1 Temperature of conductor 70~90℃
2 Environmental temperature 40℃
3 Cable layout (single core)
S=2D
4 Power factor:cosθ=0.8
5 Voltage fall percent allowed at the termiral≤5%
6 Vd means Voltage fall:
Vd=K×I×L×V0(V)
I: Working current or counting current(A)
L: circuit length(m)
V0: Voltage drop inside the meter (V/A.m)×10-3
K: Three-phase four -wire k=3
single phase k=1

Voltage fall allowed during sinle phase: Vd=220V×5%=11V
Voltage fall allowed during three-phase: Vd=380V×5%=19V

Suit to the development of the mansion buildingand the valuable suggestion by vast electric designerprovided. On the base of single are prfabricatedbrach cable. We also create successfully the multicoerprefabricated branch of 3-phase,4-wire.
The outside diameter of the multicore cable is long .The weight is heavy.So the outside diameter is more longer when it is made prefabricated branchcable so that it will cause to lay difficulty,so the big-gest multicore prefabricated branch cable is produced by our company at now is limited 120mm2 andbelow.There has fire-retardant model,fire-tolerant model,equivalentsection and non-equivalent section.
At now the branch wire of the multicore prefab-ricated branch cable is only one class section in aloop.If it was adopted the branch wire of the differentsection.It will be adopted single-core prefabricated branch cable.The ampacity of the multicore prefab-ricted branch cable is identical to the multicore.The means of installing is similar to that of the mulricore cable.