Lead Sheathed Wiring

Lead Sheathed Wiring Points : lead sheathed wiring This type of wiring employs conductors insulated with VIR and is covered with an outer sheath of lead-aluminum alloy containing about 95% lead. This metal sheath gives protection to the cable from mechanical injury, dampness and atmospheric corrosion. The whole lead covering is made electrically continuous and is connected to earth at the point of entry to protect against electrolytic action due to leakage current and to provide safety against the sheath becoming alive. The cables are run on wooden batten and fixed by means of link clips as in TRS wiring. The greater part of the cable employed is flat twin (the cable having two insulated conductors side by side covered with red and black tape respectively and under one flat covering of lead alloy). Three-core flat is also used in certain cases as well as single cables under a circular sheathing of lead-alloy. Wiring with twin core cable makes the neatest job, and therefore one of the methods of looping.