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Page Title:
Fuses, fuseholders, fusing, and circuit breakers |
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|  MIL-S-17000N( SH)
3.6.5 Fuses, fuseholders, fusing, and circuit breakers.
3.6.5.1 Fuses. Fuses shall be style F03 or F77A in accordance with
MIL-F-15160/3 or MIL-F-15160/77 and shall be provided and installed as required
by the applicable detail schematic wiring diagrams. Fuses under 1 A rating
shall not be used. Fuse size shall be indicated by marking adjacent to each
fuse. Unless required by the detail schematic wiring diagrams to be on the
supply side of the switch, fuses shall be on the load side of the switch.
3.6.5.1.1 Spare fuse stowage. One "short depth" panel space for spare
fuse stowage shall be provided for each three switchboard sections or fraction
thereof. Each panel space shall contain four sectioned drawers of sufficient
size to stow the spare fuses provided for the associated sections (see 3.9 for
approximate quantities). Drawers shall be provided with a door to prevent
their being dislodged under shock. Door shall be secured with a flush cabinet
latch.
3.6.5.2 Fuseholders. Fuseholders shall be located on the operating surface
of equipments, except where location within equipment is specified in the ATDP.
Inside locations of fuseholders will be specified only where utmost space economy
is necessary and the fused circuit is nonvital. Where a color cap is used to
indicate a specific voltage rating of a fuseholder, a paint or decal marker (the
same color as the cap of the fuse carrier) shall be located adjacent to the fuse-
holder.
3.6.5.2.1 Fuseholders shall be of the dead-front blown-fuse indicating
types as specified in 3.6.5.2.1.1 and 3.6.5.2.1.2.
3.6.5.2.1.1 For circuit loads from 1 to 15 A and voltages up to 125 V a.c.
and d.c. type FHL57G fuseholders conforming to MIL-F-19207 and MIL-F-19207/38
shall be used, using fuse style F77A in accordance with MIL-F-15160/77.
3.6.5.2.1.2 For circuit loads of 16 to 30 A,
type FHL29G fuseholders
conforming to MIL-F-19207 and MIL-F-19207/18 shall
be used on 12- to 90-V
circuits and type FHL1OU fuseholders conforming to
MIL-F-19207 and MIL-F-19207/l
shall be used on 91- to 250-V circuits, using fuse
style F03 in accordance
with MIL-F-15160/3.
3.6.5.2.1.3 Meter circuits, buses, bus transfers, alarms, and feeders to
and from I.C. power converting equipment shall be in accordance with applicable
portions of figure 3. Fuses of 65 A or higher ratings which are used in trans-
formers bank primary circuits in accordance with figure 3 may be mounted in
shock and vibration proof open clips within the switchboard enclosure (450 V
unit) provided that associated blown fuse indicators are mounted on the hinged
panel and are plainly visible from the front of the switchboard with doors
closed. Secondary coils of current transformers shall be connected in such a
manner that whenever the coil, if not supplying current for a particular use,
will be shorted by the connecting transfer switch.
3.6.5.3 Blown fuse indicator circuit. Blown fuse indicator circuit used
with the type FHL57G fuseholders conforming to MIL-F-19207 and MIL-F-19207/38
shall be energized from the 115-V 60-Hz miscellaneous supply circuit through
fuses located on the power available indicator light panel. Specific circuits
will be shown on the applicable detail schematic wiring diagrams.
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