Grounding and bonding explained simply
When a hot wire touches a metal appliance case, the equipment ground carries that fault current back to the panel so the breaker trips — instead of the case staying energized. Without a ground, that metal could shock the next person to touch it.
Bonding connects metal water pipes, gas piping and other systems to the grounding system. Plumbing replacements with plastic pipe can break an old bond path unintentionally, which is why grounding is worth re-checking after renovations.
What the work typically involves
Inspect the electrode system
Check ground rods, clamps and the grounding electrode conductor.
Verify bonding
Confirm water and gas piping bonds and continuity.
Test outlets
Test for missing grounds, open grounds and reversed polarity.
Correct deficiencies
Repair connections, add bonds and address ungrounded circuits.
Common reasons homeowners call
- Ungrounded outlets throughout older homes
- Plumbing replaced with plastic pipe
- Installing surge protection
- Electronics damaged frequently
- Inspection flagged grounding
Signs of a grounding problem
- Mild shocks from appliances or fixtures
- Three-prong outlets that test as ungrounded
- Loose or corroded ground clamp
- Missing ground wire at the meter or panel
- Frequent electronics failures
Safety considerations
Shocks are a warning. A shock from an appliance, faucet or fixture can indicate a grounding or wiring fault. Stop using it and call. Never remove the ground pin from a plug.
What an electrician will check
- Ground rods and clamp condition
- Grounding electrode conductor
- Water and gas bonding
- Outlet grounding and polarity
- Neutral-ground separation in subpanels
Related electrical problems
Related residential services
Surge Protection
Whole-house surge protectors at the panel plus point-of-use protection for electronics and appliances.
Electrical Inspection
Whole-home electrical safety inspections for older homes, home purchases, renovations and insurance questions.
Home Rewiring
Replacing outdated, damaged or unsafe wiring throughout a home — knob-and-tube, ungrounded or deteriorated cable.
Electrical Outlet Installation
Adding outlets where you need them — including USB, 240-volt, outdoor, countertop and dedicated appliance outlets.
Frequently asked questions
They lack an equipment ground, which matters for three-prong devices. Options include running a ground, rewiring or adding GFCI protection with proper labeling.
Grounding connects the system to the earth and provides a fault path; bonding connects metal parts together so they stay at the same potential.
A loose neutral is a more common cause of flickering, but grounding and neutral issues can overlap. Both should be checked.