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Answer :
C. EMT is common for indoor electrical work, RMC and PVC are used outdoors for corrosion resistance and durability, and FMC is used for flexibility. The statement about high-voltage wires being wrapped in insulating material is false; they are bare and insulated by air. Transformers come in different configurations including air-core, iron-core, tapped, and auto-transformer.
The type of conduit mostly used on transformers and in general purpose electrical work is dependent on the specific application and environmental conditions. Electrical Metallic Tubing (EMT) is commonly used in indoor environments because it is lightweight, easy to install, and provides good mechanical protection. For outdoor applications, or where superior corrosion resistance is needed, Rigid Metal Conduit (RMC) or PVC may be more appropriate. RMC is galvanized steel tubing with threaded connections, which make it sturdy and suitable for exposed locations. PVC conduit is non-metallic, corrosion-resistant, and is suitable for direct burial or exposed applications. Flexible Metal Conduit (FMC) is another option often used for its flexibility and protection of wires in tight spaces and in motors or equipment that may move or vibrate.
Regarding the statement about high-voltage wires, it is false. High-voltage wires connected to metal-frame towers use insulating connectors to hold the wires aloft, but these wires are not wrapped in insulating material. Instead, they are bare and the air around them acts as insulation.
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