Grounding and bonding are related electrical-safety concepts, but they are not the same thing. Grounding connects an electrical system or equipment to earth or another grounding reference. Bonding electrically connects conductive parts so they remain at substantially the same potential and provide electrical continuity.

This lesson follows OSETC.011: Lockout/Tagout and Energy Isolation. It is a recognition-and-theory lesson; it does not authorize work on energized equipment.

Grounding in Plain English

Think of grounding as establishing an intentional connection to ground. In properly designed systems, grounding is part of the protection scheme and helps control dangerous voltage conditions.

Bonding in Plain English

Bonding joins conductive metal parts together electrically. For example, metal enclosures, raceways, and other conductive parts may need effective bonding so electrical continuity is maintained and fault current can be carried safely.

Video: Grounding and Bonding

This visual walkthrough demonstrates a simple grounding and bonding system and shows current flow during normal operation and a ground-fault condition.

Why Technicians Care

OSHA requires grounding paths used by circuits, equipment, and enclosures to be permanent and continuous, and bonding conductors used for electrical continuity must be capable of carrying imposed fault current. For a technician, damaged or missing grounding and bonding connections are safety concerns that should be reported and handled according to site procedures.

A Simple Fault Example

Imagine an internal fault causes an energized conductor to contact a metal equipment enclosure. Proper equipment grounding and bonding provide an intentional conductive path as part of the system’s fault-clearing design. The protective device can then operate as designed rather than leaving exposed metal in a dangerous condition.

Data Center Example

Data centers contain racks, cabinets, cable trays, electrical enclosures, and other conductive structures. A technician should recognize grounding and bonding conductors and connections, avoid disconnecting them casually, and escalate visible damage, looseness, corrosion, or missing connections through the site’s electrical-safety process.

Ground Is Not the Same as Neutral

A grounded conductor such as a neutral and an equipment grounding conductor have different functions. Do not treat them as interchangeable simply because both may ultimately be connected within the grounding system at specific permitted locations.

Safety Boundary

Do not open energized electrical equipment, alter grounding or bonding connections, or install temporary protective grounds unless you are qualified, authorized, and following the applicable electrical-safety and lockout/tagout procedures.

Practice

1. In a training diagram, identify the grounding connection.
2. Identify two conductive parts that are bonded together.
3. Explain grounding in one sentence.
4. Explain bonding in one sentence.
5. Explain why a damaged grounding or bonding connection should be treated as a safety issue.

Key Takeaway

Grounding establishes a connection to ground; bonding electrically joins conductive parts. Both are important parts of electrical safety, and technicians should be able to recognize their purpose without modifying them outside their training and authorization.

Reference: OSHA 1926.404 — Wiring Design and Protection.