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USACE / NAVFAC / AFCESA
UFGS-16410N (February 2003)
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Preparing Activity: NAVFAC
Superseding
UFGS-16410N (August 2000)
UNIFIED FACILITIES GUIDE SPECIFICATIONS
References are in agreement with UMRL dated 23 June 2005
Latest change indicated by CHG tags.
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SECTION 16410N
AUTOMATIC TRANSFER SWITCHES
02/03
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NOTE: This guide specification covers the
requirements for automatic transfer switches
intended for use in Emergency Electrical Power
Systems meeting requirements of NFPA 70, NFPA 99,
and MIL-HDBK-1191.
Comments and suggestions on this guide specification
are welcome and should be directed to the technical
proponent of the specification. A listing of
technical proponents, including their organization
designation and telephone number, is on the Internet.
Recommended changes to a UFGS should be submitted as
a Criteria Change Request (CCR).
Use of electronic communication is encouraged.
Brackets are used in the text to indicate designer
choices or locations where text must be supplied by
the designer.
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NOTE: The following system design requirements
shall be adhered to when providing automatic
transfer switches:
1.
Provide four-pole transfer switches. The
neutral conductor for each source of supply,
including the neutral on separately derived systems,
shall be switched by the transfer switch.
2.
Do not install transfer switches on the supply
side of service equipment. When the transfer switch
is to be located on the supply side of service
loads, provide an independent service overcurrent
protection device on the supply side of the transfer
switch.
SECTION 16410N
Page 3
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