§ 690-342. High-voltage longwall mining systems
Purdon's Pennsylvania Statutes and Consolidated StatutesTitle 52 P.S. Mines and MiningEffective: January 5, 2009
Effective: January 5, 2009
52 P.S. § 690-342
§ 690-342. High-voltage longwall mining systems
(a) General rule.--In each high-voltage motor-starter enclosure, with the exception of a controller on a high-voltage shearer, the disconnect device compartment, control/communications compartment and motor contactor compartment shall be separated by barriers or partitions to prevent exposure of personnel to energized high-voltage conductors or parts. Barriers or partitions shall be constructed of grounded metal or nonconductive insulating board.
(a.1) High-voltage shearers.--In each motor-starter enclosure on a high-voltage shearer, the high-voltage components shall be separated from lower voltage components by barriers or partitions to prevent exposure of personnel to energized high-voltage conductors or parts. Barriers or partitions shall be constructed of grounded metal or nonconductive insulating board.
(b) Interlock switches.--Each cover of a compartment in the high-voltage motor-starter enclosure containing high-voltage components shall be equipped with at least two interlock switches arranged to automatically de-energize the high-voltage components within that compartment when the cover is removed.
(d) Transformers.--Transformers with high-voltage primary windings that supply control voltages shall incorporate grounded electrostatic (Faraday) shielding between the primary and secondary windings. The shielding shall be connected to the equipment ground by a minimum No. 12 AWG grounding conductor. The secondary nominal voltage shall not exceed 120 volts, line to line.
(e) Test circuits.--Test circuits shall be provided for checking the condition of ground wire monitors and ground-fault protection without exposing personnel to energized circuits. Each ground-test circuit shall inject a primary current of 50% or less of the current rating of the grounding resistor through the current transformer and cause each corresponding circuit-interrupting device to open.
(j) Instantaneous ground fault protection.--High-voltage motor and shearer circuits shall be provided with instantaneous ground fault protection of not more than 0.125 of an ampere. Current transformers used for this protection shall be of the single window type and shall be installed to encircle all three-phase conductors.
Credits
2008, July 7, P.L. 654, No. 55, § 342, effective in 180 days [Jan. 5, 2009].
52 P.S. § 690-342, PA ST 52 P.S. § 690-342
Current through Act 13 of the 2024 Regular Session. Some statute sections may be more current, see credits for details.
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