3. Grounding and lightning protection
PTP 500 Installation Guide
phn-2508_005v000 (Mar 2013)
Page 11
General protection requirements
Apply the practices and procedures detailed in the relevant national standards
to all
new site build activities. The following requirements are described in greater detail in
the
PTP 500 and PTP 300 Series User Guide
.
Basic requirements
The following basic protection requirements must be met:
•
The equipment (ODU) must be in Zone B.
•
The ODU must be grounded to the supporting structure.
•
A lightning protection unit (LPU) must be installed within 600 mm (24 in) of the
point at which the drop cable enters the building or equipment room.
•
The drop cable must be bonded to the supporting structure in order to prevent
lightning creating a potential between the structure and cable, which could cause
arcing, resulting in fire risk and damage to equipment.
•
The drop cable shield must be grounded at the building entry point.
•
The drop cable must not be laid alongside a lightning air terminal.
•
All grounding cables must be minimum size of 10 mm
2
csa (8AWG), preferably
16 mm
2
csa (6AWG), or 25 mm
2
csa (4AWG).
Grounding cable requirements
When routing, fastening and connecting grounding cables, the following requirements
must be met:
•
Grounding conductors must be run as short, straight and smooth as possible, with
bends and curves kept to a minimum.
•
Grounding cables must not be installed with drip loops.
•
All bends must have a minimum radius of 203 mm (8 in) and a minimum angle of
90°. A diagonal run is preferable to a bend, even though it does not follow the
contour or run parallel to the supporting structure.
•
All bends, curves and connections must be routed towards the grounding electrode
system, ground rod, or ground bar.
•
Grounding conductors must be securely fastened.
•
Braided grounding conductors must not be used.
•
Approved bonding techniques must be used for the connection of dissimilar metals.
