Find the right electrical wire size based on load current, distance, and voltage drop requirements. Supports both NEC (USA) and CEC (Canada) with appropriate derating factors for temperature and conduit fill conditions. Calculate proper wire gauge, voltage drop, and ampacity for safe electrical installations. Why Use Our Wire Size Calculator? Calculations follow National Electrical Code standards for safe. NEC Article 314 establishes requirements for the installation and use of electrical boxes, conduit bodies, fittings, and handhole enclosures. A conduit body is a removable-cover section of a conduit system that provides access at junctions or termination points. Undersized cables can lead to: Energy inefficiency: Higher I²R losses increasing operational costs.