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Switch the main breaker off. If there are two wires dangling from a ceiling rose identify the cables first. The two wires that come down to the switch from the hot leg powering the light itself. Turn off breaker to the switch. For smart switches that function without a neutral wire a home hub is essential. This is likely because ground wires are intended for only temporary use and if a ground wire becomes energized a breaker should trip shortly afterwards. However if you need to rewire a light switch or a plug socket you may occasionally come across two black wires. This fluctuation causes the wires to slightly expand and contract and over time the connection gradually becomes loose. They relate to safety and should be corrected. Once in an awhile if the connection becomes loose enough you may hear a.
Another black wire might be a hot return from a switch that was served with a red and black wires.
The circuit s neutral wire is in the junction box holding the light fixture. The neutral carries current if the loads on each. The hot goes to the other pin via your new switch. This is likely because ground wires are intended for only temporary use and if a ground wire becomes energized a breaker should trip shortly afterwards. A second exception to the one wire per terminal rule is that two or sometimes three ground wires can be secured at one terminal but it is dependent on the manufacturer s installation instructions and the wire size. If there are two wires dangling from a ceiling rose identify the cables first.
They relate to safety and should be corrected. For smart switches that function without a neutral wire a home hub is essential. Once in an awhile if the connection becomes loose enough you may hear a. It sounds like you are about to make an expensive and dangerous mistake. The circuit s neutral wire is in the junction box holding the light fixture. Connect all the white wires together with a new wire nut. The hot goes to the other pin via your new switch. In the us black is hot or live. Switch the main breaker off. A meter can identify the voltage but might not be more useful.
Roy long s answer is technically correct however. This fluctuation causes the wires to slightly expand and contract and over time the connection gradually becomes loose. The united states has strict codes relating to home wiring including clearly defined colors on the outer casing of the wires. For smart switches that function without a neutral wire a home hub is essential. Connect the black wires to the line and load terminals. They relate to safety and should be corrected. Connect the short white pigtail wire to the neutral terminal. Please read this long answer to understand why. If you are in the uk or india black is neutral. Connect all the white wires together with a new wire nut.
In the us black is hot or live. If you are in the uk or india black is neutral. This fluctuation causes the wires to slightly expand and contract and over time the connection gradually becomes loose. Connect the black wires to the line and load terminals. A meter can identify the voltage but might not be more useful. Connect the bare copper or green wire to ground terminal. In a three phase linear circuit with three identical resistive or reactive loads the neutral carries no current. However if you need to rewire a light switch or a plug socket you may occasionally come across two black wires. Connect all the white wires together with a new wire nut. It s essential that you determine which black wire is hot before proceeding.
The magnitude of the current in the neutral equals that of the other two wires. The united states has strict codes relating to home wiring including clearly defined colors on the outer casing of the wires. The easiest and safest way is to use a multimeter to test for current. Use a phase tester screw driver to identify the hot. This is likely because ground wires are intended for only temporary use and if a ground wire becomes energized a breaker should trip shortly afterwards. If one of the black wires is hot and the other is known to feed other receptacles or switches on the same circuit you may join the two black wires and connect via a pigtail to the new receptacle and of course do the same with the two white wires. The neutral carries current if the loads on each. The two wires that come down to the switch from the hot leg powering the light itself. Connect the black wires to the line and load terminals. A meter can identify the voltage but might not be more useful.
The neutral carries current if the loads on each. The easiest and safest way is to use a multimeter to test for current. They relate to safety and should be corrected. But the missing bond on the black side means you should verify that one pair of wires black and white feeds. For smart switches that function without a neutral wire a home hub is essential. Another black wire might be a hot return from a switch that was served with a red and black wires. In a three phase linear circuit with three identical resistive or reactive loads the neutral carries no current. The hot goes to the other pin via your new switch. The united states has strict codes relating to home wiring including clearly defined colors on the outer casing of the wires. Make sure the second black is not hot.
