ERICO TSG Series Surge Reduction Filters (TSG-RSF) - Manual (Page 21)

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TSG-SRFs on Sub-Circuits
Figure 16. Operation of primary shunt protection
and SRFs on sub-circuit.
6.7 TSG-SRFs ON SUB-CIRCUITS
Where SRFs are installed to protect
equipment on a particular sub-circuit, it
is strongly recommended that additional
protection be installed at the power point of
entry. Primary shunt protection at the point of
entry should be used to divert the peak surge
currents away from the sub-circuit. This will
reduce the risk of cross-coupling of transients
onto adjacent circuits and will reduce the risk
of flashover between the locally grounded
chassis and the earth circuit.
Figure 16 details the role of point of entry
protection in these instances. The cables
supplying the input to the SRF and the
connection to the earthing system will carry
a proportion of the surge energy which has
been let through the primary point-of-entry
protector.
Care should be taken therefore, in the
routing of these cables to ensure that this
energy will not couple onto adjacent circuits.
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