View all text of Subchapter III [§ 861 - § 878]
§ 869. Underground low- and medium-voltage alternating current circuits
(a) Circuits providing power for three-phase equipment; circuit breakers
(b) Circuits used underground; direct neutral grounds; ground conductors for frames; exceptions; grounding resistors
(c) Inclusion of fail safe ground check circuits in resistance ground systems; operative functions; time extension; couplers for power circuits; guidelines for construction
(d) Disconnecting devices installed in conjunction with circuit breakers; purpose; trailing cables for mobile equipment; guidelines for construction; time extension; splices
(e) Connections of single phase loads
(f) Circuit breakers; markings
(g) Trailing cables for medium voltage circuits; guidelines for construction
(Pub. L. 91–173, title III, § 309, Dec. 30, 1969, 83 Stat. 782.)