PMP 450 Planning Guide
General protection requirements
To adequately protect a PMP 450 installation, both ground bonding and transient voltage surge suppression are
required.
Basic requirements
The following basic protection requirements must be implemented:
•
The equipment must be in ‘Zone B’ (see
on page
•
The AP must be grounded to the supporting structure.
•
A surge suppression unit (600SS) must be installed close to the SM.
•
The distance between the SM and 600SS should be kept to a minimum.
•
The drop cable length between the SM and 600SS must be less than 600 mm.
•
An surge suppression unit (200SS) must be installed within 600 mm (24 in) of the point at which the power
cable enters the building or equipment room.
•
The drop cable 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 a 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 implemented:
•
Grounding conductors must be run as short, straight, and smoothly as possible, with the fewest possible number
of bends and curves.
•
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.
Figure 23 Grounding cable minimum bend radius and angle
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pmp-0047 (March 2014)
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Summary of Contents for PMP 450
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