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What are the maximum circuits for Warmup non-jacketed cable?

Non-Jacketed Self-Regulating Cable

Based on available amperage or breaker rating, limit the total length of cable on the circuit based on the chart below. Your region’s “Minimum Start-up Temperature” will impact your maximum cable length.


(120V) 10A 15A 20A
32F/0C 107 127 133
14F/-10C 95 105 120
0F/-18C 73 93 113
-20F/-30C 60 80 107