Are you wondering if Romex can be used in commercial buildings?
If so, you’re not alone.
Many people want to know the answer to this question, and we’ve got it right here!
If a commercial building has a type III, IV or V construction type, Romex can be used without any restrictions.
Read on to find out everything you need to know about using Romex in commercial buildings.
What is Romex?
Romex is a type of nonmetallic sheathed wiring that is commonly used in residential and light commercial applications.
It is made up of two or more insulated conductors, a bare ground wire, and a nonmetallic outer jacket.
Romex has been around since the early 20th century and is one of the most popular types of wiring used in buildings today.
It is very easy to install and is cost-effective, making it ideal for both DIYers and professional electricians.
It is also UL listed for use in both residential and certain commercial applications, as long as it meets the requirements set out by the National Electrical Code (NEC).
What is the difference between residential and commercial wiring?
When it comes to wiring, there are major differences between residential and commercial applications.
Residential wiring typically uses Romex or MC cabling which is approved for use in residential buildings.
On the other hand, commercial structures have more stringent requirements and often require the use of TTHT (Thermoplastic High Temperature) wire.
This type of wire is designed to withstand higher temperatures and thus more suitable for commercial buildings.
Additionally, commercial buildings may require more stringent safety regulations such as higher water resistance, fire ratings, and other requirements.
Therefore, it’s important to understand the differences between residential and commercial wiring before attempting to install any type of wiring in a commercial building.
Can You Run Romex In Commercial Building?
Yes, Romex can be used in commercial buildings; however, some restrictions apply.
According to the National Electrical Code (NEC) 334.12(A)(1), NM cable is not allowed as open runs above drop ceilings in non-dwelling occupancies.
Industrial buildings, however, may use Romex in open runs when installed with additional protection.
The most important requirement is that all wiring must be installed to meet the appropriate standards and codes.
Additionally, if a commercial building has a type III, IV or V construction type, Romex can be used without any restrictions.
It is important to note that NM B cable is not allowed in any commercial application; thus, it must be totally excluded from use in any building.
Can You Run Romex In A Commercial Drop Ceiling?
No, you cannot run Romex in a commercial drop ceiling.
According to NEC 334.12(A)(1), Romex is not allowed as an open run above drop ceilings in other than one and two family and multifamily dwellings.
This means that if you are dealing with a commercial building, Romex is not allowed above the ceiling.
Instead of using Romex, industrial wiring such as TTHT should be used instead.
It is important to check with your local building codes and regulations before running any type of wiring in a commercial building.
What Says National Electrical Code 334.12 (A)(1)
According to the National Electrical Code (NEC) 334.12 (A)(1), the use of Type NM and Type NMC cables is prohibited in commercial applications, regardless of mixed-use occupancy.
This means that Romex is not allowed as open runs above drop ceilings in any commercial building other than one- and two-family dwellings or multifamily dwellings.
The requirements for using Romex in commercial buildings include the fact that it can only be used in the aforementioned residential settings.
Additionally, any wiring used for commercial applications must meet certain requirements, such as being covered or encased in conduit or other protective materials.
The risks associated with Romex in commercial buildings include potential safety hazards due to improper wiring and fire hazards due to inadequate protection against short-circuiting or overloading.
Requirements For Using Romex In Commercial Buildings
In order to use Romex in commercial buildings, several requirements must be met.
Firstly, the building must be of type III, IV, or V construction.
If the building is of a combustible construction, then Romex may not be used.
Secondly, Romex should not be run above a suspended ceiling in a commercial application, as this is not allowed by the National Electrical Code 334.12 (A)(1).
Finally, if the local jurisdiction prohibits its use in any form, then it must not be used regardless of the type of construction.
When it comes to ensuring safety and compliance with regulations, it is important to always check with your local jurisdiction before using Romex cable for commercial applications.
Misconceptions About Romex In Commercial Buildings
There are a few misconceptions about using Romex in commercial buildings.
