Commercial wiring is an electrical installation relating to supply of the electricity for business purposes. The whole concept of this type of wiring is based on the usage of a three-phase design, which means cables have four of five wires instead of only two.

In this three-phase electrical system, there are two smaller legs used for running 120 volts each and also a binder leg running 208 volts. This kind of effective setup allows each wire to bear less workload and also helps in creating a higher output when working together.

As the power demand is increasing in an office environment, it gave rise to higher voltage requirements. TTHT (thermoplastics high heat resistant nylon coated) is a type of insulation often used in commercial wiring, which protects it from any kind of damage. In commercial buildings, the wiring is done through a tube-like structure called conduits for better use.

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Electrician Installing Fibre Optic Cables

Other special outlets may also be installed in some special cases. Factors including the type of building construction, type of ceiling wall and, floor construction, wiring methods, and installation requirements have to be specifically considered before the installation work to be done for residential or commercial wiring.

With regards to business electrical wiring establishment projects, it is imperative to follow wiring outlines. These outlines are useful in an unexpected way. The electrical diagrams show how various components are to be fixed. Your electrical project worker can monitor all the wires and where they require to be introduced. The outline likewise gives important data through the usage of different colors of wires for positive, negative and neutral.

Commercial spaces require an entirely different system of electricals in order to function. Office equipment and electronics wiring and cable organization may differ from that of heavy-duty machinery or warehouses.
One of the most important factors to consider is safety, as flaws in the electrical wiring can endanger employees and halt business operations.


Three-phase Electricity

Three-phase power is more commonly used in commercial electrical wiring than single-phase power. Three live cables, one neutral wire, and one earth cable make up this system. This implies that more current can be transmitted through circuits, supplying sufficient power to run machines and equipment.

A three-phase power system has a balanced load and is significantly more efficient than a single-phase power system.


The wiring in a commercial building must be conveniently accessible. The majority of your home’s wiring will be hidden – you’ll only notice your plugs and fuse box. In a commercial structure, however, the wiring must be conveniently accessible for maintenance, repair, and shut-off.

This demands a unique installation strategy. As more wiring becomes exposed, contractors must consider these new guidelines to ensure the safety of everyone on the job site.

The Electrical Load

Energy is used more in commercial properties than in residential properties. Diverse types of equipment, such as motors, cooling components, and alarms, serve different roles. These systems use more power, signaling that the system design is different.


The primary distinction between commercial and residential electrical wiring is based on the equipment configuration, energy loads, and their demands. The designs differ from those of a residential building in several ways depending on the nature of its operations. What is most important is the size of the machine that will be used.

Industrial construction companies and factories will undoubtedly have a high demand for such heavy-duty electrical wiring. The type of commercial wiring used is usually determined by the type of industry to be serviced. The type of commercial electrical wiring required will vary depending on the industry to be serviced.

Wiring can range from simple wiring for commercial space to multi-faceted wiring done in large factories that run complex machinery and computers. In any case, regardless of size or operation, the process of electrical wiring must adhere to relevant electrical codes and be carried out only by a licensed, qualified, and skilled electrician equipped with proper safety tools.



  • The requirement of essential electrical codes.
  • The kind of buildings and all the power requirements.
  • The specified financial budget of the wiring.
  • The geographical area where the electrical wiring is to be done.
  •  Impact on the appearance of the facility.
  • The necessity of a generator at the time of backup supply.
Electrician Connecting Wires


A variety of new buildings are now using advanced electrical and electronic devices. For which the contractors need to design a wiring representation that will be capable enough to deliver power to wide and diverse appliances including both traditional and modern electrical loads.

​The primary motive of this kind of wiring is to provide a means of supplying power to the monitoring and control devices, for instance, wireless sensors, thermostats, the IoT, and several other web-based technologies.



  • The electrical service line of the building.
  •  The power distribution systems.
  •  Several office equipment including computers, servers, copiers, shredders.
  •  Then the lighting both interior and exterior including general lightings, decorative, security, signs and show windows, etc.
  •  Different transportation factors such as elevators, moving walkways and escalators.
  •  Computer networks and telephone lines are the communication wiring which should also be included.
  •  Automatic control system.
  •  Different security equipment such as CCTV, security alarms, fire detection, and others require quality wiring.
  •  Central air or space cooling
  •  Availability of hot water order
  • Continuous power supply
  •  Reinforcement generators
  •  Sustainable energy

The sort and utilization of a structure impact the kind of wiring to utilize, and the structure proprietor and electrical project worker ought to consider flow and future force prerequisites while deciding the size of transmitters, raceways, safeguarding staff and, different necessities.

Electrician Examining Fusebox With Multimeter Probe
Commercial Electrician Checking Capacitor Of An Establishment

Frequently Asked Questions (FAQs)

What type of cables/wires are commonly used in commercial building electrical wiring?

Commercial buildings necessitate far more complex electrical systems than residential homes. There 3 common types of commercial electrical wiring:

Cables for Communication
Communication cables are used in computer-like devices such as CCTV cameras, telephones, intranet, internet, and other radio signal-using devices to send electric signals.

Cables with Armor
PVC or metal shields are used to shield or cover armored cables. This armor protects cables against high-pressure washing, extreme heat or cold, and corrosion.

Cables for Low Voltage
Low voltage cables are constructed with aluminum or copper conductors surrounded by various insulation and shielding compounds. They are used to transmit electricity with alternating current (AC) voltages ranging from 50 to 1000 volts and direct current voltages ranging from 75 to 1500 volts (DC).

How do commercial electrical systems work?

Depending on the size of the commercial property, the electrical system of the building requires a bigger electrical capacity to function. An organized electrical system is essential to power a commercial building.

This ensures that the electricity is working properly across the facility. It also assures that the building is free of electrical risks and that no one’s safety is jeopardized.

What is the difference between residential and commercial electrical wiring?

In terms of energy requirements, load demands, and equipment configuration, commercial and domestic electrical wiring are diametrically opposed. They also necessitate various types of materials and techniques.
A residential wire is always fully insulated. This is to protect occupants from electric shock. It is a three-wire system consisting of one phase and one 120 volts. Appliances that draw a lot of electricity like A/C and fridge require 240-volt two-phase power.
In commercial applications, this wire is often carried in conduits or ceiling rafters for easy access. The wire is usually hidden behind walls and in attic crawl spaces. Most commercial wiring is three-phase. Three-phase electrical systems include two smaller 120-volt legs and one bigger 208-volt leg.
This design minimizes effort on each wire while increasing output when combined. More efficient and longer-lasting equipment. It is connected to the growing power consumption in the workplace. Commercial wire often has more insulation. This keeps corrosive substances and gases away from the wires. Special outlets for power-hungry or sensitive equipment may be installed.

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