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Restaurant Kitchen & 3-Phase Oven RCDs

Apostolos
Good morning.

I have a restaurant where according to the kitchen specialist's design we are feeding some 3-phase combi ovens (25Amps) though 32A three phase isolators in series with a 3phase 32A bayonet plugs & sockets.

Cabling in all cases will be SWA/LSF cable.

According to BS7671:2018 / 411.3.3 this is a socket outlet not exceeding 32A and therefor it shall need a three phase RCD 30mA.

Is there any escape from the RCDs in this occasion?

I know that in the past the limit used to be 20A sockets (now it is 32A) and that if it was used for a specific purpose machinery like in this case it could be excluded.

Has this been removed now? I cannot find anywhere the exclusion for special purpose sockets so I guess it has been removed.

Also the fact that we are going to an isolator first does it make any difference?

Thanks
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  • 0
    Catering equipment is often high risk WRT electric shock due to rough usage, poor maintenance and sometimes doubtful quality. I would therefore be very reluctant indeed to omit RCD protection.

    No matter how high standards might be initially, it is likely that a 32 amp socket will be re-used for other equipment within the life of the fixed electrical installation.
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  • 0
    Catering equipment is often high risk WRT electric shock due to rough usage, poor maintenance and sometimes doubtful quality. I would therefore be very reluctant indeed to omit RCD protection.

    No matter how high standards might be initially, it is likely that a 32 amp socket will be re-used for other equipment within the life of the fixed electrical installation.
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