What are the advantages of running electrical cables through PVC conduits in the walls over running in the slab?
Are there any problems which may come up in the future if we run electrical cables conduits in the slab?
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You will have to give wiring conduit in slabs for the fan, and other equipment which is hanging on a slab and it is a general practice, or if there is a false ceiling there will be no need for wiring in the slab, wiring in the false ceiling is more accessible than in slab, but for concealed wiring, it is necessary to run an electric cable from the walls so that it can reach the switchboard. So, there is no such problem if we run it from wall or slab, it is just that it will not be easily accessible.
The main advantage, from my point of view, is that it may so happen that we may want to demolish a wall in the house for what so ever reason, but we can’t dismantle or harm the slab since its a structural member.
The second reason is that a slab may run continuously throughout the structure; hence we can lay straight cables throughout the structure and provide connection where ever required, but in case of walls, we may not find this convenient.
Also, if the walls are periphery or exterior walls, which may be directly exposed to rains, then it may cause Earthing issues.