral and the other electrically conductive path(s).
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