Commercial Main Lug Sub Panel Installation

When a commercial space runs out of breaker positions, the fix is rarely a bigger main panel. A main lug sub panel fed from the existing service puts new circuit capacity where the load actually is: a new tenant suite, a kitchen line, a row of machines or a server room. No Shorts Electric Inc installs new sub panels and removes and replaces outdated ones for businesses across Nassau and Suffolk County, with every circuit tested for shorts before the panel is energized and handed back.

What a main lug sub panel does for a commercial property

A main lug panel has no main breaker of its own; it is protected by a breaker in the panel that feeds it. That makes it a clean way to distribute power to a part of the building that needs its own group of circuits:

• A tenant fit-out where the suite needs its own panel for lighting, receptacles and equipment
• A commercial kitchen, bar or coffee line with several dedicated appliance circuits
• Warehouse and shop equipment, compressors, conveyors or charging stations far from the main service
• A back office or server room that should be isolated from the rest of the floor
• Additions, mezzanines and converted storage space being brought into use
• Multi-family common areas, laundry rooms and mechanical rooms

The service includes installing or replacing the sub panel enclosure, the breakers, the feeder connection to the main panel, and testing of every circuit the panel serves.

Signs an existing sub panel should be replaced

• Breakers that trip under normal load or no longer reset firmly
• No spare positions, with tandem breakers or doubled-up conductors filling the gaps
• Rust, scorching, a warm panel face or a buzzing sound
• An obsolete panel brand for which replacement breakers are unavailable
• Equipment or tenant changes that have outgrown the panel's rating
• Inspection, insurance or lender comments on the electrical system during a sale or refinance

How the work is planned around your operations

Replacing a sub panel means the circuits it feeds go dark while the work is done, so scheduling is the first conversation. We walk the space with you to list what each circuit serves, flag refrigeration, point-of-sale, IT and life-safety loads, and set a window that works for the business, which for many clients means an early morning, an evening or a weekend. The rest of the building stays live; only the feeder to the sub panel is de-energized.

Once the new panel is set and wired, we test every circuit for shorts, confirm each breaker matches the load it protects, and fill in the panel directory so your facilities staff and any future electrician can read it. You get power back in a known, documented state.

Code, permits and inspection

Panel work in a commercial building usually requires a permit and an inspection, and where the town requires them we file the permit and schedule the inspection as part of the job. We size the feeder and its breaker to the panel, maintain the working clearance the code requires in front of the equipment, and bond and ground the panel correctly for a sub panel rather than a service. We file the permit and schedule the inspection as part of the job.

Why businesses trust No Shorts Electric with panel work

• Family-run and licensed since 1984, holding Nassau County electrical contractor licenses 203146, 203147 and 1147253
• Fully insured for work in occupied commercial and multi-family buildings
• Upfront pricing and free estimates, with the scope written out before you commit
• 2-year workmanship warranty on the installation
• Four decades of panel work in the same Nassau and Suffolk towns your project will be inspected in

Get a commercial sub panel estimate

Tell us what the new or replacement panel needs to serve and send photos of the existing panel and its location. Call (516) 915-1234 or Request a commercial estimate.