Chapter 1: building and service entrance grounding, Triad” ground rod details fig. 1-2 fig. 1-4, Fig. 1-5 – ERICO Practical Guide to Electrical Grounding User Manual
Page 13: Fig. 1-6
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When “inspection wells” are required to expose points from
which to measure system resistance, several methods are
available. Inspection wells are usually placed over a ground
rod. If the grounding conductors do not have to be discon-
nected from the rod, the conductors can be welded to the
rod, and a plastic pipe, Figure 1-4, a clay pipe, Figure 1-5,
or a commercial box, ERICO T416B, Figure 1-6, can be
placed over the rod.
The plastic pipe also works well when an existing
connection must be repeatedly checked, since it can be
custom made in the field to be installed over an existing
connection. If the conductors must be removed from the rod
to enable resistance measurements to be made, either a
bolted connector or lug may be used (Fig. 1-7).
Chapter 1: Building and Service Entrance Grounding
Bare Copper
Ground Cable
CADWELD Type TA
Connection
Copperbonded
Ground Rod
Typical for 3
CADWELD
Type GT
Connection
Bare Copper
Ground Cable
Scheme 1
Copperbonded
Ground Rod
Typical for 3
CADWELD
Type GT
Connection
Bare Copper
Ground Cable
CADWELD Type TA
Connection
Scheme 2
Copperbonded
Ground Rod
Typical for 3
CADWELD
Type GR
Connection
CADWELD
Type TA
Connection
Scheme 3
At Building Corner
®
“Triad” Ground Rod Details
Fig. 1-2
Fig. 1-4
CADWELD
Type SS
Connection
Where a stranded conductor enters a building
through a concrete wall below grade, a waterstop
may be made on the cable by installing a
CADWELD Type SS on the conductor where it
will be buried inside the wall.
Cut Slots to Match
Conductor Size
and Configuration
PVC Pipe with
Screw End Cap
Fig. 1-5
CADWELD
Type GT
Ground Rod
Connection
1'' Dia. Lift Hole at
Center of Cover
5/16'' Hot Dip
Galvanized Steel
Cover
Grade
Ground Grid
Conductor
12'' Dia.x 24''
Vitrified
Clay Pipe
Ground Rod
Fig. 1-6
GRD TEST
Fig. 1-3
Fig. 1-7
Disconnect for attaching 1 to 8 1” wide lugs.
1-3/4
1-1/4
Rod
CADWELD Connection
B542C003
1/4X3X6-1/2"
Copper
CADWELD Type Gl Lugs
9/16" D.
Grounding Book 4/14/99 10/5/99 6:01 PM Page 5 (Black plate)