1/0 vs 2/0 Welding Cable: Which One Should You Buy?

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Below: the direct answer in full, what the 1/0 listings state about construction, voltage and temperature, the gear covered in this guide, and how to choose between the gauges without guessing at a figure the listing does not state.

1/0 vs 2/0 welding cable: the direct answer

The labels 1/0 and 2/0 name different gauges, and the gauge label alone does not tell you the voltage rating, the temperature range, the strand count, the insulation or the length. Those details come from the listing for the cable in front of you, and they differ from listing to listing even within the same gauge. That is why this guide works from stated figures only: a cable that fits one job may not fit another job simply because the gauge label matches.

For a garage job, the practical check is a short one. Read the gauge on the listing, read the length, read whether terminals are already fitted and what size they take, and read the voltage and temperature ratings the listing states. If any of those figures is missing from a listing, treat it as not stated for that cable, not as a figure you can borrow from a different cable.

What the 1/0 listings state

All four cables in this guide are 1/0 AWG cables with pure copper conductors, and all four listings describe a fine-strand build: 1703 strands of 0.2mm copper wire. The insulation is EPDM rubber in each listing, and the temperature range stated across the listings is -58°F to 221°F, also given as -50°C to 105°C. Voltage ratings differ by listing, so they are shown per cable in the table, not as a single rating for the gauge.

The table shows why a gauge label is not a full specification. Two cables can share the 1/0 label and still state different voltage ratings, different lengths and different terminal arrangements. The same applies in the other direction: a 2/0 listing must be read on its own figures, not assumed to match any figure in this table.

The gear in this guide

Shirbly 1/0 Gauge Battery Cable, 20FT pair. This pair is a red cable and a black cable, each 20FT long, made from pure copper wire with an EPDM rubber insulation sheath. The listing states a rating of up to 600 volts, a temperature range from -58°F to 221°F, and resistance to most solvents, with a fire resistant polyolefin material noted in the listing. It is described for automotive, battery, solar and generator use, and for DC applications where pure copper is recommended. No terminals are stated for this pair.

WotyWire 1/0 Gauge Wire, 20FT pair. This pair is also a red cable and a black cable, each 20FT long, built from oxygen-free annealed copper with 1703 strands of 0.2mm wire. The listing states 2.2mm EPDM insulation with an additional PET film layer, a rating of 450/750V, and operation from -50°C to 105°C, given as -58°F to 221°F. It is described for welding, battery use, inverters and energy storage, and for solar, automotive, RV, marine and industrial power setups. No terminals are stated for this pair.

Shirbly 1/0 AWG Flexible Battery Cable with 3/8 inch terminals, 2FT pair. This is the short, ready-ended option in the guide: a red cable and a black cable, each 2FT long, with 3/8 inch round center hole terminals already crimped on both ends and 3:1 dual wall adhesive heat shrink tubing. The listing states pure copper cable lugs with a tin coating for corrosion protection, a closed end design to protect the cable from moisture, acid and solvents, a rating of up to 600 volts, and a temperature range from -58°F to 221°F. The short length suits a close battery or inverter connection where a long run is not needed.

WotyWire 1/0 Gauge Wire Battery Cable with lugs, 10FT pair. This kit pairs a 10FT red cable and a 10FT black cable with 10 tinned copper lugs, 5 at 3/8 inch and 5 at 5/16 inch, plus 2 pieces of 20cm glue-lined heat shrink tubing for insulation and moisture protection. The listing states 1703 strands of 0.2mm annealed oxygen-free copper, a 53.49mm² cross-section, 2.2mm thick insulation, a rating of AC 450V and DC 750V, and operation from -50°C to 105°C, given as -58°F to 221°F. It is described for heavy-duty welding, battery cables, inverters and energy storage, and it is RoHS certified in the listing.

How to choose between the gauges

Start with the job, not the label. Measure the run the cable must cover, check the stud size the terminals must fit, and check the voltage and temperature ratings the listing states for the exact cable you are considering. A cable that is too short for the run, or fitted with terminals that do not match the stud, is the wrong cable for that job whatever the gauge label says.

Then read the 2/0 listing the same way, figure by figure. Do not carry a voltage rating, a temperature range, a strand count or a length across from a 1/0 listing to a 2/0 listing. If the 2/0 listing does not state a figure you need, that figure is not stated for that cable, and check the manual for the equipment it will feed.

FAQ: garage tools

What is welding cable made of?

On the evidence of these listings, welding cable here is made from pure copper conductors with EPDM rubber insulation. All four listings describe 1703 strands of 0.2mm copper wire, and the WotyWire listings add a PET film layer. Lugs, where stated, are tinned copper.

How are welding cables rated?

In these listings, cables are rated by voltage and by temperature range, and the figures differ by listing. Shirbly listings state up to 600 volts, WotyWire listings state 450/750V or AC 450V and DC 750V, and all four listings state operation from -58°F to 221°F, also given as -50°C to 105°C. Read the rating on the exact listing, not on the gauge label alone.

What gauge welding cable do I need?

These listings do not state a gauge selection rule, so this guide does not give one. Choose from the gauge, length, terminals, voltage rating and temperature rating stated on the listing for the cable you plan to buy, and check the manual for the equipment it will feed. If a figure you need is not stated, treat it as not stated rather than guessing.

How much does welding cable weigh per foot?

No weight per foot is stated in these listings, so this guide does not state one. Lengths stated here are 20FT, 10FT and 2FT pairs, but length alone does not give weight, and no weight figure is stated to work from.

How much is welding cable per foot?

No price is stated in these listings, and this guide does not list prices. Check the listing for the cable, length and terminal arrangement you need.

Related: our engine and shop equipment hub for more garage gear guides.