Electrical Control Using Relay Contactors
How Relays Control Electrical Equipment – Contactors or relays are used for operating several electrical devices, including equipment such as well pumps, septic pumps, basically any type of electric motor.
Relays and Contactors for Controlling Electrical Equipment
Electrical Question: In our new church building, there is a metal box mounted beside the electrical 300 amp service box labeled “CONTACTOR”. What is the purpose of a contactor ?
This electrical wiring question came from: Tim, a Homeowner from Johnstown, Ohio.
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Additional Comments: Great site ! Very easy. Very Clear.
Thanks for your electrical wiring question Tim.
How Relays Control Electrical Equipment
Tim, the word contactor in electrical terms refers to an electrical relay. Contactors or relays are used for operating several electrical devices, including equipment such as well pumps, septic pumps, basically any type of electric motor. Contactors are also used for operating lighting, such as parking lot lights. Contactors generally have a control circuit which can be operated by a manual switch or by an automatic operating device such as a photo cell, time clock, or a programmable controller. The control circuit is usually a lower voltage and a separate circuit from the equipment that is being controlled by the relay or contactor.
The Following will assist you with your electrical question:
Electrical Relay Articles
This section will cover the use of relays that are sometimes needed to control special device loads such as Air Conditioners and other high demand equipment from starting at the same time.
You identified your project to be about Wiring Diagram, so you might find this information useful:
Home electrical wiring diagrams are an important tool for completing your electrical projects. An electrical wiring diagram can be as simple as a diagram showing how to install a new switch in your hallway, or as complex as the complete electrical blueprint for your new home or home improvement project.
Be Careful and Be Safe - Never Work on Energized Circuits!
Consult your Local Building Department about Permits and Inspections for all Electric Wiring Projects.
The Safest Way to Test Electrical Devices and Identify Electric Wiring!The Non-Contact Electrical Tester
This is a testing tool that I have had in my personal electrical tool pouch for years, and is the first test tool I grab to help identify electrical wiring. It is a Non-contact tester, [amazon.com], I use for the detection of Standard Voltage in Cables, Cords, Circuit Breakers, Lighting Fixtures, Switches, Outlets and Wires. Simply insert the end of the tester into an outlet, lamp socket, or hold the end of the tester against the wire you wish to test. Very handy and easy to use.
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