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The things we are going to be talking about today can apply to all wiring situations, but for the purpose of today’s video, we will be focusing on how we wire a control panel.
Use the right kind of wire
MTW, THHN, XHHW
- MTW (www.rspsupply.com/c-1532-mtw-...) is most commonly found in control panels. It is more flexible which makes it ideal for maneuvering within the wire ducting or a control panel.
- THHN (www.rspsupply.com/c-1959-thhn...) is the most commonly used is homes and commercial building. It is more rigid, which makes it better for feeding through conduit, can be found as either stranded or solid wire.
- XHHW is a more rugged version of THHN. It has better insulating values and is commonly found being used in industrial applications due to its higher operating temperature and voltage ranges.
The right color for the right purpose
- Not all colors are created equal
- Important to look at local codes and customer requirements.
- NEC and UL standards are good points of reference when trying to select wire color. For example:
- According to UL standards: Green should always be used for ground. Black should always be used for AC Hot, and White for AC Neutral. There are several other requirements for signal wiring colors as well.
The right size for the application
- It is important that we know the voltages and potential current that can be running through our wire. Knowing these things, especially current, can help us determine what size of wire we need to use. A simple rule of thumb, the higher the current, the larger the wire we will need.
- Allow enough room for wire to bend - Don’t over bend
· Always try to give yourself a little extra space
- In the event that we need to make a change in the future it is always nice when we have extra wire in the panel that is available for any changes that may need to occur.
- When wiring in the field, it is a best practice to leave some wire coiled up in the bottom of the enclosure before we make the run and terminate.
Wire Terminations
Proper torque
- Not enough torque can lead to connection problems
- or can cause the wire to come lose over time of if it is disturbed in anyway.
- Too much torque, can damage the terminal block and the wire and should be avoided.
Don’t Birdcage and allow wires to fray at terminations points
- Describe and demonstrate bird caging
- Can lead to a short in the circuit
- How can we avoid bird caging?
Label, Label, Label: www.rspsupply.com/c-2874-wire...
- Labeling is very important when doing any kind or wiring.
- Proper labeling will allow others to easily identify the function of a wire, and where it is going.
- It can make troubleshooting later on much easier to anyone who might be working in the panel at a later date.
By following some of these simple steps, you’ll be able to get consistent, clean wiring in whatever application you might be working on.
Additional Links -
Website:
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Engineering Page:
rspsupply.com/engineering/
Panel Fabrication Page:
rspsupply.com/panel-fabrication/
Procurement Services Page:
rspsupply.com/procurement-ser...
Manufacturers Page:
rspsupply.com/manufacturers.aspx
Cable Wire & Assemblies:
rspsupply.com/c-620-cable-wir...
Enclosures:
rspsupply.com/c-1618-enclosur...
Terminal Blocks & Connectors:
rspsupply.com/c-1635-terminal...
Panel Hardware:
rspsupply.com/c-34-panel-hard...
Tools & Supplies:
rspsupply.com/c-7684-tools-su...
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