Bonding
of lightning down conductor and earth electrode
Ref: NEC 250.106 and NFPA 780 section 4.14.
·
The electrical system and
communications grounding electrodes, along with all incoming or exiting
metallic piping in the earth must be bonded to the lightning-protection
grounding electrode system.
·
Connections between the down
conductors of lightning arrester and grounding electrodes may be made by
bolting, brazing, and welding or high compression connector.
 |
| earthing at telecom, data center, computer network |
·
Clamps suitable may also be
used.
·
Where more than one utility exists
at a building or structure, they shall be effectively bonded together to form a
common grounding electrode system and the MGB (main grounding bus bar). For example: a metallic underground water
pipe, the metal frame of the building or structure, concrete-encased electrode,
a ground ring conductor encircling the building or structure, rod or pipe
electrodes and lightning electrodes etc. (Ref: NFPA 70-2005).
Resistance value:
equal or less than 5 ohm
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