Selecting the Right Electrical Conduit for Commercial Buildings

Selecting the Right Electrical Conduit for Commercial Buildings. Commercial spaces have distinct requirements, as well as different electrical wiring demands, then houses and residential structures. Not only that but when it comes to commercial settings, there are various types of conduit pipe, each suitable for a different application.

Office equipment and electronics, for example, may necessitate a different electrical conduit architecture than heavy-duty machinery or warehouses. When it comes to commercial wiring, there are various variables to take into account aside from the electrical demands and usage. One of the most critical issues is safety since any flaws in the electrical wiring can endanger personnel and halt corporate operations.

Let us explore various options for electrical conduit.

Raceways & Conductors 

The NFPA 70 controls commercial wiring, like residential wiring, National Electrical Code, especially Chapter 3 of the code. Except for any adjustments by other articles in Chapter 3, NEC Article 300 governs all wire installations, general requirements for wiring methods and materials.

One of the most prevalent electrical wiring methods is the raceway and conductor system. This method consists of an electrical conduit with many insulated phases depending on the NEC standards and procedures.

Each installation follows the property’s requirements and design plans. The most frequent forms of conduit pipe is THHN/THWN (thermoplastic high heat-resistant nylon jacket/thermoplastic heat and water-resistant nylon jacket) or XHHW (XLPE high heat-resistant and water-resistant) in copper or aluminium. Branch circuits generally define copper, whereas feeders specify aluminium.

The following are the most prevalent types of raceways used in commercial applications:

  • EMT is an abbreviation for electrical pipes and tubing, the most popular raceway in commercial construction. It is a thread less steel tube with thin walls, a galvanised outside, and a corrosion-resistant inside.
  • FMC stands for flexible metal conduit, and it is available in a variety of metal kinds and wall thicknesses.
  • IMC stands for intermediate metal conduit, a thin-walled variant of the RMC with a corrosion-resistant internal coating and a galvanised outside.
  • PVC (rigid polyvinyl chloride) conduit is available in numerous kinds but most commonly used as Schedule 40 or 80, referring to the thickness of the wall, for subterranean applications immediately buried or concrete encased.
  • RMC (Rigid Metal Conduit) also known as RGS or GRC is a galvanised electric conduit with a thick wall and zinc external coating that ensure maximum physical protection.

Raceways are not the same as cable trays. The latter is, in reality, a structural system used to organise & physically support conduit pipe, and wire systems.


Busways (bus ducts) are yet another sort of commercial electrical pipe. A busway is a metal-enclosed racetrack with factory-installed bus bars.

There are two sorts of busways: feeder style and plug-in style. These arrangements can feature insulated or bare conductors.

The use of busways as an electrical conduit or wiring solution has four significant advantages:

  1. Large ampere rating availability, ranging from 60 to 4,000 Amps;
  2. Minimal influence from overall voltage drop with bus duct applications;
  3. Small size as compared to several conduits for the same load;
  4. The flexibility to add and adjust load take-offs with plug-in busways.

Cable Assemblies

Another frequent sort of electrical pipes system is a premade cable assembly. Manufactured cable assemblies are available as conventional goods, but you can find them with unique conductor combinations. The standard for these assemblies is THHN/THWN or XHHW-2 (copper or aluminium) conductors.

The following are the most typical kinds seen in commercial buildings:

  • Armoured cable (type AC) is the package that includes a metallic sheath made of either steel or aluminium armour, which also serves as a ground route. It has is applicable in branch circuits between luminaires and power outlets.
  • Metal-clad cable (MC) is a set of conductors enclosed in a metallic sheath of steel or aluminium interlocking armour. MC works with an outer PVC jacket for direct burial or damp site.
  • Mineral-insulated, metal-sheathed cable (type MI) is a set of copper conductors enclosed in a seamless copper sheath insulated with magnesium oxide. It is for specialist applications such as NEC 700 emergency system compliance.
  • Non-metallic sheathed cable (types NM, NMC, NMS) is a set of conductors constructed within a non-metallic. PVC-insulated sheaths with a nylon jacket are commonly known as Romex.

Upgrade Your Commercial Buildings By Selecting The Right Type Of Electrical Conduit!

A well-chosen electrical update may significantly increase the value and appeal of any company. You will be surprised at how much of a difference the correct electrical update can make in your house or company.

Always ensure that when you hire an expert to improve your house and decide to take your improvements to the next level, the technician at the firm has a piece of good working knowledge and the expertise to advise you in electrical conduit mechanisms properly.

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