3 phase cooker - idiot check

[happysteve]

I'd appreciate a quick sanity check, thanks in advance:

New circuit for a 3 phase cooker, in a community centre (run by a charity). Total load 16.5kW: L1 27A, L2 27A, L3 15A. (6kW oven, 6 hotplates: 3x 2kW, 3x 1.5kW).

Commercial setting so no diversity: 3x 32A OCPD. (?)

TN-C-S, so Zs presumably ok (will check Ze + calculate likely Zs, obvs).

No additional protection required for cable run - will probably be SWA (outside chance of singles in trunking/conduit) to local 3P+N 32A rotary isolator, then hardwired in 5C H07RN-F.

Not in a special location.

There is no mention of RCD or additional protection in manufacturer's instructions: nothing about it being required or recommended. Just says, "Must be earthed."

In theory, 3P+N RCBOs are available for the DB (MEM3). But would you?

Thanks all

 

[davesparks]

I see no need for 30mA RCD protection from what you have described.

You say 3x32A OCPD? That should be 1x 32A TP OCPD rather than 3x (assuming it's an MCB and not fuses)

 

[happysteve]

I see no need for 30mA RCD protection from what you have described.

You say 3x32A OCPD? That should be 1x 32A TP OCPD rather than 3x (assuming it's an MCB and not fuses)

Thanks
Yes, of course, a 3P MCB... just didn't get the terminology correct.
Many thanks for the reply