Tag Archives: Zinsco

3 QUESTIONS: STRUCTURAL ELEMENTS WITH ARMSTRONG ELECTRICAL SOLUTIONS LLC

Every month, we seek to bring our readers insight from the worlds of home construction, home repair, and home maintenance straight from local Northwest Washington contractors in a segment we call “3 Questions.” Yep, you guessed it: we ask three questions, and the contractors answer them.

This month, we talk about electrical issues with Stan Armstrong, owner of Armstrong Electrical Solutions LLC in Eastsound.

Q1: Sylvania Zinsco and Federal Pacific electrical panels are frequently called out as potential safety hazards in home inspection reports.  Do you recommend replacement of these panels and, if so, what’s a typical replacement cost for a 200-AMP panel?

Yes, those circuit breakers have had issues tripping when there is an over-current situation on the conductor. The Zinsco breaker could melt to the bus bar and never trip. Poof, a fire in your panel or even on your conductor or at the devices it feeds. 

Secondly, as the electrical panel world has evolved to a Combination Arc-Fault Circuit Interrupter (CAFI), its protection was required in Washington State for permits acquired after June 2014. All single-pole residential interior circuits must be Combination Arc-Fault Circuit Breakers (this provides protection against overloads, short circuits, parallel arcing, and series arcing). 


If you change a device or extend a circuit over six feet, the circuit is required to be upgraded. 

A new 200-AMP electrical panel will typically cost between $1,300 – $3,000 depending on the number of circuits and complexity. If you’re buying an old home, that correction should be a bargaining chip as you will want to replace it.   

Q2: Separating grounds from neutrals is typically recommended for subpanels, although older subpanels don’t always observe this practice.  What’s your advice if grounds aren’t separated from neutrals in a subpanel?

This depends on if the subject panel is the service panel or a feeder panel. Service panel grounds and neutrals are always bonded together. 

Prior to the 2002 code change, the neutral conductors in feeder panels were bonded together, no 4th conductor, and the ground conductor was installed in the conduits. 

After 2002, all installations that involve feeder panels—a panel fed with a current limiting interrupter upline—shall have the neutrals isolated or floating, whereas the ground conductors are bonded to the metal panel body. If that panel is not attached to the home, it is also required to have two ground electrodes connected by a ground electrode conductor. 

Q3: When testing outlets, my test equipment frequently discovers “hot-neutral reverse,” which typically indicates a loose neutral in the circuit.  In your experience, why does this happen?

When amateurs/handymen install electrical wiring, they may be confused and not know the difference between a non-grounded conductor, or hot conductor, and the neutral that eventually feeds back to ground, known as the grounded conductor. The appliance or device switch will turn off the neutral return path but leave the appliance energized, resulting in possible electrocution. 

BONUS: Do you have any pet peeves or electrical advice you’d like to share with our audience?

When we find short conductors (wires) in a junction box, we often know the homeowner or amateur has been in there. Trained professionals generally have 6-9” coming out of the junction box. 

Another Issue: Bigger circuit breakers beyond what the conductor is designed to handle.

Someone may put a 20-AMP breaker on 15-AMP circuit, with a 14-American wire gauge (AWG) conductor because their breaker continues to trip. The conductor could become overheated and is a safety issue. 

About Armstrong Electrical Solutions LLC

Armstrong Electrical Solutions LLC (AESLLC) was created with a vision to provide innovative electrical solutions for both the simple and complex home. The company uses durable, time-trusted products, and incorporates technological solutions when appropriate. 

The business serves clients on Orcas Island, its outer islands and the San Juan Islands in general. Owner Stan Armstrong has been involved in the construction/electrical industry since 1984. Recently, the company focus has been developing electrical solutions for high-end residential construction clients.

For more information, visit www.armstrongesllc.com

A big “thanks” to Stan for his responses!

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