2.3.5
Output Switches
2.3.5.1
Control Relays
Shall be double pole, double throw (DPDT), UL listed, with contacts rated
to the application, indicator light, and dust proof enclosure. Light
indicator is lit when coil is energized and is off when coil is not
energized. Relays shall be socket type, plug into a fixed base, and
replaceable without need of tools or removing wiring. Encapsulated "PAM"
type relays are permissible for terminal control applications.
2.3.5.2
Solenoid Air Valves
Each valve shall have three port operation: common, normally open, and
normally closed. Internal parts shall be brass, bronze, or stainless
steel. Valves shall be rated at 50 psig minimum when used in a control
system operating at 25 psig or less, or 150 psig when used in a control
system operating in the range 25 to 100 psig.
**************************************************************************
NOTE: In most cases, use Naval Facilities Guide
Specification 16402, "Interior Distribution
Systems", for specifying electrical power and
wiring. Delete redundant or ambiguous sections out
of this specification after modifying NFGS 16402.
**************************************************************************
2.4
ELECTRICAL POWER AND DISTRIBUTION
For controller power provide a new, dedicated 120 VAC 60 Hz source, three
wire (black, white, and green). Run green ground wire to panel ground;
conduit grounds are not sufficient.
2.4.1
Transformers
Transformers shall conform to UL 506. Power digital controllers and
terminal control units (TCU's) from dedicated circuit breakers with surge
protection specified. Transformers for digital controllers serving
terminal equipment on lower level LANs may be grouped to have specified
surge protection sized for the number of controllers on a single
transformer. Provide a fuse on the transformer secondary side.
2.4.2
Surge Protection
Surge and transient protection consist of devices installed externally to
digital controllers.
2.4.2.1
Power Line Surge Protection
Surge suppressors external to digital controller, shall be installed on all
incoming AC power. Surge suppressor shall be rated by UL 1449, have a
fault indicating light, and have clamping voltage ratings below the
following levels:
a.
Unit is a transient voltage surge suppressor 120 VAC/1 phase/2
wire plus ground, hard wire individual equipment protector.
b.
Unit must react within 5 nanoseconds and automatically reset.
SECTION 15910N
Page 45
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