An electrician had told him there were two safety-improvement options: 1) rewire some, or all, of the receptacles to have a true ground, a costly and messy undertaking; or 2) install receptacles with ...

First, install Ground Fault Circuit Interrupters (GFCIs) in areas that are most likely to expose someone to excess moisture (bathrooms, kitchens, garages, outdoor outlets, etc.). What is a GFCI ...

This case study involves the analysis of a phase-to-ground fault on one medium voltage motor that evolved into a phase-to-phase-to-ground fault involving a second motor. This fault scenario, commonly ...

Incomplete ground-fault sensing. Consider a 3-pole transfer switch with zero-sequence GFP at the service, as shown in Fig. 1. Suppose a fault occurs between one of the phase conductors and the ...

Motor 2: 5 hp, 230V, 3-phase: FLC = 15.20A [Table 430.250] Feeder protection [Sec. 430.62(A)] is to be sized no greater than the largest branch-circuit ground-fault and short-circuit overcurrent ...

New capabilities in low-voltage (LV) motor protective relays have enabled ground fault protection to be specially tuned for these process needs. This paper will examine several design alternatives for ...

If a motor shorts to ground it is called a ground fault. The pulser, installed on the power system, can then be energized putting a current pulse on the power feed. The technician in the plant would ...

The Fairchild chip uses a scheme which makes use of the definition of fault current resistance as spelled out in UL 943, the U.S. standard for ground-fault circuit interrupters. The standard specifies ...

Altech offers a wide variety of solutions to help prevent production shutdowns due to AC and DC pulsating ground faults, as well as overloads and short circuits. This article will look at its newest ...