User's Manual

Site Preparation

– continued

Apr 2001

V02.03

4812ET RF and Power Cabinet Hardware Installation Manual

DRAFT

– Adequate ventilation must be available to dissipate heat loads of

7,500 Watts (25,600 Btu / hr) for the RF Cabinet and 3,000 Watts

(10,300 Btu / hr) for the Power Cabinet (a total of 10,500 Watts;

35,900 Btu / hr), and maintain a maximum temperature of no

greater than 50 Deg C (122 Deg

F).

– The AC meter and main disconnect should not be mounted to either

cabinet.

– Locations should be selected that will minimize accidental or

intentional vandalism. Do not select a location that is, or may be,

subject to submersion (i.e. diversion channels, sub–basements, etc).

While the RF and Power Cabinet are well insulated from the

environment, they will not tolerate submersion.

– There should be adequate clearance through doors and passageways

to allow movement of the cabinet from the delivery area to the

installation site.

– Verify, prior to final site selection, the availability and accessibility

to good grounding (ground system resistance must be less than 10

Ohms, with 5 Ohms or less being the goal; see ”Recommended

Documentation” for Grounding Guidelines), RF cabling, Telco

wiring, and 208–240 VAC power.

– There should be adequate space available for the future addition of

expansion or optional equipment.

– The location of an AC power pedestal to mount the AC meter, main

breaker, generator plug, etc. (if necessary), is at the installers option.

– Every effort should be made to minimize the separation distance

between the RF and Power Cabinet (see Table 2-1) for maximum

cable length between cabinets

Table 2-1: DC Cabling Size – Maximum Cable Length

Cable Size Resistance per 1,000 ft @ 50Deg C

mW (THHN Cable)

Maximum Cable Length

(Max Total Voltage Drop  0.4V,

assumes 90A per cable)

2/0 AWG 96.8 (Superflex) 6.7 m (22 ft)

4/0 AWG 54 (Duraflex) 12.5 m (41 ft)

NOTE

– 3.65 m (12 ft.) is the length of the # 2/0 AWG DC Power Cable supplied with the Power Cabinet.

– If a custom cable is used, 610 mm (2 ft.) should be reserved at both ends to allow for the distance from the

edge of the cabinet to the power terminals.