Or. Admin. R. 918-305-0460 - Grounding
(1) System substations
shall be installed with a grounding grid to limit touch and step potentials to
safe levels as recommended by IEEE 80, "Guide for Safety in
Substation Grounding." AC and low-voltage equipment shall be bonded or
grounded to this grid, except as otherwise provided for the utility neutral or
ground. Calculations and ground resistance test reports for every substation
shall be furnished to the division prior to final inspection and maintained by
the operating entity.
(2) The
service neutral conductor is not required to be bonded to the substation
grounding grid, provided that:
(a) A warning
sign is posted on the service equipment to provide notice of potential hazards
to technical persons who may have access to the service equipment. The notice
shall clearly indicate that the neutral is isolated and not grounded;
(b) An isolation barrier is installed over
the neutral termination within the service equipment; and
(c) The ground grid is installed in a manner
that will demonstrate a ground resistance of 5 ohms or less when tested in
accordance with IEEE 81, "Guide for Testing Grounding
Systems."
(3)
Free-standing signal system cabinets, bungalows or buildings shall be
separately grounded by means of a driven ground electrode or electrodes to
obtain ground resistance of 25 ohms or less when tested in accordance with
IEEE 81.
(4) 60 Hz,
120-volt AC systems for accessory power or lighting located within station
platforms or substations shall meet the requirements of the Electrical
Specialty Code.
(5) All
service equipment receiving service voltage from the utility shall be posted
with warning signs to provide notice of potential hazards to technical persons
who may have access to the panel. The notice shall clearly indicate that the
neutral is isolated and not grounded.
(6) All fencing located within 10 feet of a
metallic railway substation, building, ground grid, bungalow or other structure
shall be constructed of nonmetallic material.
Notes
Publications: Publications referenced are available from the agency.
Stat. Auth.: ORS 479.950
Stats. Implemented: ORS 479.950
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