Oregon Administrative Rules › Chapter 437 - DEPARTMENT OF CONSUMER AND BUSINESS SERVICES, OREGON OCCUPATIONAL SAFETY AND HEALTH DIVISION › Division 2 - GENERAL OCCUPATIONAL SAFETY AND HEALTH RULES › Section 437-002-2320 - Substations

Current through Register Vol. 63, No. 7, July 1, 2024
This paragraph provides additional requirements for substations
				and for work performed in them.
(1)
			 Access and working space. The employer must provide and maintain sufficient
			 access and working space around electric equipment to permit ready and safe
			 operation and maintenance of such equipment by employees.
Note
to paragraph (1): American National Standard:
				National Electrical Safety Code, ANSI/IEEE C2-2012 contains guidelines for the
				dimensions of access and working space about electric equipment in substations.
				Installations meeting the ANSI provisions comply with paragraph (u)(1) of this
				rule. Oregon OSHA will determine whether an installation that does not conform
				to this ANSI standard complies with paragraph (1) of this rule based on the
				following criteria:
Whether the installation conforms to the edition of ANSI C2
				that was in effect when the installation was made.
Whether the configuration of the installation enables employees
				to maintain the minimum approach distances, established by the employer under
				paragraph (3)(a) of 437-002-2311, while the employees are working on exposed,
				energized parts, and
Whether the precautions taken when employees perform work on
				the installation provide protection equivalent to the protection provided by
				access and working space meeting ANSI/IEEE C2-2012.
(2) Draw-out-type circuit breakers. The
			 employer must ensure that, when employees remove or insert draw-out-type
			 circuit breakers, the breaker is in the open position. The employer must also
			 render the control circuit inoperable if the design of the equipment permits.
(3) Substation fences. Conductive
			 fences around substations must be grounded. When a substation fence is expanded
			 or a section is removed, fence sections must be isolated, grounded, or bonded
			 as necessary to protect employees from hazardous differences in electric
			 potential.
Note
to paragraph (3): IEEE Std 80-2000, IEEE
				Guide for Safety in AC Substation Grounding, contains guidelines for protection
				against hazardous differences in electric potential.
(4) Guarding of rooms and other spaces
			 containing electric supply equipment.
(a)
			 Rooms and other spaces in which electric supply lines or equipment are
			 installed must meet the requirements of paragraphs (4)(a) through (4)(e) of
			 this rule under the following conditions:
(A)
			 If exposed live parts operating at 50 to 150 volts to ground are within 2.4
			 meters (8 feet) of the ground or other working surface inside the room or other
			 space,
(B) If live parts operating
			 at 151 to 600 volts to ground and located within 2.4 meters (8 feet) of the
			 ground or other working surface inside the room or other space are guarded only
			 by location, as permitted under paragraph (5)(a) of this rule, or
(C) If live parts operating at more than 600
			 volts to ground are within the room or other space, unless:
(i) The live parts are enclosed within
			 grounded, metal-enclosed equipment whose only openings are designed so that
			 foreign objects inserted in these openings will be deflected from energized
			 parts, or
(ii) The live parts are
			 installed at a height, above ground and any other working surface, that
			 provides protection at the voltage on the live parts corresponding to the
			 protection provided by a 2.4-meter (8-foot) height at 50 volts.