Quantcast Bonds and Bonding - hdbk419a_vol20213

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Verify that the ground risers are bonded to the equipotential plane as specified in Section and
that the bond resistance does not exceed 1 milliohm. Inspect to assure that the ground risers are located to
provide the shortest possible lengths to the equipotential plane.
Verify that at least two electrical paths exist between the equipotential plane and the earth
electrode subsystem. Preferably the plane should be bonded to the building main structural steel (or downleads
in wooden buildings) at least every 3 meters (10 feet). Measure the resistance between selected points on the
plane and the earth electrode subsystem to verify that the total resistance does not exceed 5 milliohms. If the
resistance does exceed 5 milliohms check all joints for proper bonding and down hauls for proper sizes. See that
all deficient conductors are replaced and that all poor bonds are redone.
Inspect all conduit metallic pipes and tubes for continuity and bonding as recommended in
Section 1.4.4.
Verify that all electrical supporting structures and cable ways are interconnected and bonded as
recommended in Section 1.4.5.
Inspect the grounding of the electrical distribution system for conformance with Section 1.4.6.
1.13.4 Bonds and Bonding.
In addition to the inspection of structural joints, generally inspect all bonds for proper cleaning,
correct fastening or assembly, and for adequate corrosion protection. Be particularly alert for conformance
with the recommendations of Sections 1.7.1 and 1.7.3.
Perform resistance checks on selected bonds. Use the double balanced bridge method described in
Section  All bonds should exhibit a resistance of 1 milliohm or less; those which do not must be


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