ERICO Practical Guide to Electrical Grounding - Manual (Page 14)

When the required resistance is not achieved using the
usual grounding layouts, ERICO prefabricated wire mesh
can be added to lower the overall grounding impedance
(Fig. 1-8). ERICO offers a complete line of prefabricated
wire mesh products in sizes ranging from No. 6 to No. 12
AWG solid conductors. Another method which can be used
to lower the grounding system impedance is ground
enhancement materials. These materials can be added
around ground rods or other conductors to enhance system
performance. See the discussion on GEM™ on page 14 and
see Fig. 1-9, Fig. 1-10 and Fig. 1-35.
The National Electrical Safety Code (NESC) recommends
that where fences are required to be grounded, such
grounding shall be designed to limit touch, step and
transferred voltages in accordance with industry practice.
The NESC requires that the grounding connection be made
either to the grounding system of the enclosed equipment or
to a separate ground. In addition, the NESC in Section 92E,
lists six separate requirements for fences:
1. Where gates are installed, the fence shall be
grounded at each side of the gate or similar opening
(Fig. 1-11).
6 Practical Guide to Electrical Grounding
CADWELD Connection
CADWELD Connection (Typical)
Ground bushing
Copper Ground Conductor
in 1 Inch Conduit
Grounding Bushing
CADWELD Connection (Typical)
ERICO Pipe Bonding Strap
(Locate Within 5 Feet of
PipeEntrance Into Building)
3 Inch or Larger
Metal Cold Water
Pipe, 10 Linear Feet
Minimum Undergroung
in Direct Contact with
Earth and Electrically Continuous
to Bonding Connection in
Accessible Location
Neutral Bus
Grounding Bushing
with Bonding Conductor
Same Size as Grounding
Electrode Conductor
Copper Ground
Conductor in Conduit
Equipment Ground Bus
Enclosure
CADWELD Connection (Typical)
Concrete Pad
CADWELD
Connection
Asphalt
Pavement
Copper
Bonded
Ground Rod
Conduit Grounding Bushing
ERICO GEM
Ground
Enhancement
Material
Fig. 1-10
Fig. 1-8
Fig. 1-9
ERICO GEM
Ground Rod
Grounding Book 4/14/99 10/5/99 6:01 PM Page 6 (Black plate)