You're right to be concerned and thorough. While the Zinsco panels are the primary red flag, let's address the GE/Sylvania disconnects to give you a complete picture

Yes, the GE/Sylvania disconnects could be a hazard, though likely to a lesser degree than the Zinsco panels.

Here's the breakdown: Age

The disconnects are the same age as the Zinsco panels, about 43 years old. This is beyond the typical expected lifespan of most electrical equipment. Components degrade over time due to heat cycling, corrosion, and general wear and tear.

Possible Design Issues

While GE/Sylvania disconnects generally don't have the well-documented catastrophic failure issues associated with Zinsco, there have been reported instances of similar issues of breakers not tripping when they should, especially with older models.

Condition Matters Most

The most important factor is the current condition of the disconnects. Look for these signs of trouble:

Corrosion

Especially around the breaker terminals, enclosure, or on the breaker itself. This is extremely common outdoors.

Rust

Similar to corrosion and a very common issue

Overheating

Discoloration, melting, or burning smells around the breaker or enclosure.

Loose Connections

This can be hard to spot visually, but evidence of arcing (blackened or pitted terminals) suggests loose connections. This is extremely dangerous.

Physical Damage

Cracks in the enclosure, damaged handles, etc.

Stiff or Sticky Breaker Operation

If the breaker is hard to switch on/off, it may be internally failing.

Arcing/Sparking when operated

Replace IMMEDIATELY

Upgrading Considerations

Since you're already replacing the Zinsco panels, you're incurring the labor costs of a service change anyway.

Recommendations


Thorough Inspection

Carefully inspect the GE/Sylvania disconnects. Look closely at the breaker terminals, bussing, enclosure, and any visible wiring. Use a bright flashlight.2.

Megger Test

If you have access to a megger (insulation resistance tester), you can perform a test on the conductors and the breakers themselves to verify the integrity of the insulation.3.

Load Test

If possible, performing a load test on the breakers to verify that they trip at the correct load would be helpful.4.

Best Practice

If your budget allows, replace the GE/Sylvania disconnects along with the Zinsco panels. This is the most proactive and safest approach. It eliminates any lingering concerns about the old disconnects and provides a completely new and code-compliant service.5.

If Replacing

When replacing, consider using a modern, high-quality disconnect with a NEMA 3R rating for outdoor use. Also, ensure it's properly sized for the load and future needs.6.

Document Everything

Take photos and document your findings, especially if you decide not to replace the disconnects at this time. This provides a baseline for future inspections.

In summary

While GE/Sylvania disconnects are not as notorious as Zinsco panels, their age and potential for failure warrant careful inspection. Replacing them during the Zinsco panel replacement is the safest and most recommended approach. At the very least, a thorough inspection is crucial to identify any signs of existing problems.

Disclaimer: I am an AI chatbot and cannot provide professional electrical advice. Always consult with a qualified and licensed electrician for any electrical work or safety concerns. Your local electrical codes and regulations should always be followed.* Flag for review