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UL 1053 Document Information:
Title
UL Standard for Safety Ground-Fault Sensing and Relaying Equipment
Underwriters Laboratories Inc.
Publication Date:
Oct 27, 1999
Scope:
These requirements cover ground-fault current sensing devices,
relaying equipment, or combinations of ground-fault current sensing
devices and relaying equipment or equivalent protection equipment
for use in ordinary locations that will operate to cause a
disconnecting device to open all ungrounded conductors at
predetermined values of ground-fault current, in accordance with
the National Electrical Code, ANSI/NFPA 70.
These requirements cover equipment intended for use in circuits
that are solidly grounded.
These requirements do not cover equipment intended to be powered
from single-phase circuits operating at more than 600 volts or
three-phase circuits operating at more than 600 volts
phase-to-phase.
These requirements do not cover ground-fault
circuit-interrupters.
These devices are intended to operate with shunt-trip circuit
breakers, electrically tripped bolted pressure contact switches and
the like that constitute the disconnecting means.
A Class I ground-fault protection device is one that does not
incorporate means to prevent opening of the disconnecting means at
high levels of fault current and is intended for use with the
following:
Circuit breakers,
Fused circuit breakers,
Fused switches having an interrupting rating not less than 12
times their ampere rating, or
Fused switches having integral means to prevent disconnecting at
levels of fault current exceeding the contact interrupting rating
of the switch.
A Class II ground-fault protection device is one that
incorporates means to prevent initiation of opening of the
disconnecting device if the fault current exceeds the contact
interrupting capability of the disconnecting device with which it
is intended to be used.
These requirements cover enclosed-type devices and also cover
open-type devices that are intended for use in other equipment,
such as panelboards, switchboards, and the like.
A product that contains features, characteristics, components,
materials, or systems new or different from those covered by the
requirements in this standard, and that involves a risk of fire or
of electric shock or injury to persons shall be evaluated using
appropriate additional component and end-product requirements to
maintain the level of safety as originally anticipated by the
intent of this standard. A product whose features, characteristics,
components, materials, or systems conflict with specific
requirements or provisions of this standard does not comply with
this standard. Revision of requirements shall be proposed and
adopted in conformance with the methods employed for development,
revision, and implementation of this standard.
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