Project Name M-DCPS MASTER Nov. 2014
Project No. SPECIFICATION GUIDELINES 13745 − 13
1) Three No.12 AWG THHN or
2) Use associated intercom/paging system’s speaker wires for power and time
correction.
g. Provide all intercom and clock wiring in raceways. Mount a momentary push-
button remote from the speaker baffle for signaling the central console in each
room. Install suitable type hinged terminal cabinets as indicated on plans.
h. Provide marked terminal strips in all junction boxes. Soldered and tap joints will
not be permitted.
i. Provide isolating barrier in clock/speaker enclosure so as to keep wiring
separated.
5. Whenever possible, install homerun wiring in continuous runs from field device to
head-end terminal cabinet with no breaks or splices.
6. Splices in wire trays are not allowed. Clock splices/ taps shall be on screw terminals
or terminal strips in an accessible junction box. Wire terminations for the intercom and
clocks at the central equipment rack shall be made on terminal blocks, Suttle SE-
66M1-50 with SE-89D brackets, or accepted equivalent. The terminal blocks shall be
installed in a flush mounted terminal cabinet where possible, Brenner-Newman Model
BN7036 or accepted equivalent.
7. Systems utilizing fiber optic cabling between remote terminal cabinets and head-end
terminal cabinet are acceptable.
PART 3 EXECUTION
3.1 EXAMINATION
A. Do not proceed with the work of this section until conditions detrimental to the proper and
timely completion of the work have been corrected in an accepted manner.
3.2 PREPARATION
A. Provide necessary transient protection on the AC power feed, station lines leaving or
entering a building, and central office trunks. Protection shall be as recommended by the
equipment supplier and referenced to earth ground.
1. Lightning protection and transient voltage and surge suppression shall be provided as
recommended by system manufacturer.
B. The system shall be powered by a separately fused, 110 volt AC circuit fused with a circuit
breaker of 20 Amps. The circuit shall be on an electrical panel connected to the
emergency generator in case of a power failure.
C. Speaker wires and call-in circuits shall be protected by an individual circuits surge
suppressor or accepted equivalent at the central rack termination equipment cabinet.
Gang strips surge suppressors are not allowed.
D. Note in system drawings the type, locations, and wiring information of protection devices.
E. Wiring termination shall be accomplished on standard telephone-type punch down blocks.
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