Grounding vs bonding may sound like a small terminology issue, but they serve two different purposes. Grounding connects an electrical system to the earth, while bonding connects metal components together to maintain the same electrical potential. Confusing the two can create electrical systems that pass visual inspection but fail under fault conditions.
Electrical malfunctions contribute to tens of thousands of residential fires in the United States each year, according to the National Fire Protection Association (NFPA). Understanding the difference between bonding vs. grounding is critical to electrical safety.
Erie Institute of Technology’s Electrician Training Program teaches grounding and bonding as core safety concepts through hands-on lab training. Here’s what to know about grounding, bonding, and the key differences between the two.
What Is Grounding in Electrical Systems?
Grounding is the process of connecting an electrical system to the earth. Its main purpose is to improve safety by helping control excess electricity and keeping voltage levels stable during faults, power surges, or lightning strikes.
The NFPA 70 National Electric Code (NEC) recognizes two primary types of grounding: system grounding and equipment grounding.
| Type of Grounding | Purpose |
|---|---|
| System Grounding | Connects the electrical system to the earth to help stabilize voltage |
| Equipment Grounding | Connects metal equipment and enclosures to the grounding system for safety |
The Equipment Grounding Conductor (EGC)
The Grounding Electrode System
What Is Bonding in Electrical Systems?
For example, if a metal electrical panel and a metal gas pipe are located in the same area, they may be bonded together. If a fault occurs, bonding helps ensure that the metal components maintain the same electrical potential.
Main Bonding Jumper and System Bonding Jumper
A bonding jumper connects grounding and bonding components within an electrical system. Electricians install the main bonding jumper at the service equipment and use a system bonding jumper in certain separately derived systems. To prevent unsafe current paths, the NEC outlines approved bonding points for neutral and ground to connections.
Types of Bonding Conductors and Connections
Key Differences Between Grounding and Bonding
| Attribute | Grounding | Bonding |
|---|---|---|
| Purpose | Connects the electrical system to earth and helps provide a path for fault current | Connects metal parts together and equalizes the voltage potential |
| What Is Connected | Electrical system and grounding electrodes | Metal enclosures, conduit, piping, and structural metal |
| If Missing | Increased risk of unstable voltage and electrical faults | Increased risk of voltage differences between metal components |
| Key Components | Ground rod, grounding electrode conductor, EGC | Bonding jumper, bonding conductor, bonding bushing |
Where They Overlap — and Why That Confuses People
How the NEC Defines Each Term
| Term | NEC Definition |
|---|---|
| Grounded (Grounding) | Connected to ground or to a conductive body that extends the ground connection. |
| Bonded (Bonding) | Connected to establish electrical continuity and conductivity. |
Why Both Grounding and Bonding Are Required by Code
The NEC requires grounding and bonding because they work together to reduce electrical hazards and operate devices. Electrical work in Pennsylvania must comply with the NEC as adopted by the Pennsylvania Uniform Construction Code.
Improper grounding or bonding from DIY electric work can lead to:
- Increased risk of electric shock from energized metal components
- Breakers or fuses failing to respond properly during faults
- Damage to electrical equipment from voltage irregularities
- Arcing, overheating, or other code compliance and safety issues
- Failed electrical inspections due to code violations
5 Common Mistakes and Misconceptions About Electrical Grounding and Bonding
1. Using grounding and bonding interchangeably
2. Confusing a bonding bushing with a grounding bushing
3. Connecting neutral and ground in a subpanel
4. Assuming conduit always provides adequate bonding
5. Overlooking grounding and bonding during troubleshooting
Learn Electrical Grounding and Bonding Basics at EIT
Understanding grounding vs bonding is a foundational skill across many technical careers. Erie Institute of Technology incorporates these concepts into our hands-on training programs.
Industrial Maintenance & Mechatronics (9-month training program)
EIT’s 9-month Industrial Maintenance & Mechatronics program combines electrical, mechanical, automation, and manufacturing concepts. Students learn skills related to motor controls, PLCs, and industrial systems where grounding and bonding play an important role.
Electronics Training Programs (12- and 18-month training program options)
EIT offers a 12-month Electronics Technician program and an 18-month Medical Equipment Technician program. Students learn to install, troubleshoot, repair, and maintain electronic systems while building a strong understanding of electrical safety fundamentals.
Electrician Training Program (15-month training program)
EIT’s 15-month Electrician Training Program provides the most in-depth electrical training, covering residential, commercial, and industrial electrical systems. Students explore grounding and bonding principles and their applications in real-world electrical installations.
Start Your Career at Erie Institute of Technology
Apply to EIT today and see how far our hands-on technical training can take you.
Grounding vs. Bonding Frequently Asked Questions (FAQs)
What is the main difference between grounding and bonding?
Both improve electrical safety, but they serve different purposes. Grounding connects an electrical system to the earth, while bonding connects metal parts to each other.
Can you bond without grounding?
Yes. Bonding and grounding are separate functions, but most electrical installations require both for safety and code compliance.
Is the neutral wire the same as a ground wire?
No. The neutral carries current during normal operation, while the equipment grounding conductor primarily serves as a safety path during electrical faults.
What is a bonding jumper used for?
A bonding jumper connects grounding and bonding components within an electrical system. It helps create the required electrical continuity between approved components.
What is the difference between a bonding bushing vs grounding bushing?
A bonding bushing helps maintain a bonding connection, while a grounding (insulating) bushing protects wire insulation. They serve different purposes and are not interchangeable.
About the Author
Ross Aresco
CFO
Ross Aresco is the CFO of Erie Institute of Technology. Erie Institute of Technology (EIT) is an Erie Pennsylvania technical/trade school providing training programs for medical, computer, electronics, manufacturing, and technology careers. EIT offers programs in many different areas to suit your interests and talents.