What size tails for consumer unit?
What size tails for consumer unit?
Typically a customer can have a 100amp 9 way consumer unit with 25mm tails and an additional single way 40 amp mcb or fused consumer unit tailed with 10mm.
What size are electrical tails?
Although most electricity distributors will agree to their cut-out being used the typical maximum length of meter tails is 2 or 3 meters. Generally installed meter tails are 25mm. A smaller diameter such as 16mm would be permitted providing the cut-out fuse is sized in accordance with section 433.1.
How long can 25mm meter tails be?
3 metres
For connection to the metering equipment you should provide 25mm2 double insulated meter tails for connection into the meter, together with a 16mm2 earth conductor. The meter tails between the meter position and your consumer unit should not be longer than 3 metres.
When can you use 16mm tails?
16mm tails are fine for 60A, 63A & 80A main supply fuses (BS88/BS1361 Type2) 25mm tails are required for 100A main supply fuses.
Can you leave 16mm tails in?
No. If the meter tails to the consumer unit are longer than 3m (or whatever the local DNO specifies), then you must fit overcurrent protection within the first 3m (or the specified distance) cable length, irrespective of the rating for your extended tails, and irrespective of the rating of the DNO fuse.
Can 16mm tails carry 100A?
In some new appartments we’ve nearly completed, the fuse is 80A, yet the tails from meter to isolator (DNO fitted)are 25mm….See Also:
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What amp can 16mm tails carry?
16mm is fine on 80 amp if clipped direct or buried in masonry (method C). In duct, trunking or conduit, it would need to be on a 60amp.
What are 25mm tails rated at?
usually if upgrading a consumer unit you would slap on 25mm tails for good measure as the units are rated at 100amp usually and the fuse may be changed at some point so its sorted… regardless of fuse actually on the cutout…
What load will 16mm tails take?
80 amp
16mm is fine on 80 amp if clipped direct or buried in masonry (method C). In duct, trunking or conduit, it would need to be on a 60amp.
