What gauge is used for high tension ignition wire?

• A. 14 gauge
• B. 12 gauge
• C. 16 gauge
• D. 18 gauge

Answer: (A)

Conductor size for ignition leads is chosen to minimize resistance and withstand heat in the ignition circuit. High-tension ignition wires carry high voltage to the spark source, and the lead must deliver that pulse reliably without excessive voltage drop or overheating in the tight, hot space around the burner. A thicker conductor, like 14 gauge, provides lower resistance per foot and better mechanical durability than thinner gauges, so the spark reaches the spark plug with sufficient energy and the insulation lasts under furnace conditions. Using a thinner gauge would heat more, wear faster, and be more prone to damage, while a much heavier gauge isn’t necessary for this application and can make routing harder. Therefore, 14 gauge is the standard choice for high-tension ignition wire.