Is a split bus panel still safe to use?

Split bus panels can still be safe to use if they're in good condition and meet current electrical demands, but they have significant limitations that often make replacement the better choice for New Brunswick homeowners.

A split bus panel, common in homes built from the 1960s to early 1980s, has two separate bus sections instead of a single main breaker. The top section feeds major appliances like electric heat, hot water, and dryer, while the bottom section has a main breaker controlling general household circuits. These panels were legal when installed and can still function safely if properly maintained.

The main concerns with split bus panels include limited expansion capacity (typically maxing out at 100 amps), difficulty adding new circuits for modern electrical needs, and potential confusion during emergencies since there's no single main shutoff. In New Brunswick's climate, where backup generators are increasingly popular due to ice storms, the lack of a main disconnect can complicate generator installation. Additionally, many split bus panels use breaker types that are becoming harder to find, making future repairs more expensive.

TSANB doesn't require you to replace a functioning split bus panel, but any major electrical work might trigger requirements for upgrades. If you're planning an EV charger installation, adding circuits for a heat pump, or installing a whole-home generator, the limited capacity will likely necessitate a panel upgrade anyway. Most split bus panels also lack the AFCI and GFCI protection required for modern electrical safety standards.

Safety-wise, the biggest risk is that split bus panels often coincide with other aging electrical components like aluminum wiring or deteriorating connections. If your panel shows signs of corrosion, burning smells, warm breakers, or flickering lights, these are immediate safety concerns requiring professional attention.

For New Brunswick homeowners, upgrading to a modern 200-amp panel typically costs $2,000-$3,500 and provides significant benefits: full electrical capacity for modern appliances, proper emergency shutoffs, easier generator connections, and compliance with current safety standards. Given NB's harsh weather and frequent power outages, having a robust electrical system with proper main disconnect capabilities is particularly valuable.

If your split bus panel is functioning well and you're not planning major electrical additions, it can remain in service. However, have a licensed electrician inspect it annually and consider replacement if you're experiencing any electrical issues or planning home improvements.

Need an electrician to evaluate your panel? New Brunswick Electrical can match you with local TSANB-licensed professionals for a free assessment of your electrical system.