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MIL-DTL-917 Electric Power Equipment, Basic Requirements ForThis specification covers the basic requirements applicable to the design, materials, and construction of naval shipboard electric power equipment \(exclusive of communication equipment, information technology \(IT\) equipment, and combat systems [fire control and weapons control equipment]\). Unless otherwise specified herein, the electric equipment developed for shipboard use under the requirements of this specification are limited to a maximum 450 volt \(V\) alternating current \(AC\) and a maximum 1,000 V direct current \(DC\). This equipment is intended for use on surface and submarine naval vessels \(see 6.2\).

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MIL-DTL-917F(SH)
TABLE III. Electrical creepage and clearance distance. 1/
Creepage 3/
2/
Voltage AC or DC
Set
Clearance (inches)
Open (inches) 4/
Enclosed (inches) 5/
/16
/16
/16
1
1
1
A
⅛
⅛
⅛
Up to 64
B
⅛
/8
3
C
½
/16
/16
/16
1
1
1
A
⅛
⅛
Over 64­150
B
¼
/8
3
C
¼
¾
/16
/16
/16
1
1
1
A
⅛
⅛
Over 150­300
B
¼
C
¼
¾
½
⅛
⅛
/16
1
A
⅛
Over 300­600
B
¼
¼
C
¼
¾
½
⅛
/8
3
A
½
Over 600­1,000
B
¼
1
¾
C
½
2
1½
Over 1,000­15,000 6/
6/
6/
6/
C
NOTES:
1/
Use of electrical parts or assemblies such as potentiometers, connectors, printed wiring assemblies, and
similar devices having lesser creepage and clearance distances is permissible provided these parts and
assemblies conform with applicable military specifications, and their energized portions are enclosed to
protect against entry of dust and moisture.
2/
Set A ­ Normal operating volt-ampere rating up to 50.
Set B ­ Normal operating volt-ampere rating of 50 to 2,000.
Set C ­ Normal operating volt-ampere rating over 2,000.
3/
For top curved surfaces having a radius greater than 3 inches and for top flat surfaces, surface creepage
distance shall be increased 33 percent where these surfaces have irregularities which permit the accumulation
of dust and moisture.
4/
Open: Equipment or parts with open enclosures in accordance with MIL-STD-108.
5/
Enclosed: Equipment or parts with enclosures in accordance with MIL-STD-108, except open enclosures.
6/
For voltages above 1,000 V, but less than or equal to 15,000 V, use electrical creepage and clearance values
in accordance with IACS (UR) E11.
3.2.23 Piping systems. Piping systems shall have socket welded, butt welded, or flanged fittings. Silver
brazing and threaded pipe fittings shall not be used. For additional guidance, see S9086-RK-STM-010/505.
Requirements for material identification and control of piping systems shall be in accordance with
0948-LP-045-7010.
3.2.24 Screw thread standards for fastening devices. Screw threads for all threaded fastening devices shall be
in accordance with ASME B1.1. The threads shall be the coarse-thread series, unified form, Class 2A/2B unless the
component design indicates a necessity for the use of the fine thread series.
23



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