Problem !!! Hope someone knows where to find this out.
Got a SWA 4-core ( assume that the conductor size is in excess of 100mm2 ). It connects to a metal bus-bar chamber. The armour is acting as the CPC.
The chamber has no earth bar but has a earthing bolt, and relies on the casing to act as the protective conductor from the chamber to associated fused isolators all mounted on a steel framework.
What SIZE earthing conductor should be installed linking the gland of the incoming SWA to the earthing bolt within the chamber ???????
Should a earthing conductor also be installed between busbar chamber and each of the fused isolators - how can I verify that the chmaber and steel framework has a cross-sectional area that is acceptable for the incoming cable size and the fuse rating ?
Does any know where to find out such information ????
