User's Manual

ADCP-75-210 • Issue 1 • November 2006

Page 34

2.5 Installing a RAN Cabinet on a Wooden Utility Pole

Figure 24 shows the main components and their spatial placement in a typical NXD RAN pole

mount installation.

2.5.1 Site Requirements Unique to Pole Mounting Locations

If power lines are present at the top of the pole, spacing requirements applicable to the RF

cabling and any other hardware installed in the electric space must be considered. Per the

National Electrical Safety Code, vertical clearance at supports for primary-supply conductors

above other facilities is required to be 16 in. (40.64 cm) above neutrals and 40 in. (101.6 cm)

above communications (60 in. [152.4 cm] if above 8700V).

For supply conductors at voltages up to 8700 between conductors, the minimum horizontal

clearance provided by the NESC ANSI C2 is 12 in. (30.5 cm). For higher voltages, it is required

that .4 in. (10.2 mm) be added for every 1000V above 8700. Table 18 lists the required

clearances for some common high voltages.

This information is from the Standard Handbook for Electrical Engineers, 13th Edition,

McGraw Hill, Chapter 18, Section 151, Pages 18-65.

Table 18. Antenna Clearance vs. Voltage

VOLTAGE HORIZONTAL CLEARANCE

8700V 12.0 in. (30.5 cm)

15 kV 14.52 in. (36.9 cm)

28 kV 19.72 in. (50.1 cm)

38 kV 23.72 in. (60.2 cm)