As the wire size amp rating chart at cerrowire states under normal household temperature conditions the maximum current rating for a 14 gauge wire is 15 amps while that for a 12 gauge wire is 20 amps.
What size wire do i need for led lights.
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That means first you determine what size wire you need based on the length of the wire run to the 150 watt lights.
It s ok to wire a 15 amp light circuit with a 14 gauge wire to save a bit of money and make the wiring job a bit easier.
Once your landscape lighting design is complete you can figure out what size of low voltage transformer you need.
Wire gauge or size can be found printed on electric cables.
Use a tape measure to measure the length of the wire you intend to use.
You need to match wire size with rated ampacity to ensure safety and efficiency.
The 14 gauge wire or 14 2 and 14 3 type nm is most commonly used for home lighting circuits because most switches for homes are rated for 15 amps therefore using a larger size would not be compatible with these devices and it would not be as easy to make the connections when using a larger wire size.
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More factors that influence wire size.
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Other factors that affect wire size are the length and wire type.
The first number is the wire gauge.
The cost difference between it and smaller cable is essentially negligible and 18 gauge is about as big as you can go if you still want to be able to fit it into most cob holders or terminals.
You will normally see number series labels such as 12 3 and 14 2.
If there is some pre installed factory wire and you have changed the lights.
You need to do this from the last led you are wiring to the power supply.
12 volt led light strips.
If the distance is 20 feet you need 40 feet of wire.
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