ERICO TSG Series Surge Reduction Filters (TSG-RSF) - Manual (Page 22)

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TSG-SRFs on Sub-Circuits
Figure 17. Earthing of an SRF remote from MEN point. (Subject to compliance with relevant
national standards). Care is needed to avoid earth loops within protected environment.
In some instances it will be necessary to
provide a separate earth electrode for the SRF
(subject to compliance with relevant wiring
regulations), particularly where the filter is to
be installed on a sub-circuit some distance
from the existing earth electrode. In this
instance, the new electrode should be located
as near as possible to the SRF. This secondary
electrode must be electrically bonded to the
existing earthing system via the most direct
route possible, using flat copper tape and
should be buried to an appropriate depth. This earthing arrangement is depicted in
Figure 17. If a secondary earth cannot be
installed, or the earth impedance through the
sub-circuit to the earth is significantly above
10Ω, special care must be taken. The risk of
flashover between the locally grounded
chassis and the earth circuit may exist.
Careful attention must be paid to equipotential
bonding of the protected equipment.
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