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7
Installation and Operating Instructions
nVent ERICO Critec SRFs provide protection for equipment on
TN-C, TN-S, TN-C-S and TT single and three phase systems when
selected, installed and earthed in the specified manner.
The diagrams are provided as a guide to identifying and
distinguishing the distribution system in use. Metering,
over-current protection, and other details have not been shown.
The SRFs are designed to be used in distribution systems that
provide a separate earth and neutral connection. SRFs should
not be used in IT distribution systems. (Refer Figure 7)
As electrical wiring and safety regulations differ from country
to country, it is important to ensure that the installation
complies with all regulations applicable to the location.
Please seek further assistance if uncertain.
Regulations differ between countries. Check compliance with appropiate authorities.
Regulations differ between countries. Check compliance with appropiate authorities.
Figure 5. TT system: A system having one point of the source of energy earthed and the exposed conductive parts of the installa-
tion connected to independent earthed electrodes.
Figure 6. IT system: A system having no direct connection between live parts and earth, but having all exposed conductive parts of
the installation connected to independent earthed electrodes. nVent ERICO Critec Surge Reduction Filters should NOT be used in IT
systems without specialist advice.
4 IDENTIFY THE DISTRIBUTION SYSTEM
