Do tell, who told you that?
Roger
Poco=========>>>>>>7.1.5 An approved ground shall be:
A) A metal underground water pipe in direct contact with the earth for 10 feet or
more (including any metal well casing effectively bonded to the pipe) in addition
to a supplemental ground rod.
B) Not less than two driven ground rods placed at a minimum of 6 feet apart when a
non-metallic water piping system exists or is to be installed. A separate
grounding conductor to each ground rod shall be utilized (as shown in section 11,
drawing D-7).
C) As outlined in the NEC, Article 250 - Grounding.
7.1.6 Under no circumstances shall a gas or fuel oil piping system be used as a grounding
electrode, nor should any CATV, telephone, electric or other bond wires be placed in
contact with gas mains or service piping, gas meters or regulators.
7.1.7 Where a continuous copper water system is installed from the street line to the interior of
the building (which includes bonding of the water meter, whether located indoors or
outdoors), grounding shall be accomplished by:
A) Installing a grounding conductor from the neutral block of the main switch to a
point where the water pipe enters the building, before the first pipe weld or fitting.
B) Installing a grounding conductor from the neutral block of the main switch to a
supplemental ground, namely, one driven ground rod.
7.1.8 Where a plastic water piping system is installed from the street line to the interior of the
building, grounding shall be accomplished by:
A) Installing two separate grounding conductors from the neutral block of the main
switch to a supplemental ground, namely, 2 driven ground rods. (See Section
7.1.4)
B) A bonding conductor from the neutral block of the main switch to the interior