Industrial and commercial energy storage cabinet grounding standards

aCaution should be applied in using this form of grounding with industrial generation (see IEEE Std 367TM). Best suited for application in most medium-voltage industrial and commercial systems that are isolated from their electric utility system by transformers. Ideal for use on medium-voltage generators.

1.2.6 grounding system: A system that consists of all interconnected grounding connections in a specific power system and is defined by its isolation from adjacent grounding systems. The isolation is provided by transformer primary and secondary windings that are coupled only by magnetic means.

Generally used on systems of 2.4 kV to 15 kV particularly where large rotating machines are connected. aCaution should be applied in using this form of grounding with industrial generation (see IEEE Std 367TM). Best suited for application in most medium-voltage industrial

Purpose: As grounding systems technology advances, this recommended practice must be revised and updated to reflect these changes. The problems of system grounding, that is, connection to ground of neutral, of the corner of the delta, or of the midtap of one phase, are covered.

Special cases of system grounding are also addressed for generators, uninterruptible power supplies (UPS), portable mining equipment, and multi-voltage systems. Grounding of an electrical system is a decision that must be faced sometime by most engineers charged with planning or modifying electrical distribution.

This article explores the application of resistance grounding in hospitals, emergency power systems, and data process-ing facilities, where the distribution systems are complex and involve various sources, such as multiple transform- ers, generators, or a combination of both.