The answer is (b) Rigid-metal
If you are installing a conduit for a mast service, the type of conduit to be used should be a rigid metal type. Among the three types of steel conduit, the most preferable to install is the rigid metal type instead of an intermediate metal conduit and electrical metallic tubing. Rigid metal conduit is a ferrous metal.
Answer:
Well the background sound is the sound of course in the background and the nat sound is the curremt sound
Explanation:
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