Use With Overvoltage Category - dehn DEHNrecord SD Manual

6. Mounting
6.3 Use with overvoltage category IV
Basically, the current and voltage measuring inputs of the DEHNrecord SD are designed for measuring category 300 V CAT III
according to EN 61010-2-030.
This measurement category includes corresponding test levels (4 kV) for overvoltage category III at 300 V according to EN 60664.
If the DEHNrecord SD is located in the protected area of a surge protective device (SPD), it can also be used in
overvoltage category IV. The SPD must limit the overvoltages to a level below 2.5 kV.
The SPD must have an optical defect indicator and should be in the same field of view as the DEHNrecord SD.
Within the protection range of the SPD, the measurement category 300 V CAT III is achieved for the current and
voltage measurement inputs of the DEHNrecord SD.
The safety instructions from chapter 2 must be observed!
It is recommended to monitor the functionality of the lightning current arresters and surge arresters used
(e.g. DEHNventil, DEHNvenCi, DEHN shield, DEHNvap, DEHNguard, etc.).
See the example monitoring of the FM contact on the following pages in chapter 7.1 and 7.2.
Current measurement with DRC SD SCS 100 split core current sensors (Part No. 910 936) under CAT IV conditions:
These can be used if the protection of the SPD also applies to the current conductors on which measurements are made.
Current measurement with DRC SD RCS 1000 Rogowski coils (Part No. 910 937) under CAT IV conditions:
These can be used up to 600 V CAT IV.
The protection of the SPD does not necessarily apply to the current conductors on which measurements are made.
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