MIL-DTL-23928G
TABLE I. Clearance and creepage for open construction.
Minimum creepage and clearance distances in inches 1/ 2/
Clearance
Creepage
Between live parts
Molded plastic
Machined laminated
Maximum panel
surface 3/
plastic surfaces
of opposite polarity
voltage
and live parts to
Between live parts
ground through free
of opposite polarity
Between live parts
Live parts to ground
air
and live parts to
of opposite polarity
ground
125 V ac/V dc
.25 ( 6.35)
.50 (12.70)
.75 (19.05)
.50 (12.70)
250 V ac/V dc
.50 (12.70)
.75 (19.05)
1.75 (44.45)
.75 (19.05)
600 V ac
.75 (19.05)
1.00 (25.40)
2.00 (50.80)
1.00 (25.40)
1/
Millimeters are in parentheses.
2/
Not applicable to circuit breakers or molded plastic plug-in mounting bases for circuit breakers.
3/
If molded plastic surface finish is disturbed, creepage distances for machined laminated plastic surfaces shall
apply (flash removal is not considered as disturbing finishes.)
3.3.5 Circuit breakers. AQB and NQB circuit breakers shall be in accordance with MIL-DTL-17361. ALB and NLB
circuit breakers shall be in accordance with MIL-C-17588. Unless otherwise specified (see 6.2), circuit breakers shall
not be furnished with the panels.
3.3.5.1 Wiring connections. Wiring connections for circuit breaker attachments, such as shunt trip, undervoltage,
and auxiliary switches shall be made to wiring terminal boards mounted in the panel.
3.3.5.1.1 Terminal boards. Terminal boards shall be in accordance with MIL-E-917.
3.3.6 Mounting bases and blocks for circuit breakers. Unless otherwise specified (see 3.1 and 6.2), mounting
bases or blocks, as applicable, shall be furnished for the maximum number of breakers that may be installed in the
panel.
3.3.6.1 Type ALB and NLB bases. Mounting bases for type ALB and NLB circuit breakers shall be in accordance
with MIL-C-17588. The mounting bases shall be arranged to permit circuit breaker installation and removal from the
front of the panel.
3.3.6.2 Type AQB and NQB bases and blocks. Mounting bases and blocks for type AQB and NQB circuit breakers
shall be in accordance with MIL-DTL-17361. Mounting bases or blocks shall be arranged to permit installation and
removal of circuit breakers and electrical connections from the front of the panel.
3.3.7 Indicator lights. When specified (see 3.1), indicator lights in accordance with MIL-DTL-3661 shall be
furnished complete with lenses (globes) (see 3.3.7.1) and applicable lamps as follows:
Indicator lights
Voltage
Type
Specification sheet
117 volts alternating
LH93/3
current (V ac)
LH94/3
LH98/3
LH93/4
450 V ac
LH94/4
LH98/4
LH96/5
120 volts direct
current (V dc)
LH96/6
240 V dc
5
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