This question has probably been asked several time but things change. The house I'm living in now was built in the 1960's and has a ring main using 4mm Flat Twin and Earth. A lot of properties I've noticed have been wired with 2.5mm FTE and both connected through originally a 30amp fuse or more lately a 32amp mcb. My question is what's the maximum amperage that each size of cable can carry?
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How old is this cable, could you post up a picture of it?
At that age it may be imperial sized cable which was physically bigger and the equivalent of modern 2.5mm is physically the same size as modern 4mm
Suggests yes, but doesn't prove it, not all imperial cables were tinned.
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All depends on length of runs and how they’ve been installed
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Is this cable stranded or solid ?
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I would say Solid
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If the wiring dates from the '60s, I doubt if millimetres comes into its size.
Is the metal comprising the wires copper or silver coloured?
Is the metal comprising the wires copper or silver coloured?
Hi the 4mm is stranded.
Copper
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Are you sure it is a RING? It's more likely to be a radial circuit.
No mate, definitely a ring circuit.
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How old is this cable, could you post up a picture of it?
At that age it may be imperial sized cable which was physically bigger and the equivalent of modern 2.5mm is physically the same size as modern 4mm
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He says it's copper coloured, so that suggests metric, in which case it wasn't made in the sixties.
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So there are two conductors in the top of the MCB?
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From that period could easily be copper clad aluminium as the used sizes were 1.5 solid and 4.0 stranded or nearest imperial equivalent.
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Suggests yes, but doesn't prove it, not all imperial cables were tinned.
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