Ring Main addition-20 or 30 amp junction box?

[Blair]

I am adding two extra double sockets to my kitchen ring main and I was proposing to fit two 20 amp junction boxes to enable me to add the extra sockets. A friend said I should fit 30 amp junction boxes instead of 20 amp Is this essential? So far I have not seen any 30amp boxes in B&Q or Wickes Blair

[Lobster]

I'm surprised - they're readily available: eg

have three terminals; the 20A ones you've seen typically have four, right? (for use with lighting circuits)

David

[Dave Plowman (News)]

30 amp - three terminals instead of four. Your nearest wholesaler will have them and happily serve you.

[Blair]

Lobster and Dave Thanks for your help Blair