Electrical Safety Resources

Littelfuse is Committed to Safety

Littelfuse has a continuing commitment to improve electrical safety and system protection. As the leader in circuit protection, Littelfuse offers a variety of products and services designed to help you increase safety in your facility.

Littelfuse offers a variety of resources to help you with solutions to keep everyone safe. Electrical Safety in the workplace is the most important job of an electrical worker. No matter how much training one has received or how much employers try to safeguard their workers, Electrical Safety is ultimately the responsibility of the electrical worker. The human factor associated with electrical accidents can be immeasurable. No one can replace a worker or loved one that has died or suffered the irreparable consequences of an electrical accident.

USING CURRENT-LIMITING FUSES TO INCREASE SCCR

The Short Circuit Current Rating is the maximum current the control panel can safely withstand without excessive damage. If the available fault current of the electrical system where the panel is installed exceeds the SCCR of the panel and a short circuit occurs, catastrophic damage to the panel may occur and electrical workers and others are put at risk of injury.

Current-limiting fuses operating in their current-limiting range will limit the maximum instantaneous peak current to a value substantially less than the peak current that could flow if the fuse were not in the circuit. This white paper explains in more detail how that is accomplished.

ELECTRICAL SAFETY HAZARDS HANDBOOK

The purpose of this handbook is to identify electrical safety hazards and present ways to minimize or avoid their consequences. It is a guide for improving electrical safety and contains information about governmental regulations, industry-accepted standards and work practices. It presents ways to meet the standards and reduce the hazards.

WHY NEUTRAL-GROUNDING RESISTORS NEED CONTINUOUS MONITORING

This paper reviews the benefits of resistance grounding, compares continuous resistor monitoring with planned maintenance testing and inspection, and defines the characteristics required of a neutral-grounding-resistor monitor. Case studies are presented that show the need for continuous monitoring of the neutral-grounding resistor.

IMPROVE SAFETY WITH INSTANT ARC-FLASH DETECTION

The Littelfuse PGR-8800 Arc-Flash relay reliably detects developing Arc-Flash incidents by looking for a combination of excess light and current. The PGR-8800 detects both conditions and offers programmable definite-time overcurrent protection and adjustable light trip-level to minimize nuisance tripping.

PGR-8800 ARC-FLASH RELAY TECHNICAL FAQ

Power system analysis software programs can be used to help with system coordination. The arc flash relay has two definite-time settings (10-1000% full-load current and 1ms – 20s time delay) that can be used for coordination, however, both control one set of output trip contact. One setpoint can be used for detecting a low-level arcing condition and the other can be used for detecting high-level arcing condition. If either condition is met, a trip signal is sent to the circuit breaker.