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Do you have to run wiring in conduit if its in the ground?
Wire in conduit for underground feeders has to have an insulationrating for wet and damp locations. In the marketplace there is also wiring thathas an insulation rating for direct burial that does not need to be installed into conduit.
When installing surface mounted cable the best method of ensuring that it is kept straight is by?
When installing surface mounted cable the best method of ensuring that it is kept straight is by using more fasteners that is required by the electrical code. Another way is to install it into a conduit chase. The conduit can be fastened to the building using a level to keep it straight. The cable can then be pulled into the conduit.
What are the methods of laying in or drawing cables into conduit trunking and traywork systems?
Me, personally i use a horizontal bar above the area you are installing the cables into it is a lot easier than straight off of the floor...if the cable seems to tighten on the pole then just simply sprinkle some talk on it:)
Is it legal to support a conduit from another conduit of the same size?
No, the conduit has to be supported individually from a supportive structure. The spacing of the strapping is related to the size of the conduit.
What is the different between steel conduit over plastic conduit?
Steel conduit weighs more, provides more protection, and costs more than plastic conduit. Plastic conduit weighs less, is easier to work with, and costs less than steel conduit.
