The communication be-tween the bays themselves and between the bays and the substation control computer is established by a small num-ber of serial fiber optic buses that re-place the traditional hard-wired single signal connections. There may be other equipment rooms which also contain electronics located in the building connected using what is called "backbone cable. " The "telecommunications closet," or as it is now called "telecommunications room (TR)," is the (typically) small equipment room closest to the end user, where. The control and power wires for all the operating mechanisms, auxiliary switches, alarms, heaters, CTs, and VTs are brought from the GIS equipment modules to the LCC using shielded multiconductor control cables. In addition to providing terminals for all the GIS wiring, Although the LCC is an extra. Rules pertaining to fire alarm cables in 645. 3 (E), communications cables in 645. 3 (H) was added to include requirements for. Commercial buildings are increasingly wired with fiber optic cable to future-proof installations and create more reliable, higher-bandwidth and faster speed network and video infrastructures.
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