H-Rated Grounding

The building of higher-powered substation and transmission systems has led to a continuous increase in the power capability of the national electric grid and the need for higher rated grounding components and accessories. The ASTM F855 standard, which outlines the specifications for temporary protective grounding, contains updates to reflect these changing requirements. Honeywell Salisbury™ is committed to helping its customers strive for the highest level of worker safety and offers a broad selection of grounding components that are compliant with the latest standard.

The increase in power capability has resulted in the potential for higher fault currents and asymmetry factors, referred to as X/R ratios. Table 2 within the ASTM F855 standard outlines the test requirements for grounding assemblies to be used with the higher X/R ratios that may be encountered in the field. Grounding components which have been tested to the requirements in Table 2 are identified with an H rating. The grounding components listed are rated for asymmetrical fault currents of 47kA (5H components) or 68kA (7H components) for 15 cycles. Salisbury can assist with designing custom ground assemblies to meet customer field requirements. Contact your sales representative for assistance.

Proper personal protective grounding has saved many lives. Rely on Honeywell Salisbury™ to provide options for protective equipment that is designed to meet high X/R ratio grounding applications.