All points bulletin for...Pipe Electrode ( a la 250.52(A)(5) )
What situations call for a 'pipe electrode' ?
Never seen one used; never seen one.
Why would anyone want to use a grounding electrode of pipe (or conduit) instead of using a ground rod ?
(although the Code in the 250.52(A)(5) mention of 'pipe electrode' may be ambigous in that nothing specifies that a 'pipe electrode' be exclusively an electrode, as opposed to something like a 'water pipe' serving as a water pipe AND also serving as an 'pipe electrode'. So is a 'pipe electrode', in 250.52-A-5, an electrode in the sense of a ground rod but is pipe instead of a rod ?).
Code quote:
--Thanks.
What situations call for a 'pipe electrode' ?
Never seen one used; never seen one.
Why would anyone want to use a grounding electrode of pipe (or conduit) instead of using a ground rod ?
(although the Code in the 250.52(A)(5) mention of 'pipe electrode' may be ambigous in that nothing specifies that a 'pipe electrode' be exclusively an electrode, as opposed to something like a 'water pipe' serving as a water pipe AND also serving as an 'pipe electrode'. So is a 'pipe electrode', in 250.52-A-5, an electrode in the sense of a ground rod but is pipe instead of a rod ?).
Code quote:
250.52(A)(5)
Rod and Pipe Electrodes. Rod and pipe electrodes shall not be less than 2.44 m (8 ft) in length and shall consist of the following materials.
(a)Grounding electrodes of pipe or conduit shall not be smaller than metric designator 21 (trade size ?) and, where of steel, shall have the outer surface galvanized or otherwise metal-coated for corrosion protection.
(b)Rod-type grounding electrodes of stainless steel and copper or zinc coated steel shall be at least 15.87 mm (5/8 in.) in diameter, unless listed.
--Thanks.
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