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16mm meter tails, long run

Discuss 16mm meter tails, long run in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

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Darren Stevenson

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Hello all,

I am working on a property & they need the consumer unit changed.
The slight problem i have is the tails are on 16mm. But the meter is approx 10-12m (tail length) from consumer unit location. Is this length permissible.
There is a KMF at the meter but the customer does not want the tails changed to 25mm as they run under floor.
They now want to get a fully electric Range cooker.
 
As long as your maximum demand for the installation is unlikely to be greater than the ccc of the existing tails and the fuse in the switch fuse, then I see no problem provided the tails also satisfy the requirements for fault/overload protection
 
Irrespective of the dno fuse, if there is switch fuse 16mm tails will be sufficient

Ignore the pretty pictures in the OSG as they are misleading

What do you calculate the maximum load to be?
 
Darren Stevenson said:
Hello all,

I am working on a property & they need the consumer unit changed.
The slight problem i have is the tails are on 16mm. But the meter is approx 10-12m (tail length) from consumer unit location. Is this length permissible.
There is a KMF at the meter but the customer does not want the tails changed to 25mm as they run under floor.
They now want to get a fully electric Range cooker.
Click to expand...
Meter tails should be 2/3 metres max
 
Baddegg said:
Why? So long as an isolator is fitted and the calcs are good....
Click to expand...

Incorrect, an isolator makes no difference, meter tails should be no more than 3 metres (subject to DNO requirements) before connecting to the consumers first CU, DB or switch-fuse/fused switch.

In the OP's case the meter tails connect to a switch-fuse then insulated and sheathed singles run from there to the CU.

Meter tails are the cable(s) which connect the meter to the consumers installation, not any specific cable type although insulated and sheathed singles are often referred to as tails.
 
davesparks said:
Incorrect, an isolator makes no difference, meter tails should be no more than 3 metres (subject to DNO requirements) before connecting to the consumers first CU, DB or switch-fuse/fused switch.

In the OP's case the meter tails connect to a switch-fuse then insulated and sheathed singles run from there to the CU.


Meter tails are the cable(s) which connect the meter to the consumers installation, not any specific cable type although insulated and sheathed singles are often referred to as tails.
Click to expand...
Poor terminology on my part....switched fuse isolator I should’ve put
 
The initial question is regards meter tails and excessive length

A later post then says there is a Kmf which feeds the dist board at the meter position:)
There seems to be a bit of a mixing of your lager and Beer bottles somewhere along the lines :cool:
 

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