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Most residential homes and some small businesses use what’s called single-phase wiring, while larger businesses, which need greater electrical capacity, use three-phase wiring.
Unlike most homes and apartments where electrical wires are embedded inside the walls, commercial electrical wire is often exposed and runs along the surface of the wall using metal or plastic conduit.
Your electrical system is governed by the National Electrical Code (NEC), which defines how commercial establishments should be wired for electricity.
Commercial wiring often has a higher level of insulation, known as TTHT (Thermoplastic, high-heat resistant, nylon coated). This helps to protect the electrical wiring from corrosive gases and liquids. In some cases, special outlets may be installed for power-hungry or especially sensitive equipment.
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