250.53(d)(2)
A metal underground water pipe shall be supplemented by an additional electrode of a type specified in 250.52(A)(2) through (A)(8).
Where the supplemental electrode is a rod, pipe, or plate type, it shall comply with 250.56.
250.66 A single electrode consisting of a rod, pipe, or plate that does not have a resistance to ground of 25 ohms or less shall be augmented by one additional electrode of any of the types specified by 250.52(A)(4) through (A)(8).
The way I understand this, is I need (2) electrodes every time a panel is being upgraded. Because usually an existing dwelling structure doesn't have other electrodes available.
Please confirm.
I just learned this yesterday. Its funny how I read a code section for million times and it doesn't click in, then one day....... i am thinking WHAT is this talking about?
A metal underground water pipe shall be supplemented by an additional electrode of a type specified in 250.52(A)(2) through (A)(8).
Where the supplemental electrode is a rod, pipe, or plate type, it shall comply with 250.56.
250.66 A single electrode consisting of a rod, pipe, or plate that does not have a resistance to ground of 25 ohms or less shall be augmented by one additional electrode of any of the types specified by 250.52(A)(4) through (A)(8).
The way I understand this, is I need (2) electrodes every time a panel is being upgraded. Because usually an existing dwelling structure doesn't have other electrodes available.
Please confirm.
I just learned this yesterday. Its funny how I read a code section for million times and it doesn't click in, then one day....... i am thinking WHAT is this talking about?
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