BS1363 are not designed to supply 16A nominal for the duration
required by a kiln, it will damage plug, socket and wiring.

If there are spare ways in the workshop CU...
- Fit 16A RCBO (or 16A MCB if RCD supplied)
- Fit an Interlocked 16A BS4343 230V Socket
- Supply it by 2.5mm cable

If there are no spare ways in the workshop CU...
- Fit a larger CU
- Follow the above


Source of Interlocked 16A BS4343 230V Socket...
- www.discount-electrical.co.uk
- Gewiss Eurobloc Blue Compact Fixed Interlocked Socket 2P+E IP55 16A
230V
- GW66448
- £12.54 ex VAT, plus about £7 carriage, plus VAT

Perfectly ok, cheaper than Mennekes/MK etc which will be £80-140.


Why Interlocked...
- BS4343 are unshuttered sockets, that means a child can easily poke a
nail into a live contact unlike a domestic BS1363 shuttered sockets
- Anyone can unplug under load which will flash (arc) on 32A-63A-125A
- Interlocked means the power can not be turned on without a plug in,
and the plug can not be removed without turning the power off
- The downside is the cost, however the Geweiss above is reasonably
priced


There are BS4343 Interlocked Sockets which have a DIN rail so you can
fit a 16A MCB (or 16A RCBO or 16A MCB & RCD) permitting supply from
any other suitable final circuit - but they are physically large and
expensive. Supplying a 16A heating device off a ring is less than
ideal, although for a workshop without several fixed power tools on
the ring it should be ok. Just a DIN rail Interlocked Socket is an
expensive solution - cheaper to change a CU enclosure if no space.
NOTE most waterproof CU (eg, MK) do not take RCBO - you have to use
RCD with MCB, conventional non-waterproof CU (MK Sentry) will take
RCBO without problem.