Electrical panel inspection: what to look for

When you inspect an electrical panel, you look at the service entrance, the panel's location and condition, the breakers or fuses, the conductors inside, and the grounding and bonding, and you report anything that looks unsafe, damaged or improperly installed. You are not testing the system's capacity, calculating loads or certifying it to code. Anything that suggests a hazard gets a clear recommendation for evaluation and repair by a licensed electrician.

This guide covers the exterior service, the panel itself and the most common findings, in roughly the order you will meet them on site. Check your state's rules and your standard of practice, such as the InterNACHI Standards of Practice, for exactly what you must and must not do at the panel.

Start outside: the service entrance

Before you open anything, look at how power reaches the house.

Overhead service

Service drop clearance over walkways, driveways, decks and roofs looks adequate, with no tree limbs in contact
Mast is straight, secure and not pulling away from the roof or wall
Weatherhead is intact, and the conductors form a drip loop below it
Service entrance cable sheathing is intact, not cracked or frayed, and is secured to the wall
Meter base is secure, sealed and not rusted through

Underground service

Conduit or cable at the meter is intact and protected where it leaves the ground
No erosion or settlement exposing the conductors
Meter base secure, with no gaps where water can enter

The utility usually owns the service drop and the meter. You can report a concern about them, and the recommendation is often to contact the utility rather than an electrician.

Panel location and working space

The location itself can be a finding.

The panel is readily accessible, not blocked by shelving, appliances or stored items
There is clear working space in front of it, as local codes require
It is not in a location where panels are commonly not allowed, such as a clothes closet or a bathroom
It is not exposed to water: watch for panels below plumbing, under a leaking window or on a damp basement wall
Exterior panels have intact covers and are rated for outdoor use

Codes set specific clearance and location rules and they change over time. You do not need to quote the code. Describe what you saw and recommend an electrician evaluate it.

Removing the dead front safely

Most standards of practice expect you to remove the panel cover when it is safe to do so. You also have the right to leave it on when it is not. Your safety comes first, and "the cover was not removed because..." is a legitimate limitation.

Before you touch it

Look for scorching, melting, rust, water staining or a hot smell
Check the floor: stand on a dry surface, never in water
Listen for buzzing or crackling
Check that the cover is not energized: some inspectors use a non-contact voltage tester on the cover first
Wear the personal protective equipment you have been trained to use, such as insulated gloves and safety glasses

Leave the cover on if

The panel is wet, heavily corroded or shows signs of arcing
The cover screws are painted over, stripped or the cover is stuck
The space in front of the panel is unsafe to stand in
The cover is wallpapered or built into finishes so that removing it would cause damage

While it is off

Stand to the side of the panel, not directly in front of it
Never insert tools, fingers or a probe into the panel
Note whether the original cover screws were blunt-tipped. Pointed sheet-metal screws can pierce conductors inside the panel, which is a common finding
Replace every screw before you leave, and confirm the cover sits flat

Most standards do not require you to operate breakers or the main disconnect, and many inspectors choose not to. If you do not, there is no need to explain at length; your standard covers it.

What to look for inside the panel

Work methodically: service conductors, main disconnect, bus and breakers, branch conductors, then neutrals and grounds.

Service size

Estimate the service size from the main breaker or fuse rating and the size of the service entrance conductors. Report it as an estimate. If the main breaker rating seems higher than the conductors appear to support, recommend an electrician evaluate it. You are not doing a load calculation.

Breakers and fuses

Breakers that look scorched, melted, cracked or loose on the bus
Breakers that do not appear to be the type the panel is listed for (mixing brands is a common finding)
Double-tapped breakers: two conductors under a single terminal that is not designed for two
Breaker size that appears too large for the wire it protects
Missing knockouts or open breaker slots that leave live parts exposed
In fuse panels, fuses that appear oversized for the circuit and adapters that look tampered with or missing

Branch circuit conductors

Signs of overheating: discolored insulation, melted sheathing, browned terminals
Aluminum branch circuit wiring, especially solid conductors on 15 and 20 amp circuits
Conductors without proper clamps or bushings where they enter the panel
Sheathing stripped back too far, or not entering the panel at all
Taps and splices inside the panel where they do not belong

On aluminum branch wiring, the Consumer Product Safety Commission's guide Repairing Aluminum Wiring explains why connections are the concern and which repairs it recommends. You do not need to explain the chemistry in your report. Name what you saw and recommend a licensed electrician who is familiar with aluminum wiring evaluate the system.

