APPENDIX B – GROUNDING GUIDELINES
B-2
Hardware
and Installation User Manual
To achieve low impedance from device to single-point termination, 0.65
centimeter or larger ground braid should be used. A good rule of thumb is to
require less than 0.1 ohm of DC resistance between device and single-point
ground.
This is accomplished by removing the anodized finish and using copper
lugs
and star washers.
B.2.2
Guidelines for Gr
ound Connections
Use particular care when establishing the ground connections. The following
techniques
will help in establishing good electrical connections and increasing
system
noise immunity:
Terminate grounding braid and green wires at both ends with copper
eye
lugs to provide
a good contact surface. Lugs should be crimped and
soldered.
Use #10 copper bolts (or equivalent) for those fasteners providing
electrical connections to the single-point ground. This applies to
device-mounting bolts and braid termination bolts for subpanel and
user-supplied
single points. T
apped holes
for these fasteners are better
than
nut-bolt arrangements.
Paints, coatings, and corrosion can prevent good electrical contact at
ground points. Remove these impediments in the area of contact and
use external toothed lock washers (star washers) to ensure good
continuity and low impedance. This practice should be used for all
terminations — lug to subpanel, device to lug, device to subpanel,
subpanel
to conduit, etc. Examples of ground connections are shown in
Figure B-1.
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