The current load determines the gauge wire for led tape light power supply which connect to LED light. A problem that there is a long distance between where the light is to be connected to the led light bulb power supply, at this time, we should consider installing an extension cord between them. Paying attention to the gauge specification of the extension cord is essential when installing the extension cord,

A simple rule that can determine the cable cross section for wires: 0.1 mm² is required for per ampere current. For instance,  the measurement result is 0.5mm² for 5A current.Typically, the next higher standard, 0.75 mm² wires will be selected to connect the components. In the applications of RGB strip light, the current of the common positive wire is 3 times the current of each color wire.

For example, the max current is 1A for each color wire , the sum is 3A for one RGB light, so the cable cross section for positive wire is at least 0.3 mm², each color wire should be 0.15 mm².

If there is a long transmission distance between the low voltage lighting power supply and the lights, you should select larger cross section wires to minimize the loss along the line. However it is more difficult to soldering with large cross-section wires.

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