ERICO ISODC Isolated Downconductor System - Manual (Page 15)

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The lower termination of the system should be connected to building lightning protection system (isolated or bonded system) or
standard compliant lightning protection earth termination.
Isolated Downconductor
Lower Termination
Multi-Purpose Clamp
Figure 10. Examples of lower termination connections using multipurpose clamp.
Ex. A Ex. B
Ex. C Ex. D
7. CONNECTION OF LOWER TERMINATION ADAPTER
The ISODC primary equipotential bond is an electrical connection to the ISODC sheath approximately 2.25 m from the upper
termination adapter. This bonding connection is normally provided as part of the factory supplied upper termination of the ISODC. A
4.5 meter length of 6 mm
2 PVC covered conductor is supplied that should be connected to the screw terminal of the primary bond
and routed out the bottom of the Isolated Mast, connecting to the nearest grounded metallic structural point. This conductor should
be cut to length before terminating to the structure.
Bonding
conductor
Screw connector
Primary equipotential
bond
Figure 11. ISODC primary equipotential bond.
The primary equipotential bond is required to maintain the performance of the upper termination. Under lightning conditions the bond carries a
small portion of the discharge current, however this minor current is small enough not to cause damage to the structure. The ISODC primary
equipotential bond conductor should not be directly connected to the lightning carrying circuit (i.e. not to an isolated LP ring).
8. ISODC PRIMARY EQUIPOTENTIAL BOND