Bonding jumpers wrapper
Why you care (60 seconds)
Bonding jumpers keep metal parts at the same potential and ensure a low-impedance fault path. Missing or undersized jumpers are safety hazards.
Where people lose time
- Confusing bonding jumpers with equipment grounding conductors.
- Missing bonding at service raceways or enclosures.
- Using conductors too small for service bonding needs.
This is
The rule in plain language
Bonding jumpers connect metal parts to create a continuous fault path and must be sized based on the system or service conductors.
When it applies
Whenever service equipment, raceways, or enclosures must be bonded for fault clearing.
What you must do (checklist)
- Identify required bonding locations at services and equipment.
- Size bonding jumpers using the correct rules for the system.
- Ensure connections are secure and listed for the conductor type.
Quick examples
- Service raceways often need bonding jumpers.
- Bonding jumpers are sized differently than EGCs in some cases.
This is not
Common misreads
- Treating bonding jumpers as optional if equipment is metallic.
- Using EGC sizing tables for bonding jumpers without checking the rule.
What it doesn't cover
- Grounding electrode conductor sizing.
- Equipment grounding conductor sizing for branch circuits.
False friends
- A metal raceway is not bonded if fittings are not rated for bonding.
Exceptions & edge cases
- Parallel service conductors can affect bonding jumper sizing.
- Certain equipment listings may require specific bonding methods.
Cross-references (NEC map)
- Primary: 250.102
- Secondary: 250.92
Exam traps
- Choosing the wrong sizing method for bonding jumpers.
- Missing required bonding at service enclosures.
Field notes
- Verify bonding jumpers during service equipment inspection.
- Document bonding jumper sizes in service schedules.
AHJ / Local amendments notes (placeholder)
- Add local amendments or interpretations here.
Revision notes
- Draft wrapper created for bonding jumper fundamentals.