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Not the building opened in 1976, the wiring code in the US!
Despite being called NEC, it seems it is far from "N".
Different inspectors in different areas may demand certain methods are used over others, ie sometimes receptacles and switches can be "wired through" and other times you have to "pigtail".
Many sockets have two sets of terminals, so you connect one set to one and the other to the other set. But if this is disallowed, you have to join the two together with a third "pigtail", which is bent over and attached to one screw or sometimes the accessory has a terminal similar to ours.
Seems crazy to make life difficult for yourself...or have it made difficult for you by an inspector!
Despite being called NEC, it seems it is far from "N".
Different inspectors in different areas may demand certain methods are used over others, ie sometimes receptacles and switches can be "wired through" and other times you have to "pigtail".
Many sockets have two sets of terminals, so you connect one set to one and the other to the other set. But if this is disallowed, you have to join the two together with a third "pigtail", which is bent over and attached to one screw or sometimes the accessory has a terminal similar to ours.
Seems crazy to make life difficult for yourself...or have it made difficult for you by an inspector!