IEEE P142/D4, Apr 2007

IEEE P142/D4, Apr 2007 is an unapproved draft recommended practice for grounding of industrial and commercial power systems, developed as a revision of IEEE Std 142-1991. It addresses grounding methods, system bonding, and related design considerations for power and energy applications where electrical safety, equipment protection, and reliable operation depend on a well-defined grounding approach. For engineers and specifiers, this draft provides technical guidance in a form that supports careful review during design and compliance planning.

IEEE P142/D4, Apr 2007 overview

This technical document focuses on grounding practices for industrial and commercial electrical systems, where grounding choices can affect fault clearing, noise control, and overall system performance. IEEE P142/D4, Apr 2007 is relevant to power distribution environments that require consistent grounding and bonding decisions across equipment and facilities. As a draft recommended practice, it is especially useful for understanding the intended direction of the revision and the engineering principles behind safe and dependable grounding design.

Typical use cases

IEEE P142/D4, Apr 2007 is typically consulted during the design or review of facility power systems, switchgear layouts, transformer connections, and grounding electrode arrangements. It may also be used when evaluating existing grounding installations in industrial plants, commercial buildings, and utility-connected power infrastructure. In practice, the document helps guide decisions involving equipment grounding conductors, bonding of conductive parts, and grounding coordination for systems where power quality and personnel safety are important.

Why this standard matters

Grounding is a core part of electrical system safety and reliability, and IEEE P142/D4, Apr 2007 helps formalize that design work with clearer technical direction. Using a grounded reference can reduce uncertainty in procurement, installation, inspection, and maintenance decisions. For projects in power, energy, and industry applications, the standard supports more consistent engineering practice, better fault management, and lower risk of unintended performance issues caused by poor grounding or bonding arrangements.

• Grounding of industrial and commercial power systems
• Revision guidance for IEEE Std 142-1991
• Bonding and fault-return considerations
• Design review for electrical safety and performance
• Useful for power distribution and facility systems