Neutrals, grounds and bonding

Main panel: a grounding electrode conductor is visible and connected, with the main bonding jumper or screw in place where it should be
Subpanels: neutrals and equipment grounds appear to be on separate bars, with the neutral bar not bonded to the enclosure
Multiple neutral conductors under a single terminal screw
Grounding electrode connection at the rod or water pipe, where visible

Bonding questions are easy to get wrong. If something looks off, describe it ("neutral and ground conductors share the same bar in this subpanel") and recommend an electrician evaluate it, rather than stating that the panel is "not grounded."

Labeling and protection devices

Circuit directory missing, incomplete or illegible
Presence of arc-fault (AFCI) and ground-fault (GFCI) breakers, and whether test buttons respond if you choose to test them

Requirements for AFCI and GFCI protection depend on when the home was built and local codes. In an older home, the absence of either is usually a recommendation to consider an upgrade for safety, not a defect.

Panels and conditions that call for an electrician

Observation	Why it matters	Typical recommendation
Scorching, melting or burnt smell	Possible overheating or arcing	Licensed electrician evaluate promptly
Double-tapped breaker	Loose connection, overheating	Electrician evaluate and correct
Breaker apparently oversized for wire	Wire may not be protected from overload	Electrician evaluate
Open slots or missing knockouts	Exposed live parts	Electrician install proper fillers
Water staining or rust in the panel	Corrosion, failure of components	Electrician evaluate, identify water source
Aluminum branch wiring	Connection concerns described by CPSC	Electrician familiar with aluminum wiring evaluate
Panel brands with known concerns	Reports of breakers that may not trip as expected	Electrician evaluate

Certain older panels, including Federal Pacific Electric panels with Stab-Lok breakers and some Zinsco panels, are widely flagged in the inspection industry for further evaluation. Keep the wording factual: identify the panel, state that this type is commonly recommended for evaluation, and refer it to an electrician. Do not tell the client it will fail or that it must be replaced.

How to word electrical panel findings

Use the observation, implication and recommendation pattern, and choose the severity honestly. Severity levels covers how to decide.

Double tap

Two conductors are connected to a single breaker terminal at the 20 amp breaker in the third position on the left. This breaker does not appear to be designed for two conductors. This can cause a loose connection and overheating. Recommend a licensed electrician evaluate and correct.

Signs of overheating

Discolored insulation and a scorched terminal were observed at a breaker in the main panel. These are signs of overheating, which is a potential fire hazard. Recommend a licensed electrician evaluate and repair promptly.

Limitation

The panel cover was not removed because the cover screws were painted over and could not be removed without damage. The interior of the panel was not inspected. Recommend a licensed electrician inspect the panel interior.

Photos and documentation

Wide shot of the panel and its surroundings, including anything blocking access
Panel label, if legible, with the manufacturer and model
Interior photo with the cover off, plus close-ups of each defect
The service entrance and meter from outside

A clear photo helps the electrician who follows you and protects you if the client later disputes what was there. Documenting conditions on inspection day goes further on that point.

Keep it consistent across inspections

Electrical findings repeat. Saving tested wording for double taps, open slots, aluminum wiring and missing labels means every client gets the same clear explanation. iSpector inspection reports let you build a template with your own sections, items and severity levels, and save reusable comments to a comment library you can drop in from the field.

Key takeaways

Inspect the service entrance before the panel, and refer utility-owned parts to the utility.
Remove the dead front only when it is safe, and report it as a limitation when it is not.
Look for overheating, double taps, apparent oversizing, open slots, aluminum branch wiring and bonding problems.
Describe what you saw instead of diagnosing, and refer electrical hazards to a licensed electrician.
Photograph the panel inside and out so the electrician and the client see what you saw.

Inspecting the electrical panel: what to look for