Do not connect both red and black unless you know the fan is wired for. Sheathed cable with a red wire always is accompanied by a black wire a white wire and a bare wire.
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Old house wiring red black white. A ground wire is used as a protective measure. Never attempt to use a black wire as a neutral or ground wire. If you have the previous colours red black and green earth or bare earth very dangerous we would recommend you have an electrician test to check the integrity of the cable as it could be more than 50 years old and unreliable. As hot wires can be connected to each other a black wire can be connected to a red wire. One of the hot wires attaches to a brass terminal on one side of the outlet and the other attaches to a brass terminal on the other side. A white wire may be marked with a piece of black electrical tape at its ends.
If you are writing from north america both red and black are used as hot. The white is always neutral and green or bare is ground. Red wires are usually secondary live wires in circuits. Join the white wires and cap them in the same way but omit the jumper wire. Very old homes may have cable that excludes the bare wire. Red wires are also hot wires.
You should also be looking at the condition of cables as well as the sheathing of the cables. When measured with respect to the white neutral wire the red wire carries the same 120 volt current that the black one carries making the voltage across these two hot wires 240 volts. They should both be of the same wire gauge. That is 120v each between the two is 240v. White wires are always neutral in 110 volt circuits but can be used as the second hot wire or switch leg in 240 volt applications and three way switches respectively. So what they probably did was make a connection with new wire from the breaker panel red black and.
A white wire that has been marked with black means its acting as a hot wire and is no longer neutral. Im trying to understand how to connect a modern switch up in the place of an existing old one and it just isnt making sense to me. Blue and yellow wires are usually live wires as well. Youll have two cables in the switch box a live one with a black and white wire and the one going to the outlet which has a red black and white wire. Identifying house electric wiring colors written by. Ground wires return fault current to earth ground protecting the individual from electrocution.
The wiring in some. Original old house wiring was often red and black with no white wire. Join the black wires from both cables together add a 6 inch jumper cable of the same gauge twist them all together and screw on a wire cap. Green wires are used for grounding and should only be. You might find them on fans or lights where they can assist a multi way switch. When you see either a green wire or a bare copper wire you can be sure it is a ground wire.
My house was built in the 50s with wiring from that time period. 12 awg for 20 amp circuits and 14 awg for 10 and 15 amp circuits. White and gray wires are almost always neutral.
Gallery of Old House Wiring Red Black White
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