I had my forman tell me that, for example, if you have a 12*12 box with ten conduits passing straight through, you would not have to terminate each equipment grounding conduit and bond each to the box. He said just one would due. Is this true. I see 250-148a permits one or more. I thought there was a code section which states that all grounds in metal boxes must be spliced together. However, it seems to me to have a terminal strip for ten grounds in a 12*12 is overkill. thank you
Under the 2002 code, if the EGCs are not spliced or terminated in the box, you don't have to connect any of them to the box. This is assuming that you are using a metallic conduit. In the 1999 code all of the EGCs must be joined together and a connection from the EGCs to the box must be made. You have the correct section, 250-148. Don(resqcapt19)
"a connection shall be made between the one or more equipment grounding conductors and a metal box by means of a ground screw that shall be used for no other purpose or a listed grounding device"
Now lets say that the job is spec'd out to have equipment grounding conductors in all conduits.
Back to the 12*12 box with 10 equipment grounding conductors inside. According to code one or more must be connected to the box. To me that implies all of them must terminate and be spliced together.
However, 250.148: limits the splicing of equipment grounding conductors only to those associated with circuit conductors that have been spliced. It reads: Where circuit conductors are spliced within a box, or terminated on equipment within a box, any separate equipment grounding conductors associated with those circuit conductors shall be spliced or joined within the box or to the box with devices suitable for the use.
As Don said, Unless the conductors are spliced in the box, you needn't terminate your grds. (this is a new thing in the '02) You might want to check out what version of NEC is applicable. You didn't mention the voltage. If it's >250 to ground, and that 12x12 came w/ concentrics, you'll have to bond them anyhow.