Can anyone point me to a source of meter tails bigger than 35mm? I'm having a three phase 160amp per phase supply to a workshop, need probably 50mm tails (anyone able to confirm??) but no one seems to stock it. Any pointers gratefully received.
AWEM
Meter tails bigger than 35mm
Dec 19, 2008
9 Replies
TLC will supply it in cut lengths - but to order as branches don't stock it.
Table 4D1A, 70 deg. PVC singles, Ref. method F (free air or perforated tray), 3-phase, cables touching in trefoil formation:
- 35 mm^2 - 137 amps
- 50 mm^2 - 167 amps
- 70 mm^2 - 216 amps.
Try the more industrial orientated wholesalers like Newey & Eyre or CSE
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perforated
Andy thanks for that. Is there a derating factor as its in 100mm square pvc trunking or does that count as free air?
AWEM
You'll be needing 70 mm^2 then...
Table 4D1A, ref. method B (enclosed in conduit or trunking on a non-thermally-insulating wall), 3 or 4 cables 3-ph AC:
- 35 mm^2 - 110 amps
- 50 mm^2 - 134 amps
- 70 mm^2 - 171 amps
- 95 mm^2 - 207 amps
City Electrical Factors.
Thanks Mark, TLC have got them for me - should arrive Mon/Tuesday - ended up having to use 70mm
AWEM
Good luck bending the buggers ;-)
Linesmen used to use extra large ring spanners[1] to get sets into the Henlite[2] cables for connection onto pole transformers.
[1] 3/4 x 7/8 whit from memory [2] Trade name, insulated and sheathed Ali cable, largest size used to be 120mm² I think.
I've got a piece of 150mm² here (11kV)... It's only 14" long so you can't get much leverage, but might as well be rock solid (overall dia = 31mm).
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