User's Manual

Access P oint Hardw are Installation Earth Ground and P ower Cables
Earth Ground and Power Cables
■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■
■
■
The objective of this procedure is to install the power and earth ground cabling for the Base
Control Unit (B CU) and RF Head.
Grounding Considerations
Above Ground F or ground rings and the interconnection of internal and external ground
rings, #2 to #6 A WG may be used. F or grounding of equipment and miscellaneous metallic
objects, #6 A WG minimum is required.
Exceptions Connection from an isolated ground bar (IGB) to master ground bar (MGB) is
accomplished using #2 to #6 A WG . The external ground bar (EGB) is grounded through a 2 -inch
wide, 16 -gauge copper strap, if available; otherwise, 2 -#6 A WG wires can be used. If the #6
A WG wires are used, then they must be connected at opposite ends of the EGB and have a
minimum separation of 12 -inches between them.
Below Ground All wire must be #2 A WG as a minimum. Ground rods are to be a minimum of
8 feet long and 5/8 -inch in diameter . In the case of a deep basement next to the rod, the rod
must be long enough to extend 3 feet below the basement floor .
Power Considerations
The Base Control Unit (B CU) is designed for 100/240 V AC (88–300 Vrms) @ 45–66 Hz, +21
to +30 VDC or —60 to —40VDC .
The system configuration determines which power cables are installed. The ground cable is
always installed first. Based on the system configuration perform the appropriate procedures
described in Chapter 4 Access P oint Hardware Installation .
DC Power (RF Head)
The DC power cable is orderable in a variety of lengths as indicated in T able 3 -3 below .
Depending on site configuration all of one length or a combination of lengths (up to 4) may be
used.
68P09277A59 -5 3 -5
Draft OCT 2006