Ungrounded Industrial Furnace Systems: NEC 250.21 Compliance and Expert Maintenance Services
Industrial electric furnaces in manufacturing and processing facilities often rely on specialized electrical systems to prevent costly downtime. Under NEC Section 250.21(A)(1), systems supplying industrial furnaces for melting, refining, or tempering processes are permitted to operate ungrounded. This allowance protects expensive equipment from damage caused by sudden power interruption on the first phase-to-ground fault. In […]










