In which conditions is the use of conduit unnecessary?

The use of conduit is generally unnecessary in dry locations where the cable will not face damage because, in such environments, the risk of physical harm to the wiring is minimal. Conduit serves primarily as a protective measure for cables against physical damage, moisture, and other environmental factors. If the location is dry and there is little to no chance of the cable being compromised, then using conduit becomes redundant, allowing for a more straightforward wiring method such as direct installation or the use of cable trays.

Other options imply conditions where conduit might be required or are too broad. For instance, using conduit only in commercial buildings does not consider residential applications where conduit may also be unnecessary. Similarly, low voltage locations can still have specific installation requirements that dictate the use of conduit. Finally, the idea that conduit can be omitted in places with no circuits is misleading, as conduit may still be necessary for future installations or safety reasons, regardless of current circuit needs.