Why do some electrical switches disconnect the phase and neutral wire but some disconnect only one wire ?

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Why do some electrical switches disconnect the phase and neutral wire but some disconnect only one wire ?

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9 Answers

Anonymous 0 Comments

I’m speaking in terms of US code. The neutral, or ground potential current carrying conductor, Shall not be switched.

Anonymous 0 Comments

I’m speaking in terms of US code. The neutral, or ground potential current carrying conductor, Shall not be switched.

Anonymous 0 Comments

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.

Anonymous 0 Comments

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.

Anonymous 0 Comments

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.

Anonymous 0 Comments

I’m speaking in terms of US code. The neutral, or ground potential current carrying conductor, Shall not be switched.

Anonymous 0 Comments

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.

Anonymous 0 Comments

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.

Anonymous 0 Comments

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.