bphgravity
Senior Member
- Location
- Florida
1. Section 250.53(A)
2. New Text
3. Add to the end of the end of the section: Where more than one rod or pipe electrode are used for the same system, the distance between electrodes shall not be less than the length of the longest rod or pipe and not exceed four times the length of the longest rod or pipe.
4. Substantiation: 1. I feel section 250.56 should be deleted completely. (proposal already provided for this) 2. The spacing requirements in this section only applies to rod, plate, and pipe electrodes installed to meet this section. There is no requirement for electrode spacing under any other purpose for the same system. 3. 250.53(B) spacing requirements only apply to electrodes of different systems. 4. One of the primary purposes of electrical system grounding is to limit the voltage imposed by lightning as indicated in 250.4(A)(1). Per the NFPA 780 section A.4.13.2.4, "No benefit is gained from the second ground rod if placed closer than the length of the longer rod. No additional benefit is gained if the second rod is placed over four times the length of the longer rod."
2. New Text
3. Add to the end of the end of the section: Where more than one rod or pipe electrode are used for the same system, the distance between electrodes shall not be less than the length of the longest rod or pipe and not exceed four times the length of the longest rod or pipe.
4. Substantiation: 1. I feel section 250.56 should be deleted completely. (proposal already provided for this) 2. The spacing requirements in this section only applies to rod, plate, and pipe electrodes installed to meet this section. There is no requirement for electrode spacing under any other purpose for the same system. 3. 250.53(B) spacing requirements only apply to electrodes of different systems. 4. One of the primary purposes of electrical system grounding is to limit the voltage imposed by lightning as indicated in 250.4(A)(1). Per the NFPA 780 section A.4.13.2.4, "No benefit is gained from the second ground rod if placed closer than the length of the longer rod. No additional benefit is gained if the second rod is placed over four times the length of the longer rod."