Determining 100V Wire Sizes & Run Lengths

Are you confused about what cable size to use in 100V PA installations?

Use the handy table below to get an approximate idea of the minimum cable size you need to use—simply find the Distance you need to run in the column that best matches the Power of your system. This is the minimum cable size you need to run for your system.

Alternatively, if you already have cable and want to know the maximum run and power it can handle start with the Cable size and read across to Power and Distance values.

Cable Size		Ω / 100m	Maximum cable length against System Power
Wire section	AWG	Ω / 100m	125W	250W	500W	1000W
13.3mm²	6	25Ω	4,367m	2,180m	1,086m	539m
6.6mm²	8	49Ω	2,177m	1,087m	541m	269m
5.3mm²	10	62Ω	1,727m	862m	429m	213m
3.3mm²	12	99Ω	1,087m	542m	270m	134m
2.1mm²	14	157Ω	683m	341m	170m	84m
1.3mm²	16	249Ω	430m	215m	107m	53m
0.8mm²	18	398Ω	269m	134m	67m	33m
0.5mm²	20	628Ω	171m	85m	42m	21m
0.3mm²	22	989Ω	108m	54m	27m	13m
Resulting line impedance			80Ω	40Ω	20Ω	10Ω

Results are for a signal loss of 1dB. For 3dB loss, muiltiply the maximum lengths by 3.5

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