Alpha Technologies PN-4 - Manual (Page 14)

2. Pre-Installation
14
031-103-B0-003 Rev. C © 2002 TM
2.3 Enclosure Grounding, continued
Lightning Protection (Optional)
1/2" x 8' copper ground rod, four places, driven about 2 feet (typical) from the corners of the pad.
#2 bare copper wire loop terminated to each ground rod and buried below grade 2 to 12 inches.
Corrosion-proof connections (25+ year life-span) and hardware suitable for direct burial MUST be used.
#2 bare copper wire from loop to the enclosure
When the electrical supply is a primary service (not a secondary or feeder service) a #2 bare copper wire
must be bonded to the lightning protection loop to the Grounding Electrode Conductor where they are
closest.
Service Grounding (required)
#2 bare copper wire from Service Neutral / Ground Bar down 30 inches and out 20 feet beyond the pad
edge. This is often called a UFER ground (Ground Ring in the NEC).
Opening for
Sweeps
Opening for
Sweeps
Enclosure Footprint
20 feet (minimum)
2 f
ee
t
(m
in)
8 211(&7,21 Г 0$'( Г :,7+
7 851'< Ã &211(&725
3 1 Ã`BCS$'8!X"Ã 25
(48,9$/(17
8 211(&7,21 Г 0$'( Г :,7+
7 851'< Ã &211(&725
3 1 Ã`BCQ$'8!X!UI
25 Ã (48,9$/(17
30
i
n
c
hes
Side view
UFER Ground
SE
conduit &
wires
GEC
#2 bare
copper
wire
No
separation
is required.
#2 AWG
#2 AWG
Opening for
Sweeps
1
2
3
4
5
4
5
1
2
3
Figure 2-4; Alternate Grounding, PN-3 and PN-4