Voltage drop (IEC)

Table G.52.1 – Voltage drop

A – Low voltage installations supplied directly from a public low voltage distribution system: Lighting is 3% and other use is 5%.

B – Low voltage installation supplied from private LV supply* : Lighting is 6% and other use is 8%.

* As far as possible, it is recommended that voltage drop within the final circuits do not exceed those indicated in installation type A.

When the main wiring systems of the installations are longer than 100 m, these voltage drops may be increased by 0,005 % per metre of wiring system beyond 100 m, without this upplement being greater than 0,5 %.

Voltage drop is determined from the demand by the current-using equipment, applying diversity factors where applicable, or from the values of the design current of the circuits.