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General Information Please read all the information in
this Section before applying a fuse or circuit breaker to a diesel engine start
circuit arrangement. For assistance,
contact MSHA’s Approval and Title 30 Code of Federal
Regulations (30CFR) Sections 75.1910(a), 75.1910(b), 75.1910(c), 75.1910(d),
75.1910(e), and 75.1910(f) provides the requirements for overcurrent
protection of electrical circuits on nonpermissible outby diesel-powered equipment directly using storage
batteries and integral charging systems.
These sections refer to Sections 75.518 and 75.518-1 for adequate
overload and short circuit protection on the equipment. Sections 75.518 and 75.518-1 refer to the
1968 National Electrical Code (NEC).
Overload and short circuit protections of
electrical circuits and components on outby
diesel-powered equipment are adequate when they meet or exceed the safety
requirements in the 1968 NEC. The following list is one method
for selecting short circuit and overload protection to comply with the
regulation. The list may be used by mine
operators to comply with Section 75.1910. This method works only when all
specified components are applied as a group. The list
consists of engines, batteries, battery cables, fuses, circuit breakers, and
available circuit interrupters. A row of
components must be applied as a group to comply with Section 75.1910. A Nuisance Tripping and Trouble Shooting
Guide and starter circuit wiring diagrams are also provided. Wiring diagrams are provided for installing the
circuit interrupters, circuit breakers, and fuses. All
batteries are heavy duty or commercial
batteries and are a significant factor in the application of the fuses and circuit
breakers using this method. The battery
size in cold cranking amps (CCA) and battery cable size must be maintained as
listed to insure that the fuses and/or circuit breakers will function when
necessary. Only listed batteries are acceptable when using this method of
compliance. Alternate
batteries may be substituted for the listed battery only as follows:
When two
batteries are listed, two of the same size battery (in CCA) must be used. All
starters must be original equipment starters or complete high quality
rebuilds. Partially rebuilt starters are
highly susceptible to nuisance tripping. Note: For questions or comments contact the Approval and Certification Center, RR1, Box 251, Industrial Park Road, Triadelphia, WV 26059. Phone (304) 547-0400. Available Resources
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