![]() ![]() Please ensure you cross reference and refer to manufacturers specifications. ![]() The above calculator is provided as a guide. inside conduit or thick bundle) Calculate. We’d like to thank Blue Sea Systems with their help in compiling this informative information. Toggle if cable will not be in free air (e.g. The Circuit Wizard is easy to use, and is accessible from any computer with an Internet connection or available for download via the iOS App Store or Android apps for mobile devices. It allows you to input detailed information including cable insulation temperature rating and other de-rating factors. This is a calculator for the estimation of the voltage drop of an electrical circuit based on the wire size, distance, and anticipated load current. The Circuit Wizard, at, is a resource for a more detailed treatment of cable size selection for DC circuits. The load-wiring-calculator will give you a very simple and quick solution to the problem of calculating the size of wires and DC maximum load for LED power transmission. Circuit length is 50’, circuit type is ‘non-critical’, and correct cable size is 4 AWG. Non-critical DC circuits, with 10% allowable voltage drop, includeįollow down the column until you find your circuit’s LENGTH IN METERSĭ Intersect CURRENT IN AMPS with LENGTH IN METERS to identify the cable size.Įxample: A winch rated at 80A is 25’ from the battery. Allowable voltage drop is based on whether a circuit is critical or non-critical.Ĭritical DC circuits, with 3% allowable voltage drop, include Note that the total length of the circuit is the round-trip distance from power source (usually the battery) to the product and back.Ĭ Select the CIRCUIT TYPE. Most electrical products include a rating label, or you can find the amperage rating in the documentation that came with the product.ī Find circuit LENGTH IN FEET along the left side of the chart. To use the chart included with this technical brief, follow the instructions below.Ī Locate the CURRENT IN AMPS of your appliance across the top of the chart. A lower rating will decrease the current-carrying capacity of the wire. In addition, the DC Cable Selection Chart shown below assumes a cable insulation rating of 105☌. Quality marine wire, as specified by ABYC standards, will always be stranded rather than solid, and always tin-plated copper. This technical brief distills the information on these charts to a more manageable size for installers and caravan/boatowners alike. Although these charts are an excellent resource, they are a bit intimidating. The American Boat and Yacht Council (ABYC) publishes charts with valuable detail to help experienced electrical installers determine what wire size they need. Choosing the right cable size for your DC electrical project is important, since a wire that is too small can overheat and possibly start a fire. ![]()
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