Grand Housing Development Program Volume III - Gtz

DETAIL DRAWINGS FOR ELECTRICAL INSTALLATIONPlanning the electricalinstallationWhen planning electrical, wastewater / fresh water installationsand other installations as telecommunications,all pipes, conduitsand cables have to be consideredin their 3-dimensional spacial locationsand have to be coordinatedto prevent intersections or overlapsof pipes or conduits.For the electrical installation, properplanning is needed to ensurethe correct assignment of switchesto lighting fixtures or other fixturesthat should have switches.Lighting fixtures, sockets and otheroutlets for additional installationshave to be reasonably grouped toelectrical circuits. A dry and centrallocation for a fuse box has to beplanned according to the interiordesign.Cables have to be protected formoverload by fuses. Cables’ dimensionsand fuses’ specificationshave to be defined by the electricalengineer according to the designof the circuits.All installations have to be connectedto earth for safety. Therefore allcables, for example PVC sheathedcables, have three conductors.Wiring with live, neutral andearthed cable within conductors- one live, providing power- one neutral- one earthedConduits enable a system to be rewiredwithout damage or interferenceof the fabric of the building.The cables used within conduitsare usually insulated only, whereasin non-rewireable systems thecables have a protective outersheath.The live, neutral and earthedcable seen at a conduit’sconnection boxIn some cases, i. e. for lighting,only the live and neutralcable is needed.Drawing of the ground floor, showing switches, sockets and the assignments of cables and conduits40Addis AbabaCity Government