Short and simple question. Can anyone explain the difference between SPD's for different earthing systems please.
SPD difference between earthing systems
- Thread starter muffking
- Start date
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SPDs for TT systems contain MOVs and one or more gas discharge tubes. Some of those can be used on TN systems as well.
Some SPDs for TN systems only contain MOVs which are not suitable for TT systems.
Some SPDs for TN systems only contain MOVs which are not suitable for TT systems.
Thanks. Do you know if there is a difference between SPDs for TNS and TNCS on single phase?
Also is there any preference on MCB size below the maximum for SPDs which are not already fused?
Also is there any preference on MCB size below the maximum for SPDs which are not already fused?
TNS and TNCS are identical as far as surge protection is concerned.
If an MCB is required, the size will be specified by the manufacturer.
If an MCB is required, the size will be specified by the manufacturer.
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Thanks. I was looking at Cudis, who say to use up to 63A max. I'll have a proper look at the data sheet to be sure.
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