One common myth is that it cannot be used in buildings of any height.
This is not true; Romex is allowed in any building that is type III, IV, or V.
It does not matter if the structure is residential or commercial.
Another myth is that Romex must be installed in walls only.
While it is true that Romex should not be suspended from a ceiling, it can be installed in walls as long as the proper measures are taken to protect it from damage.
Additionally, it should not be placed near water lines or other sources of moisture.
Finally, NM-B cable can be used in commercial applications as long as it meets the requirements set forth by the National Electrical Code 334.12 (A)(1).
What Are The Risks Associated With Romex In Commercial Buildings?
When using Romex in commercial buildings, there are some risks involved.
Romex is not as fire-resistant as other types of wiring and does not meet some building codes for use in commercial buildings.
Additionally, Romex is not as durable and is more prone to damage from regular wear and tear.
This can cause electrical issues and potentially lead to fires if not installed correctly.
Moreover, improper installation or using Romex in certain locations can be a violation of the National Electrical Code (NEC).
It is important to be aware of the risks associated with using Romex in commercial buildings and that if you choose to use it, it must be properly installed and up to code standards.
What Type Of Wire Is Used In Commercial Buildings?
When it comes to commercial buildings, the type of wiring used depends on the building type and its intended use.
The most common wire used in commercial buildings is Type NM (Non-metallic) cable, also known as Romex.
This type of wire is allowed by the National Electrical Code (NEC) and is suitable for use in Type 3, 4 and 5 construction.
In addition to NM cable, other types of wiring such as TTHT (Tin-Coated Copper Wire) is also allowed for use in commercial applications.
Each type of wire has its own unique benefits and should be chosen based on the specific needs of a particular building.
What Is TTHT?
TTHT stands for “Thermoplastic, High-heat resistant, nylon coating” and is a type of commercial wiring often used in applications that require a lot of energy, such as air conditioning units.
This type of coating is much tougher than the Romex cable used in residential wiring and provides extra protection against wear and tear.
As previously mentioned, Romex is allowed in some commercial buildings up to the third floor, as long as it is properly protected through the holes in the building.
TTHT coating is the preferred method for commercial applications, as it offers the highest level of protection for sensitive equipment.
What Building Types Can Romex Be Used?
Romex can be used for residential construction in both combustible and noncombustible buildings.
For commercial buildings, the National Electric Code (NEC) 334.12(A)(1) states that NM cable, including Romex, can be used in Type III, IV, and V construction as long as it is not exposed.
However, this does not apply to Type I and II construction which must use other wiring standards like THHN or TFFN.
Additionally, certain locations such as hazardous locations cannot use Romex.
While it can be tempting to use Romex due to its affordability and ease of installation, it is important to note that using NM cable in buildings where it is not permitted could potentially cause safety hazards.
What Is The Most Common Commercial Wiring Standard Used Today?
The National Electrical Code (NEC) is the most commonly used standard for commercial wiring.
This code sets the minimum requirements for electrical safety in commercial buildings, including the use of Romex cable.
Romex cables are approved for use in commercial buildings provided they meet the requirements of NEC 334.12(A)(1), which states that it should be used only in dry locations and protected from physical damage.
It is important to remember that the NEC is only a minimum requirement and that more stringent requirements may be required by local codes or by electrical inspectors.
Additionally, it is important to use TTHT cables when running Romex in drop ceilings or other exposed areas.
TTHT cables are designed to withstand impacts and provide a higher level of safety than NM cables.
Conclusion
Romex is not allowed as open runs above drop ceilings in any commercial building other than one- and two-family dwellings or multifamily dwellings.
For commercial buildings, the National Electric Code (NEC) 334.12(A)(1) states that NM cable, including Romex, can be used in Type III, IV, and V construction as long as it is not exposed.
TTHT coating is the preferred method for commercial applications, as it offers the highest level of protection for sensitive equipment.
Best Wishes!