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Q: What is duct wiring?
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What does loomex cable mean?

Protecting Knob & Tube wires entering a panel, sleeves called "Loom Duct" were used to protect the conductors and held in place with a "Loom Clip". When Knob and Tube wiring was phased out in the late 30's a multi conductor cable was introduced. This cable had paper around each conductor and then enclosed in Loom duct. This new cable was called "Loomex".


Which tape is stronger electric tape or duct tape?

I would say duct tape. Duct tape has considerably stronger adhesive than electric tape. On the other hand, electric tape will stretch when put in tension when duct tape may just tear - so it depends on the type of strength you are looking for.


What is disadvantage to lay power cable in the duct?

If you lay a power cable in a duct, and it overheats due to a short or overload, the smoke from the cable burning will fill the duct and be transported by the duct to places it should not be. If the cable is not balanced, i.e. not paired up with its neutral return, current in the cable will induce a current in the duct via electromagnetic induction, causing heat, loss of power, and potentially fire, even if the original circuit was operating normally. The latter effect is why penetrations for single cables in distribution panels must be slotted, so as to break the electromagnetic field.


Can HVAC duct passing through the electrical room as per the NEC code?

Obviously, an HVAC duct or pipe can pass through an electrical room, as described in the NEC. It cannot pass directly over or under panelboards, and elctrical equipment must be protected from condensation or drips form the pipe or duct.


What is difference between cleat and conduit wiring?

Cleat wiring is exposed while in conduit wiring the wires are well protected inside tubes/pipes.