You've hit on a topic with a lot of debate and valid concerns. Here's a breakdown of the issues surrounding used breakers, especially GFCI and AFCI breakers in obsolete panels

Concerns About Used Breakers (General):
Unknown History

You don't know the breaker's history. Has it been overloaded repeatedly? Has it been subjected to harsh conditions? This can significantly reduce its reliability.

Potential Internal Damage

Breakers can suffer internal damage from faults or overloads that isn't visible externally. This damage can prevent them from tripping properly when needed.

Corrosion

Corrosion can affect the breaker's mechanism, leading to slow or failed tripping.

Counterfeits

There's a risk of purchasing counterfeit breakers that don't meet safety standards. This risk is arguably lower with older, obsolete breakers, but it still exists.

Misrepresentation

Sellers may not accurately represent the breaker's condition or functionality.

Specific Concerns About Used GFCI and AFCI Breakers



Complex Electronics

GFCI and AFCI breakers rely on sensitive electronics to detect ground faults and arc faults. These components can degrade over time or be damaged by surges, leading to unreliable performance.

Testing Difficulties

Testing GFCI and AFCI breakers reliably without specialized equipment is challenging (more on that below).

Higher Failure Rate

GFCI and AFCI breakers are inherently more prone to failure than standard breakers due to their complexity.

Age and Obsolescence

Older GFCI and AFCI technology may not be as sensitive or effective as newer designs.

Obsolete Panels



Finding Compatible Breakers

Finding any breaker for an obsolete panel can be difficult, leading people to consider used options.

Increased Risk

The older the panel, the more likely there are underlying issues that could contribute to breaker failure. Think about the condition of the bus bars, connections, and overall wiring.

Testing Used Breakers (The Dilemma)

You're right; reliably testing breakers, especially GFCI and AFCI, without specialized equipment is difficult:

Standard Multimeter

A multimeter can only check for continuity and voltage. It cannot verify the breaker's ability to trip under fault conditions.

GFCI Tester (Button Type)

These are limited tests. They only check the GFCI's ability to trip under a specific, pre-defined ground fault condition (usually 5mA). It doesn't test its sensitivity, speed of tripping, or overall reliability. These will NOT work with AFCI breakers.

AFCI Tester (Plug-In Type)

These simulate arc faults. However, they have limitations:

Specificity

They may only test for specific types of arc faults (e.g., series arcs). They might not detect all types of arc faults that the breaker is designed to protect against.

Dependence on Circuit

The test results can be affected by the circuit's wiring and load characteristics.

Limited Scope

They don't provide comprehensive testing of the breaker's internal electronics or its ability to respond to various fault conditions.

Ramp Testers (For GFCI)

These gradually increase the ground fault current to measure the actual trip point. They are better than the simple button testers but still don't provide a comprehensive test. Not for AFCI breakers.



Bench Testing (Specialized Equipment)

True, thorough testing requires specialized equipment that can simulate various fault conditions, measure trip times accurately, and assess the breaker's overall performance. This equipment is usually only available to breaker manufacturers or testing labs.

Inspector Concerns



Legitimate Concerns

An inspector is absolutely within their rights to question the installation of used breakers, especially GFCI and AFCI. Their primary responsibility is safety.

Code Compliance

Many jurisdictions have electrical codes that implicitly or explicitly discourage (or even prohibit) the use of used breakers.

Burden of Proof

The installer (or homeowner) bears the burden of proving that the used breaker is safe and functional. This is very difficult without proper testing documentation.

Liability

Using used breakers can increase your liability if a fire or injury occurs due to a breaker malfunction.

Recommendations and Considerations


Avoid Used GFCI and AFCI Breakers if Possible

This is the safest and most prudent approach. The potential risks outweigh the cost savings.2.

New Old Stock (NOS)

If you must use a breaker for an obsolete panel, look for "New Old Stock" (NOS) from a reputable supplier. This means the breaker is new, unused, and in its original packaging, but may be older. Still, NOS is generally preferable to truly used breakers.3.

Panel Replacement

If the panel is truly obsolete and you're having difficulty finding breakers, strongly consider replacing the entire panel. This is a more expensive option, but it provides a safer and more reliable electrical system.4.

Consult with a Qualified Electrician

Get professional advice from a licensed electrician who is experienced with older electrical systems. They can assess the situation, recommend the best course of action, and ensure that any work is done safely and correctly.5.

Documentation

If you do use a used breaker (against best practice), document everything: Source of the breaker Any testing you performed (even if limited) Reason for using a used breaker (e.g., no new options available)6.

Inform the Inspector

Be upfront with the electrical inspector about using a used breaker. Provide them with any documentation you have and be prepared to justify your decision.

In summary: While it's understandable to try to save money or find a solution for an obsolete panel, using used GFCI and AFCI breakers is generally not recommended due to the safety risks and difficulties in verifying their functionality. Prioritize safety and consider panel replacement or new-old-stock options whenever possible. Always consult with a qualified electrician and be prepared to address any concerns raised by the electrical inspector. Flag for review