§ 39.70. Joint use of grounds and ground conductors for different systems.
(a) Ground conductors. Ground conductors shall be run separately to the ground or to a sufficiently heavy grounding bus or system ground cable which is well connected to ground at more than one plate from equipment and circuits of each of the following classes:
(1) Lightning arresters.
(2) Secondaries connected to low voltage lighting or power circuits.
(3) Secondaries of current and potential transformers and cases of instruments on these secondaries.
(4) Frames of direct current railway equipment and of equipment operating in excess of 750 volts.
(5) Frames of utilization equipment or wire runways other than covered by paragraph (4).
(b) Grounds. Lightning arrester ground connections shall not be made to the same artificial ground such as driven pipes or buried plates as circuits or equipment, but should be well spaced and, where practicable, at least 20 feet from other artificial grounds.
Cross References This section cited in 34 Pa. Code § 39.61 (relating to applicability); 34 Pa. Code § 39.62 (relating to scope); 34 Pa. Code § 39.63 (relating to modifications or waiver of provisions); 34 Pa. Code § 39.66 (relating to nature of ground connection); 34 Pa. Code § 39.103 (relating to protective grounding); 34 Pa. Code § 39.183 (relating to ground wires); 34 Pa. Code § 39.197 (relating to grounding); 34 Pa. Code § 39.219 (relating to grounding or isolating service conduits); 34 Pa. Code § 39.292 (relating to grounding noncurrent-carrying parts); and 34 Pa. Code § 39.304 (relating to grounding of arresters for signaling systems).
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