What to Expect During an Electrical Panel Upgrade

What a panel upgrade really involves

Homeowners often picture a panel upgrade as a quick “box swap.” In reality, it’s a careful transfer of every circuit in your home to new, properly protected equipment—plus safety checks that ensure the whole system is grounded and bonded correctly. This guide explains what happens before, during, and after a panel upgrade so you know what to expect.

Step 1: the pre-upgrade assessment

Before upgrade day, we verify:

• Existing service size (100A/200A) and overall capacity
• Panel condition (heat, corrosion, damaged bus bars)
• Circuit count and labeling needs
• Grounding and bonding status
• Any planned additions (EV charger, generator, remodel circuits)

If you’re budgeting, start with Electrical Panel Upgrade Cost in Broken Arrow.

Step 2: permits and coordination

Panel upgrades are typically permitted projects. Permits and inspections are part of doing it the right way—especially if you ever sell the home. If the utility needs to disconnect/reconnect power for a service upgrade, we coordinate that schedule so your outage window is predictable.

Step 3: upgrade day (what happens on site)

On upgrade day, power is shut off for safety. Then the work follows a controlled sequence:

1. Site protection: protect floors and work area, confirm the plan and outage window.
2. Remove old equipment: safely de-energize and remove the existing panel components.
3. Install the new panel: mount, level, and prepare the new panel and service connections.
4. Transfer circuits: move each branch circuit, verify conductor condition, and terminate correctly.
5. Install breakers: breakers are sized for circuit requirements—this is where code and safety matter.
6. Label and test: label circuits clearly and test operation under load.

How long will the power be off?

Most panel upgrades are completed in one workday once scheduled. The exact outage time depends on circuit count, condition of existing wiring, and whether service equipment outside the panel needs changes. We’ll set expectations in advance so you can plan for refrigeration, work-from-home, and family schedules.

What we check for safety during the upgrade

• Correct torque on terminations (loose connections create heat)
• Neutral/ground separation and bonding integrity
• Grounding electrode system and bonding jumpers
• Breaker sizing and circuit loading
• Panel labeling for future troubleshooting

After the upgrade: inspection and documentation

After installation, inspection provides a second set of eyes and documentation. That matters for resale confidence and for protecting your investment in a major electrical upgrade.

What you can do to prepare

• Plan around the outage window (work, cooking, refrigeration)
• Clear access to the panel and surrounding area
• List any circuits that have been problematic (trips, flicker, warm outlets)
• Share upcoming plans (EV charger, generator, remodel) so we size correctly

Common add-ons during a panel upgrade

• Whole-home surge protection
• EV charger circuit planning
• Generator transfer equipment prep

Bottom line

A panel upgrade is a safety and capacity project. Done correctly, it improves reliability, makes future additions easier, and reduces risk from overheated connections or outdated equipment. If you’re ready to schedule in Broken Arrow or nearby cities, call or text Arrow Electric Co.

Related reading

• Repair vs Replace: Electrical Panel
• 100 Amp vs 200 Amp Panels

What happens if we find issues during the transfer?

Older homes sometimes have brittle insulation, crowded conduits, or previous DIY work that needs correction. If we find a conductor that’s damaged or a circuit that’s improperly sized, we don’t “hide it and move on.” We pause, explain what we found, and recommend the safest correction. In most cases, the fix is straightforward and prevents future overheating or nuisance trips.

A more detailed timeline (typical)

• Morning: confirm scope, shut down power, remove old equipment, mount the new panel.
• Midday: circuit transfer, breaker installation, grounding/bonding checks.
• Afternoon: labeling, testing, and verification that major loads start and run correctly.
• End of day: cleanup and review of the new panel layout with you.

How to plan for the outage

If the project is same-day, the biggest inconvenience is the outage window. A few practical tips:

• Keep refrigerator/freezer doors closed as much as possible.
• Charge phones/laptops the night before.
• If you work from home, plan to be mobile for a few hours or use a backup hotspot.
• Let us know if you have medical equipment that requires power so we can plan appropriately.

What a “good” finished panel looks like

• Neat conductor routing with clear separation of neutrals/grounds where required
• Labels that match real rooms and appliances (not “lights” x 12)
• Breakers sized correctly for the circuits they protect
• Space for future circuits so you don’t end up with shortcuts later

Same-day assessment and scheduling

If you’re dealing with repeated tripping, heat, or flicker and you suspect the panel, we can often assess it the same day (schedule permitting) and tell you whether you need a targeted repair or a full upgrade. The goal is clarity before you commit to a major project.

Questions to ask before you approve a panel upgrade

• How many spaces will the new panel have, and what’s the target amperage?
• Are AFCI/GFCI breakers included where required?
• What grounding/bonding updates are included?
• Will the circuits be fully labeled and tested under load?
• How will permits and inspection be handled?

After the upgrade: your homeowner checklist

• Confirm the panel directory makes sense to you.
• Test key loads (HVAC, range, dryer, garage door).
• Ask where the main shutoff is and how to use it safely.
• Keep the inspection record with your home documents.

If you’re ready, visit our panel upgrade service page and reach out.