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Total Approx. Circuit Amperes

Wire Gauge (For Length In Feet)

12VDC

3 5 7 10 15 20 25 30 40 50 75 100

1 18 1.5 18 2 18 16 3 18 14 4 18 16 12 5 18 16 14 12 6 18 16 14 12 10 7 18 16 14 10 8 18 16 14 12 10 18 16 14 12 10 11 18 16 14 12 10 8 12 18 16 14 12 10 8 15 18 14 12 10 8 18 16 14 12 10 8 20 16 14 12 10 8 6 22 14 16 14 12 10 8 6 24 14 12 10 8 6 30 12 10 6 4 40 10 8 6 4 2 50 8 6 2 100 4 2 1 1/0 150 2 1 2/0 200 1/0 4/0

WIRE & CABLE GUIDE

Wire Type Agency Rating Insulation Gauge Range Max Voltage Rating Page

WX SAE J1128-SXL XLPE 18-8 60 10 WL SAE J1128-GXL XLPE 20-8 60 10 WM SAE J1128-TXL XLPE 22-8 60 10 WG SAE J1128-GPT PVC 20-8 60 11 SGR SAE J1128-SGR EPDM 6-4/0 60 12 WB SAE J1127-SGT PVC 6-4/0 60 12 WZ SAW J1127-SGX XLPE 6-3/0 60 12 WF SAE J1127 PVC OR TPE 8-2 60 13 WC Class K TPE/Neoprene 6-4/0 600 13 WCE SAE J1127 EPDM 6-4/0 600 13 WT SAE J1128 PVC 18-12 60 14 WP SAE-GPT PVC 18-14 60 14 WD SAE J1128-GPT PVC 18-8 60 15 CB SAE J1939 Exrad 125 20-18 60 15 ST UL Type CM/NEC Article 800 XLPE 22-18 300 16 MC UL 1426 PVC 16-10 600 16 SC

*

PVC 22-14 90 16 SJ SJOOW CPE/EP 18-12 300 17 SO SOOW CPE/EPDM 18-10 600 17 WRT UL 1015 / UL 1230 / UL 1032 PVC 22-14 600 18 WR UL 1015 / UL 1230 / UL 1032 PVC 22-10 600 18 WQT WL 1007 / WL 1569 PVC 24-18 300 18 WN TFFN / THHN / THWN / UL 1408 / UL 1316 / UL 1452 PVC 18-10 1000 18

* Not rated

USING THE CHART

1. Measure the length of wire in the circuit including the ground return. A two-wire circuit will be the total lengths of both the wires. Account for both vehicles on auto and trailer applications. 2. Find the total amperes, watts, or candlepower and choose the nearest number in Circuit Amperes column. 3. Look across for proper footage to find nearest wire gauge.

Note:

18-gauge applications inside of the shaded area could be 20-gauge for electrical purposes. However, it is recommended to use 18-gauge for the tensile strength of the wire. Chart is based on maximum 10% voltage drop @ 100 F (in free air).

WIRE SIZING CHART

Source: East Penn Wire Guide Chart