Power Cord Grounded Plug Wiring Diagram

A wiring diagram is a simplified conventional pictorial representation of an electrical circuit. It shows the components of the circuit as simplified shapes, and the power and signal connections between the devices.
A wiring diagram usually gives information about the relative position and arrangement of devices and terminals on the devices, to help in building or servicing the device. This is unlike a schematic diagram, where the arrangement of the components' interconnections on the diagram usually does not correspond to the components' physical locations in the finished device. A pictorial diagram would show more detail of the physical appearance, whereas a wiring diagram uses a more symbolic notation to emphasize interconnections over physical appearance.
A wiring diagram is often used to troubleshoot problems and to make sure that all the connections have been made and that everything is present.
Architectural wiring diagrams show the approximate locations and interconnections of receptacles, lighting, and permanent electrical services in a building. Interconnecting wire routes may be shown approximately, where particular receptacles or fixtures must be on a common circuit.
Wiring diagrams use standard symbols for wiring devices, usually different from those used on schematic diagrams. The electrical symbols not only show where something is to be installed, but also what type of device is being installed. For example, a surface ceiling light is shown by one symbol, a recessed ceiling light has a different symbol, and a surface fluorescent light has another symbol. Each type of switch has a different symbol and so do the various outlets. There are symbols that show the location of smoke detectors, the doorbell chime, and thermostat. On large projects symbols may be numbered to show, for example, the panel board and circuit to which the device connects, and also to identify which of several types of fixture are to be installed at that location.
A set of wiring diagrams may be required by the electrical inspection authority to approve connection of the residence to the public electrical supply system.
Wiring diagrams will also include panel schedules for circuit breaker panelboards, and riser diagrams for special services such as fire alarm or closed circuit television or other special services.
Wikipedia

Make sure the cord is unplugged from any power source. Cut off the old plug from the cord, using wire cutters. Cut off any damaged portion at the end of the cord. Slide the new plug over the cut end of the cord and out of the way for now.

Three prong extension cords generally come in two wire gauges: 12 and 14. Twelve gauge cords have larger diameter wires and are suitable for heavier loads, such as operating power tools. A 14 gauge cord is suitable for indoor appliances and indoor or outdoor lights. You'll generally find the wire gauge marked on the cord sheathing or on the plug.

Step by Step Guide to Wiring Your Grounded Extension Cord Ends Remove the screw from the top of the plug using the screwdriver. Next, pull on the prongs of the plug to release the plug from its shell. Loosen the set screw on the barrel cord grip.

Power tools, outdoor appliances and some indoor appliances, such as washing machines, have three prong plugs, which means the cords have a ground wire. You can only plug a three prong plug into a three prong receptacle.

A 120 volt electrical cord has three prongs when the cord includes a ground wire. The ground is a safety feature that ensures electricity has a direct path to earth in the event of loose connection.

Open the replacement plug so you can reach the terminal screws inside. Attach each section of exposed copper to the appropriate terminal screw: green wire to the green grounding screw, white (neutral) to the silver screw, and black (“hot”) to the brass screw. Wrap the wire clockwise around the terminal and tighten each screw securely.

On a polarized, grounded cord, the smaller prong connects to hot and the semi rounded pin underneath the two prongs connects to ground. If a three prong plug has two prongs of the same size, the only reliable way to tell which prong is neutral and which is hot is to uncover the wires and check the color of the insulation. White is always neutral.

Match up the power cord with the old plug and follow the wire that leads to the narrow prong. You can also test the device with ohm meter to find which wire connects to the switch. The hot wire should be the switched wire. Slip the wires through the back of the plug and pull them through to the front.

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