Commercial Equipment Power & Dedicated Equipment Circuits

Before determining the electrical scope, OTC looks at the actual equipment requirements.

Important information may include:

• Voltage

• Phase

• Amperage

• Horsepower

• Minimum circuit requirements

• Maximum overcurrent protection

• Disconnect requirements

• Manufacturer instructions

• Equipment location

For larger or specialty equipment, approved cut sheets should be reviewed whenever available.

The electrical circuit should be designed around the equipment requirements rather than assumptions.

Many commercial loads should have their own electrical circuit rather than sharing general-purpose power.

Dedicated circuits are commonly installed for:

• Commercial appliances

• Refrigeration

• Kitchen equipment

• HVAC equipment

• Motors

• Pumps

• Compressors

• Production equipment

• Machinery

• Printers and specialty office equipment

• Chargers

• Dedicated technology equipment

A dedicated circuit gives the equipment a defined electrical source sized around its load.

One of the most common problems in existing commercial buildings is equipment being connected to whatever circuit was easiest to access.

That existing circuit may already serve:

• Receptacles

• Lighting

• Other equipment

• Appliances

• Multiple rooms

Adding another significant load can create:

• Overloads

• Repeated breaker trips

• Voltage problems

• Unreliable equipment operation

OTC traces and evaluates the available electrical system before deciding where new equipment should be connected.

Commercial equipment can require many different voltages.

Examples may include:

• 120V

• 208V

• 240V

• 277V

• 480V

The building having electrical power does not automatically mean it has the correct voltage available for the equipment.

OTC verifies what is available before the installation is planned.

Commercial equipment may be either single-phase or three-phase.

The equipment specifications determine what is required.

Three-phase power is common for:

• Larger HVAC equipment

• Motors

• Manufacturing machinery

• Compressors

• Pumps

• Commercial kitchen equipment

• Industrial systems

If the required voltage and phase are not available near the equipment, additional distribution or transformation may be necessary.

Sometimes the building has adequate electrical capacity but not the voltage required by the equipment.

A transformer may be used to provide the correct voltage.

A common commercial arrangement is:

480V Distribution → Transformer → 208Y/120V Equipment or Panel

Other transformer configurations may be used depending on the application.

OTC evaluates the upstream power, transformer size, location, ventilation, feeder requirements, and downstream equipment before installation.

Larger equipment may require a dedicated feeder rather than a standard branch circuit.

That can involve:

• Larger conductors

• Conduit

• New breakers

• Disconnects

• Local distribution

• Transformers

• New panelboards

The farther the equipment is from the electrical source, the more important the feeder design becomes.

Commercial buildings can place equipment a significant distance from the electrical room.

Long circuit and feeder runs may require consideration of:

• Conductor size

• Voltage drop

• Conduit routing

• Equipment load

• Physical access

OTC begins paying additional attention to voltage drop on longer runs, particularly around the 100-foot range and beyond depending on the load and system.

The actual conductor sizing is based on the complete installation—not distance alone.

Many pieces of commercial equipment require a disconnecting means near the equipment.

OTC installs and coordinates disconnects for equipment such as:

• HVAC units

• Motors

• Pumps

• Compressors

• Machinery

• Kitchen equipment

Disconnect type and location are selected around the equipment requirements and installation conditions.

Before adding a new equipment circuit, OTC evaluates more than whether there is an empty breaker space.

We look at:

• Existing panel load

• Proposed equipment load

• Feeder capacity

• Main breaker or upstream protection

• Panel condition

• Available breaker space

• Voltage and phase

A panel may have an empty breaker position but still not have enough electrical capacity for the new load.

If the existing panel has adequate electrical capacity but no physical breaker space, the solution may be:

• A new subpanel

• A larger panelboard

• Reorganization of the existing distribution

A full panel does not automatically mean the building needs a larger service.

OTC determines whether the limitation is physical space or actual electrical capacity.

Large equipment can sometimes exceed what the existing electrical system can support.

This is especially common with:

• Manufacturing equipment

• Large commercial kitchens

• Heavy machinery

• Major HVAC additions

• Multiple chargers

• Production expansions

A project that begins as one equipment connection may require:

• New subpanel

• Larger feeder

• Transformer

• Panel upgrade

• Switchgear modification

• Service upgrade

OTC identifies these limitations before installation whenever possible.

The equipment location can significantly affect the electrical scope.

A machine located directly beside an electrical room is very different from the same machine located several hundred feet away.

OTC considers:

• Conduit routing

• Structural conditions

• Ceiling height

• Wall construction

• Equipment access

• Existing pathways

• Future maintenance

when planning the installation.

Restaurant and commercial kitchen equipment often requires dedicated electrical circuits.

Examples include:

• Ovens

• Fryers

• Dishwashers

• Refrigeration

• Ice machines

• Coffee equipment

• Warmers

• Specialty appliances

Kitchen equipment schedules should be reviewed carefully because equipment substitutions can change voltage, phase, or circuit requirements.

OTC provides electrical power for commercial mechanical equipment including:

• Rooftop units

• Mini-splits

• Exhaust fans

• Make-up air equipment

• Pumps

• Motors

• Compressors

Electrical installation is coordinated with the approved mechanical equipment so breaker, conductor, disconnect, and voltage requirements match the equipment being installed.

Industrial and warehouse equipment may place significantly larger loads on the building.

OTC can provide electrical infrastructure for:

• CNC equipment

• Production machinery

• Conveyor systems

• Packaging equipment

• Welders

• Compressors

• Pumps

• Motors

• Specialty manufacturing equipment

These projects should be evaluated before the equipment is purchased whenever possible.

Buying the machine first and checking the building power afterward can turn a simple equipment installation into a major electrical upgrade.

Moving existing equipment within a building can still require new electrical work.

The new location may require:

• Longer feeders

• New conduit

• New disconnects

• Different panel distribution

• Circuit extensions

• Transformer changes

OTC verifies the existing equipment requirements and the power available at the new location before reconnecting it.

When installing new distribution for equipment, it may make sense to consider reasonable future expansion.

Depending on the operation, that may include:

• Additional machinery

• Another production line

• Larger equipment

• Future HVAC

• Additional chargers

OTC can plan panel space, conduit pathways, and distribution with future additions in mind without unnecessarily oversizing the current project.

A typical commercial equipment-power project may involve:

• Equipment specification review

• Existing electrical evaluation

• Voltage and phase verification

• Capacity review

• Circuit or feeder sizing

• Conduit installation

• Panel or breaker modifications

• Transformer installation

• Local disconnect

• Final equipment connection

• Testing

• Labeling

The exact scope depends on the equipment and the building.