At a construction site, if you are running a set of lights, as a branch circuit, which are spliced into Type NMC, ROMEX, how often do you need to support the temporary wiring runs on insulators?
Non metallic sheathed cable (type NMC, ROMEX) are flexible and not very expensive also its installation is quite easy, so it is common wiring method at construction sites as branch circuits, because the physical protection it provides to the conductor is minimum its installation restrictions are very strict. hence the need to support the temporary wiring runs on insulators is as following
1) it should not to be used for more then 600 volts
2) it should only be used during maintenance purposes of structures or building.
3)it should not to be used more then 90 days. in a stretch
4) no branch circuit conductor should be laid on the floor.
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