44
wallaceperimetersecurity.com
Phone: 866.300.1110
POWER
Power
Installing the Earth Ground
An earth ground refers to the grounding rod and accompanying equipment ground which need to be
installed to safeguard against potential electrical shock and damage to personnel and equipment.
The potential for lightning discharge
exists with all gates, barrier arms,
fences and gate systems. National
Electric Code (NEC) requires a
separate earth ground in addition to
the required equipment ground.
Wallace Perimeter Security recommends grounding the operator with a separate earth ground connected
to a ground rod to assure proper operation and shield it against electromagnetism and other electrical
signals that may cause erratic operation with or damage to the SmartDC Controller.
For earth grounding requirements, refer to the National Fire Protection Association (NFPA) 780 -
Standard
for the Installation of Lightning Protection Systems
, which provides American standards referenced in
Canadian model codes. Highlights of the standard include:
•
The ground rod is a solid copper rod: minimum requirements: 5/8-inch (16mm) diameter and 10
feet (3m) in length.
•
The ground rod is driven into the earth (refer to local codes for proper depth requirements).
•
The ground rod is electrically bonded to the chassis with a single length of unspliced 6AWG copper
wire less than 3 feet (91cm) long.
•
Local jurisdictions may impose additional requirements above the NEC and NFPA 780. Consult the
local codes and regulations regarding requirements in your area.
Take the following steps to comply with NEC and NFPA 780 standards:
1�
Install a grounding rod per local building codes. See Figure 1.
2�
Attach a ring terminal to the earth ground wire (6 AWG) and terminate at the labelled grounding
location in the AC junction box.
If you do not ground the operator with
a separate earth ground rod, you risk
voiding the Limited Warranty.
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