Program Policy Manual - VOLUME V - Mine Safety and Health ...

MSHA PROGRAM POLICY MANUAL VOLUME V
75.601-2 Short-Circuit Protection; Use of Fuses;
Approval by the Secretary
The voltage rating of a fuse shall not be less than the maximum
voltage of the circuit in which it is installed.
75.602 Trailing Cable Junctions
Plugs of the same size may be used for different cable sizes if
dowel pins or other devices are provided to insure that each cable
can only be connected to a circuit breaker of the proper size or
if the plugs and receptacles are connected by a short length of
chain long enough to permit the plug to be inserted into and
withdrawn from the proper receptacle only.
75.603 Temporary Splices of Trailing Cables
A splice includes the mechanical joining of a grounding conductor
that has been severed.
The connection of the trailing cable made inby the strain clamp on
cable reel equipment that does not have provisions for the
trailing cable to enter the collector ring compartment shall not
be considered a temporary splice. The method of cable attachment
accepted in the approval of the equipment will be in compliance
with this provision.
The conductors of a temporary splice shall be joined together so
that the passage of current will not create excessive heat at the
connection. Each power conductor, grounding conductor, and
ground-check conductor shall be individually spliced using a
proper splicing sleeve, ring, or clamp; each power conductor shall
be individually insulated with proper insulating tape, and the
outer jacket shall be replaced with flame-resistant tape or other
flame-resistant material to provide an outer jacket as thick as
the original.
Torn or damaged insulation on a trailing cable shall be
reinsulated and does not constitute a splice unless a conductor is
severed.
75.604 Permanent Splicing of Trailing Cables
Materials listed by MSHA's Approval and Certification Center as
flame resistant for use in making permanent splices in trailing
cables shall be used in complete accordance with the
manufacturer's instructions. Splice kits shall be applied without
substituting or altering any parts. Any deviation would require
additional evaluation or testing by MSHA. Without such
evaluation, such deviations shall constitute noncompliance with
this Section.
February 2003 (Release V-33) 70