On Jan 26, 12:29*pm, "AL_n" wrote:
I have purchased a 20A immersion heater switch *with no paperwork included.
Can someone advise me how to wire it?

Looking at the back of the switch there there are three terminals on the
left side:
Earth,
L2
L1.

On thr ight side, there is:

Earth
N2
N1

Which wires from the two 3-core cables (mains feed cable and immersion
heater cable) go where?

Thank you.

Al

L1 - should be the live supply
N1 - neutral supply
L2 - switched live
N2 - switched neutral
All protective earth wires are permanently bonded together. There
will be seperate earth bonding points so as to enable solid core
connection from the supply and flexible wire connection to the tank.
The permanent conducter between the two earth bonding terminals is not
always completely visible (or at least not obviously).