DARUSA
Senior Member
- Location
- New York City
Wich sise of wire I have to use to bond the steel frame of the building for a 7000amps service? I tought # 4 is the m?ximum size Wire required.Is it correct?.
You can also use a crimp on lug to the 3/0 wire and bolt the lug onto the beam with a bolt and nut.
Chris
250.66 is based on the CM of the service entrance wire that means I will have to runn a 3/0 wire.Another question is how can I terminate it to the Beam?
Is it a special connector for that?
250.66 is based on the CM of the service entrance wire that means I will have to runn a 3/0 wire.Another question is how can I terminate it to the Beam?
Is it a special connector for that?
The most common thing I have actually seen used is a beam clamp. I have always had my doubts about it being code though.
What about a mechanical lug bolted to the beam?
What about a mechanical lug bolted to the beam?
What about a mechanical lug bolted to the beam?
That will make three of us !!
Oh, what the heck: five! :roll:What about a mechanical lug bolted to the beam?
Of course you may use larger than #4 but you are only required to use a gec that is not larger than #4. For a 100 amp service you can use smaller but in no case are you required to run larger than #4.A #4 ithe minimum required for the concrete encased electrode,not maximum. To the best of my knowledge there is no maximum.
A #4 ithe minimum required for the concrete encased electrode,not maximum. To the best of my knowledge there is no maximum.
Won't get any argument from me on that one. Just telling you what I have seen used. For some people the extra couple minutes required to drill a hole for a lug is just too much.The problem that I have with beam clamps is the 250.8 requires the means used to attach the GEC to the electrode to be listed for the purpose and I have never seen a beam clamp that is listed for grounding.
Chris