You use a known ground and check them for voltage. You can use an extension cord to reach from a ground to the wires you are testing. You are not putting it in an outlet, just to connect you to a ground.
No offense, but if you can't figure out how to make your own 4 wire extension cord out of a 5 wire cable you really shouldn't do it yourself. Go buy a book. Please. I will give you a hint though. Both ends of the cord are wired the same way.
in back of dryer u should have a block with three wires 2 blacks 1 green the one u are trying to wire up should have 2 black 1 green 1 white the white and green wire go in the midle post of the block on the dryer and the other 2 wires go to the out side posts of the block
A four blade dryer plug cord should have a red, black, white, and green wire in the cord set. The red and black wires are the ones that deliver the 240 volts to the dryer. Black and white deliver control 120 volts to the dryer and also drive the motor to turn the dryer drum. On some dryers they use the red and white for the motor and black and white for the control. As for the green it is always the ground wire.
The most common wire size for an extension cord to use would be a #14 conductor. As extension cords are classed as flexible cords, the proper terminology would be a 3C/14. The cord consists of three #14 conductors, whose colouring is white, black and green covered by a plastic sheath.
buy a new extension cord
You can rewire your extension cord by replacing the existing wire with green, black and white wires. In most situations it is safer and cheaper to buy a new extention cord.
Yes, the green conductor is the colour of the ground wire in an extension cord. The black wire is dedicated to be the "hot" and the white conductor is the neutral.
When flexible cords are talked about the ground wire is in the conductor count. A four wire cord will have black, red, white, and green coloured wires in the flexible cable set. A three wire cord will have a black, white and green coloured wires in the cable set. To use a four wire cord to carry 220 volts just use the black, red and green wires. Connect to the cord ends. Black and red to the outside blade terminal screws and the green wire to the green ground screw. To use a three wire cord to carry 220 volts just use all of the wires. Black and white to the outside blade terminal screws and the green wire to the green ground screw.
On a 3 wire dryer cord there is no green wire. The white wire coming from the outlet is connected to ground or the green screw. The black and red wires are the hot wires.
The wire that is hot on an extension cord is typically the black wire.
No, but it is a waste of money when you only need three of the four wires when making an extension cord. If you are constructing an extension cord make sure that the ends go to the right end of the cable. Match the wire end when looking at it, to the proper pin configuration of the plug. White to silver, black to brass and green to green terminal. Looking at the end of the cable, it should be matched the plug configurations. On the plug end the wire should match the cable. If it doesn't look at the other end of the cable. No wires should cross when connecting to the blades on the plug, If they do you have the wrong end of the cable.
It depends on the extension cord but I will give you 2 ways and they are each very simple. On a residential type (what I call a house burner) extension cord with just 2 conductors, you will find that the jacket of one wire is smooth and the other one has ridges. The one with ridges is your neutral or white conductor. On a more commercial type extension cord with conductors covered by a protective jacket, your conductors in the cord will be color-coded, with black being hot, white being neutral and green or bare being ground.
You use a known ground and check them for voltage. You can use an extension cord to reach from a ground to the wires you are testing. You are not putting it in an outlet, just to connect you to a ground.
No offense, but if you can't figure out how to make your own 4 wire extension cord out of a 5 wire cable you really shouldn't do it yourself. Go buy a book. Please. I will give you a hint though. Both ends of the cord are wired the same way.
To safely rewire an extension cord, first unplug it from the power source. Cut off the damaged part of the cord and strip the insulation from the wires. Connect the wires to the corresponding terminals in the new plug, ensuring they are securely fastened. Use electrical tape to cover the exposed wires and terminals. Test the cord before use to ensure it is working properly.
Depending on the configuration of the cord cap, the green wire is ground, the white wire is the neutral and red and black wires are the 220 volt source.