Is it a code that when landing a 3/4 flex connector into a disconnect( useing concentric K.O.'s) for a heat pump that requires #6alum (10 grnd) that you use a bond bushing or a grounding locknut. I thought that this was true only for the line side of a service. Thanks for any advice.
Concentric K.O.'s
- Thread starter nathan
- Start date
- Status
- Location
- Bremerton, Washington
- Occupation
- Master Electrician
Re: Concentric K.O.'s
Assured bonding at concentric KO's is required for unfused service entrance conductors and for circuits over 250 volts to ground.
However, the flex conduit must be fastened within 12" of the connector and this is not often done.
Assured bonding at concentric KO's is required for unfused service entrance conductors and for circuits over 250 volts to ground.
However, the flex conduit must be fastened within 12" of the connector and this is not often done.
Re: Concentric K.O.'s
Ok Tom I kinda understand what your saying...problem is I work with somebody who is telling me it is a code....he cannot find it. I have tried myself and am unable this would normally tell me not to worry about it but I just had a funny feeling I should get a second opinion...do you know of such a code for the earlier stated application???
Ok Tom I kinda understand what your saying...problem is I work with somebody who is telling me it is a code....he cannot find it. I have tried myself and am unable this would normally tell me not to worry about it but I just had a funny feeling I should get a second opinion...do you know of such a code for the earlier stated application???
al hildenbrand
Senior Member
- Location
- Minnesota
- Occupation
- Electrical Contractor, Electrical Consultant, Electrical Engineer
Re: Concentric K.O.'s
Nathan,
What is the voltage to ground for this branch circuit? Also, what is the aggregate length of flex from the heat pump to the branch circuit overcurrent protection?
Nathan,
What is the voltage to ground for this branch circuit? Also, what is the aggregate length of flex from the heat pump to the branch circuit overcurrent protection?
- Location
- Massachusetts
Re: Concentric K.O.'s
Nathan, with the info you provide it is not a yes or no answer.
2002 NEC 250.97 requires bonding on circuits over 250 volts to ground, but there are exceptions to this.
It would be better if you read them yourself to see where your particular installation fits in, or provide more info.
You also could look at 250.118(7) which has a 6' maximum total length for using the flex as the grounding conductor.
It sounds like you ran a separate equipment grounding conductor, so in my opinion 250.118 does not apply.
I believe if you run an equipment grounding conductor and the voltage to ground is less than 250 volts you do not need bonding bushings for the flex that could be as long as you want.
Above 250 volts to ground you will need bonding bushings, unless your installation fits the exceptions.
[ May 30, 2003, 06:13 AM: Message edited by: iwire ]
Nathan, with the info you provide it is not a yes or no answer.
2002 NEC 250.97 requires bonding on circuits over 250 volts to ground, but there are exceptions to this.
It would be better if you read them yourself to see where your particular installation fits in, or provide more info.
You also could look at 250.118(7) which has a 6' maximum total length for using the flex as the grounding conductor.
It sounds like you ran a separate equipment grounding conductor, so in my opinion 250.118 does not apply.
I believe if you run an equipment grounding conductor and the voltage to ground is less than 250 volts you do not need bonding bushings for the flex that could be as long as you want.
Above 250 volts to ground you will need bonding bushings, unless your installation fits the exceptions.
[ May 30, 2003, 06:13 AM: Message edited by: iwire ]
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