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Volcanic neck
Conduit is not required for residential electrical IF THE WIRING IS BEHIND THE WALL. If it's exposed wiring, you'll need to use conduit.
PVC is cheaper but is used differently. PVC is usually baried in ground and emt usually runs exposed. You can use PVC exposed if it is schedule 80 gray PVC electrical conduit. Schedule 40 is for under ground
RSC pipe - Rigid Steel Conduit (RSC) can be installed indoors or outdoors, in dry or wet locations, exposed or concealed, in all kinds of atmospheric conditions, and in hazardous locations.
an exposed conduit used for carrying electrical wires/cables
batholith
Cleat wiring is exposed while in conduit wiring the wires are well protected inside tubes/pipes.
Conduit comes in many styles and is used to run electrical wiring in exposed locations in and around your home. It may be a basement, garage, barn, laundry areas, and also exposed areas.
In the United States, the NEC requires that runs of conduit be continuous and connections be made wrench tight. If done properly this provides added grounding protection to your circuits. If a connection is left loose, that added grounding protection does not exist. There are times when threaded connections simply won't thread completely. This may require that the conduit threads be "run" with a threader to remove whatever is preventing this from happening. With experience you learn what is acceptable or not acceptable. Generally, if the connection is "wrench tight" and is otherwise secure, that is sufficient.
water
The horrifying conditions of Chicago meatpacking industry. It caused the congress to pass the meat inspection act and the pure food and drug act. "The Jungle" exposed unsanitary conditions in the meat
Forest hedgehogs hibernate. However, if Desert hedgehogs are exposed to cold conditions, they die.