Pennsylvania Code › Title 34 - LABOR AND INDUSTRY › Part I - Department of Labor and Industry › Chapter 39 - SAFETY STANDARDS-GENERAL › Subchapter B - ELECTRIC SAFETY › PROTECTIVE ARRANGEMENTS OF EQUIPMENT › Section 39.103 - Protective grounding

Current through Register Vol. 54, No. 28, July 13, 2024
(a)
Grounding method.
Lightning arresters, grounding, and all
					 grounding of circuits, equipment or wire runways, intended to be a permanent
					 and effective protective measure, shall be made in accordance with methods
					 specified in §§
											39.61-39.70 (relating to methods of
					 protective grounding).
(b)
Grounding noncurrent-carrying metal parts.
Electrical supply
					 equipment, if operating at over 150 volts to ground, or if in hazardous
					 locations, shall have their exposed noncurrent carrying metal parts, such as
					 frames of generators, motors, and switchboards, and cases of transformers and
					 oil switches, permanently grounded. References should also be made to
					 §§
											39.115 and
					 39.159 (relating to grounding
					 noncurrent-carrying parts; grounding noncurrent-carrying metal parts). When
					 regulating voltage, generators or converters supplying circuits not exceeding
					 140 volts to ground are operated at not more than 180 volts, such generators or
					 converters are considered not to exceed 150 volts to ground. Hazardous
					 locations include those where dampness, acid fumes, explosives, inflammable
					 gas, or flyings normally exist.
(c)
Exemptions.
Exposed noncurrent-carrying metal parts of
					 electrical supply equipment operating on grounded direct current circuits or on
					 series direct-current circuits may be left ungrounded if no inflammable gas is
					 present, and if suitable insulating floors, platforms, or mats are used, so
					 that no person may inadvertently come in contact with such ungrounded parts
					 while he is standing upon any grounded surface, including floors not of
					 insulating material; and further if suitable permanent insulating barrier
					 guards are used so that a person may not, while touching the ungrounded parts
					 at the same time inadvertently touch other machine frames or metallic fixtures
					 not bonded to the parts in question. This provision shall not apply to the
					 motor frame of a direct connected, motor driven, high tension, series generator
					 sets in existing installations, when the generators have their frames insulated
					 from ground, for operating reasons, and the motor frames are grounded, if it is
					 impracticable to provide insulating barrier guards in the space available.
					 Reference should also be made to §
											39.115 (relating to
					 noncurrent-carrying parts).
(d) If
					 exposed noncurrent-carrying metal parts are not grounded they shall be suitably
					 insulated from the ground and from neighboring grounded surfaces.
This section cited in 34 Pa. Code §
													39.115 (relating to grounding
						  noncurrent-carrying parts); 34 Pa. Code §
													39.159 (relating to grounding
						  noncurrent-carrying metal parts); and 34 Pa. Code § 39.176 (relating to
						  grounding).