Generally, black wires are live and white are grounded. However, it's a good idea to test this theory with a multimeter, not your fingers. In a Home/Residential environment, say a 120V outlet, there are three wires. Black is "Live" or "Hot". On an electrical outlet, it's the shorter pin on the right. White is "Neutral" it's the wider pin on the left. Green is always ALWAYS ground and it's the round-ish pin below the two flat pins.
Now, on a 240V outlet, such as an electric dryer, both wires are black, and both are live. This is because the alternating current on each wire is 120V relative to Neutral, but 240V relative to each other. (The voltage is 180 degrees out of phase). Both 120V and 240V are considered "Single Phase" power.
In a DC system, red = positive, black = negative.
A DC system can be negative ground, positive ground or isolated from ground.
So... "live" takes on different meaning, depending on the way a system was engineered.
Most automotive systems are negative ground; haven't seen a positive ground for many years.
Without additional information, you're on your own.
When you encounter a red wire in house wiring, it may be live or may be neutral.
Commonly used in wiring 2-way switched lighting, that red wire in a 4-wire bundle is switched by the 2 switches in some wiring arrangements so that it can be hot with the switches set one way, and neutral with the switches set another way.
In 220v circuits, both the black and the red wire are HOT.
Canada and US - The colour of live wires in home wiring are red and black. The neutral is white. Ground is bare when in a cable set like loomex. Ground is green when associated with fixtures and appliances.
The black wire should be the "hot" conductor and the neutral is the white wire. (assuming it is wired correctly in the panel which it likely is.
Red wire=positive Black wire=negative
Connect the black wire to the incoming hot wire and the red wire to the out going load.
Usually is Black and Red or gray (in old building ). Some time if you see white wire that mark in red or black ( either mark with tape or ink ), it consider live wire. Just to be sure, get the tester and check it everytime you work with electrical wire. Shut off power at the main if you can for extra safety.
3 colors? red black green and yellow? i count 4... red is your active, or live wire. black is return, or negative wire. green is your earthing wire and yellow is more than likely a control, for a switch, possibly a heating fan or towel railing?
Black red and yellow is three-phase. there is no neutral.
Red wire=positive Black wire=negative
Yes, the red wire is a positive wire (+) and the black wire is a negative wire (-) :D
Connect the black wire to the incoming hot wire and the red wire to the out going load.
Usually is Black and Red or gray (in old building ). Some time if you see white wire that mark in red or black ( either mark with tape or ink ), it consider live wire. Just to be sure, get the tester and check it everytime you work with electrical wire. Shut off power at the main if you can for extra safety.
the thermostat has a black(line) wire to it, and a red wire going to it. the red wire then connects to the neutral wire. the black and red are like a leg switch.
The red wire is Positive, (+) and the Black wire is Negative. (-)
3 colors? red black green and yellow? i count 4... red is your active, or live wire. black is return, or negative wire. green is your earthing wire and yellow is more than likely a control, for a switch, possibly a heating fan or towel railing?
Black red and yellow is three-phase. there is no neutral.
red wire connected to live conductor of supply intake,while the white wire connected to neutral conductor or supply and the bare wire connected to the protective earthing of
In household wiring the black or red is active, live, or hot.
In the UK, the old wiring colours were... Live = red, Neutral = black, Earth = green.
The red and black wires are Line wires in a 3 wire service and includes a common (neutral) wire.