Why do some electrical switches disconnect the phase and neutral wire but some disconnect only one wire ?
In: 8
I’m speaking in terms of US code. The neutral, or ground potential current carrying conductor, Shall not be switched.
I’m speaking in terms of US code. The neutral, or ground potential current carrying conductor, Shall not be switched.
Because with 3 phase you can use only 1 neutral wire for 3 live wire. So you cut both the neutral and live to be sure you don’t have residual current on your neutral wire that could come from the other phase.
Because someone got lazy and didn’t need it inspected.
You are only supposed to switch the power. it goes power->switch->outlet/fixture, never power->fixture->switch.
If you put power on the fixture and switch the other side, your fixture is always sitting at 120/240V and is a hazard. Power then switch means you can turn power off and the fixture is now at 0v and safe to handle.
Because someone got lazy and didn’t need it inspected.
You are only supposed to switch the power. it goes power->switch->outlet/fixture, never power->fixture->switch.
If you put power on the fixture and switch the other side, your fixture is always sitting at 120/240V and is a hazard. Power then switch means you can turn power off and the fixture is now at 0v and safe to handle.
I’m speaking in terms of US code. The neutral, or ground potential current carrying conductor, Shall not be switched.
Because someone got lazy and didn’t need it inspected.
You are only supposed to switch the power. it goes power->switch->outlet/fixture, never power->fixture->switch.
If you put power on the fixture and switch the other side, your fixture is always sitting at 120/240V and is a hazard. Power then switch means you can turn power off and the fixture is now at 0v and safe to handle.
Because with 3 phase you can use only 1 neutral wire for 3 live wire. So you cut both the neutral and live to be sure you don’t have residual current on your neutral wire that could come from the other phase.
Because with 3 phase you can use only 1 neutral wire for 3 live wire. So you cut both the neutral and live to be sure you don’t have residual current on your neutral wire that could come from the other phase.
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