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Christian McArdle
 
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Default Case of the unknown circuit

6A - unknown.

TV booster? Disused lighting circuit?

Possibly maybe it had some lights on it once. When a persistent short meant
it could no longer be used and the short could not be located, those lights
were transferred to the other lighting circuit.

Christian.

P.S. Your immersion shouldn't be off the ring main, although you'll get away
with it if you don't actually use it much. Unfortunately, as a back up it is
the worst possible situation, as you'd probably need that ring main for fan
heaters if your boiler goes t-u.

P.P.S. 16A is normally considered too much for a lighting circuit. Many
fittings are required to be fused at 10A (or even 6A).