Technical Requirements -
Mechanical/Plumbing/Electrical
Power Distribution
One duplex, Isolated ground (IG), receptacle shall be provided from computer grade
isolated power at each workstation. Each workstation shall also have two duplex
house power (non-conditioned) receptacles for desk lamps, fans, pencil
sharpeners, etc. IG receptacles shall also be provided for printers, modems, and
other identified ADP equipment.
Where raised access floors are utilized in general office areas, modular power and
data/voice distribution systems are recommended. Note that system furniture
supplied power strips including data and telephone connections must be
coordinated with the types of power/telephone and data connections provided in the
office area. When planning for installation be aware that a variety of devices
(hardwired and other) are available and not from all manufacturers furniture. These
devices are not necessarily compatible with floor or wall mounted power/telephone
and data outlets. We highly recommend that telephone, data and power for
workstations be connected at the floor or wall receptacle module and not at desktop
level; connections at desktop level increase the number of wiring connections,
negate the purpose of the modular or building wire, data and telephone cable
system and reduce the ease at which system furniture can be moved when this
becomes necessary.
In low density areas place 2 workstations on each 20 amp isolated, computer grade
circuit using one (1) IG, duplex receptacle and associated wiring for each
workstation. In higher density areas such as training rooms and telephone pool
areas a maximum of 3 workstations may be placed on a 20A circuit. Laser printers
(e.g. HP III, HP IV, etc.) draw about 10A ea. and should have dedicated 20 amp, IG
circuits.
Emergency Power
In providing emergency power, the following items need to be considered:
1. Life safety lighting and computer room lighting.
2. All automatic temperature control systems, including pneumatic
air
compressors, air dryers, local and central engineering controls (CEC).
Rooms.
VBA Design Guide
Page 4-13
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