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Page Title:
Standard electronic and electrical parts |
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|  MIL-S-17000N(SH)
18
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Derating of electronic parts and materials
Requirement
Requirement
Welds, resistance, electrical interconnections
24
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Requirement
29
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Electron tubes
Requirement
30
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Semiconductor devices
Requirement
Resistors
33
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Requirement
37
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Circuit breakers
Requirement
Rotary servo devices
56
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Requirement
69
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Internal wiring practices
3.6.1.1 Figures 3 and 4 show one-line wiring diagrams of typical I.C.
switchboards. The characteristics of each I.C. switchboard, the power supplies
and bus arrangements and the switchboard parts required shall be as specified
(see 6.2.1). (See figures 3 and 4.)
3.6.2 Standard electronic and electrical parts. Standard electronic and
electrical parts, defined as tHose listed in MIL-STD-242, shall be used when
the part is not specified herein. The procedure for the selection of electronic
and electrical parts and materials not specified herein or in MIL-STD-242 shall
be in accordance with MIL-STD-965 and the data ordering document included in
the contract (see 6.2.2).
3.6.3 Switches. Type LS switches (see 3.6.3.14) shall be used as the
primary switch in all switchboards except for type VII.
3.6.3.1 Switch assemblies (see 6.5.3). Normally only one switch of the
rotary selector or snaptype along with associated fuseholders and indicator
lights shall be mounted in a panel assembly (see 6.5.4). However, when speci-
fied in the ATDP, two rotary or snap switches may be mounted in one panel
assembly. Where sufficient space is not available within the assembly for the
associated items, those i.n excess may be located on a nearby panel on the same
switchboard section, preferably in the same horizontal row.
3.6.3.1.1 Type JR 10 rotary switches shall be used in place of snap type
rotary switches as "power supply (ON/OFF)" switches, for loads not in excess
of 10 amperes (A) unless otherwise specified in the ATDP.
3.6.3.1.2 For rotary or snap type switch assemblies, internal switch
wiring shall terminate on the fixed part of a connector receptacle with pin
contacts (or terminal board for loads in excess of 10 A) which shall be mounted
on the rear of the assembly.
3.6.3.1.3 Remotely operated RLS switches include remote control circuit
accessories (toggle switch, indicator lights, and fuseholders) and provide space
for mounting up to four additional fuseholders to accommodate up to eight load
circuit fuses. Manually operated MLS and MBLS switches provide space for mounting
up to six fuseholders to accommodate up to 12 load circuit fuses. Manually
operated MCLS switches may have provisions for any load circuit fuses. Remotely
operated RDLS switches include remote control circuit accessories (same as for
RLS but do not have provision for any load circuit fuses).
3.6.3.1.4 When supplying power, switch contacts shall not be paralleled
to obtain increased current carrying capacity. The large load shall be split
between two separate sets of switch contacts and associated separate wiring.
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