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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
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. Determine the total current draw of the circuit and round up to determine the amp rating. Then chose the wire size that corresponds to the length and current rating for the circuit. 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
RATINGS CHART
Wire Type Stock No. Agency Rating Insulation Gauge Range Max Voltage Rating Page
Automotive Cross-Link Wire WX SAE J1128-SXL XLPE 18-8 60 10 Automotive Cross-Link Wire WL SAE J1128-GXL XLPE 20-8 60 10 Automotive Cross-Link Wire WM SAE J1128-TXL XLPE 22-8 60 10 Automotive Primary WG SAE J1128-GPT PVC 20-8 60 11 SGR Battery Cable SGR SAE J1128-SGR EPDM 6-4/0 60 12 SGT Battery Cable WB SAE J1127-SGT PVC 6-4/0 60 12 SGX Battery Cable WZ SAE J1127-SGX XLPE 6-2/0 60 12 Parallel Battery Cable WF SAE J1127 PVC OR TPE 8-2 60 13 Welding Cable WC Class K TPE/Neoprene 6-4/0 600 13 EPDM Welding Cable WCE SAE J1127 EPDM 6-4/0 600 13 Brake Cable WD SAE J1128-GPT PVC 18-8 60 14 CAN Bus Cable CB SAE J1939 Exrad 125 20-18 60 14 Multi-Conductor Shielded Cable ST UL Type CM/NEC Article 800 XLPE 22-18 300 15 Multi-Conductor Marine Cable MC UL 1426 PVC 16-10 600 15 Speaker Cable SC
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PVC 22-14 90 15 Service Cord SJ SJOOW CPE/EP 18-12 300 16 Service Cord SO SOOW CPE/EPDM 18-10 600 16 Hook Up Wire - UL Type WR UL 1015 / UL 1230 / UL 1032 PVC 22-10 600 17 Hook Up Wire - UL Type WN TFFN / THHN / THWN / UL 1408 / UL 1316 / UL 1452 PVC 18-10 1000 17 Trailer Cable WT SAE J1128 PVC 18-12 60 18 Parallel Bonded Cable WP SAE-GPT PVC 18-14 60 18
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