ERICO Practical Guide to Electrical Grounding - Manual (Page 61)

53
extend to each floor (Fig. 3-7). For accessible ground points
at each floor, ground bars provide the ideal solution. They
can be bolted to either the wall or the floor or a long
bus attached to the wall with insulators and mounting
brackets. (Fig. 3-8). On exposed steel buildings, the ground
bars can be welded directly to the steel column (Fig. 3-9
and Fig. 3-10). Cast copper alloy ground plates can be
embedded in concrete structures for attachment of future
grounding conductors (Fig. 3-11 and Fig. 3-12). The plates
are provided with drilled and tapped holes for lug
attachment. When large quantities are required on a job,
they are available with a pigtail already attached from the
factory to reduce field labor (Fig. 3-13). The ground plate
also can be exothermically welded directly to a steel
column where the column is to be fireproofed (Fig. 3-14).
Light duty ground points can be made in office columns
(Fig. 3-15).
In areas where a conductive floor is required, it is bonded to
the ground system as shown in Figure 3-16. In areas where
static electricity must be controlled, metal doors and frames
must be bonded as shown in Figure 3-17. More details on
the control of static electricity are discussed in Chapter 6.
At large facilities having multiple buildings with
underground utilities, the cable racks in the manholes can
be grounded as detailed in Figure 3-18 and Figure 3-19.
Metal handrails should be grounded if there is an accessible
ground conductor available, a good reason to use cast
copper alloy ground plates embedded in the concrete at
frequent intervals. (Fig. 3-20).
Chapter 3: Building Interior Bonding & Grounding
Fig. 3-6
Grounding System Routing
Fig. 3-7
Steel Column
Grounding Stub
See Note
(Alternate Method)
Use Only In Areas
Where Ground Plate
Is Impractical
Bare Copper Ground
Conductor (TYP)
Grounding Plate - Wall Mounted
CADWELD B1642Q
Floor Grade
Alternate Method-
Floor Mounted
Waterproof Membrane
To Station Ground Grid
Grade
CADWELD
Exothermic
Weld (TYP)
Note: Loop 5 Feet Above Concrete Surface For Ground Stub Field
To Provide Adequate Protection Against Damage During Construction.
L C Of Column
Exothermic Ground
Connection,
CADWELD Type VS
BARE Copper Grounding Cable
Rebar
This Rebar Is On The Far Side
Of The Footing CADWELD Type RD
Connection To Rebar,
Two (2) Connections
Per Cable.
To
Ground
Loop
Grounding Book 4/14/99 10/5/99 6:01 PM Page 53 (Black plate)