You are correct. The NEC does not restrict the use of Type SE cable to dwellings.While Type SE cable is very commonly used in residential applications, primarily for service entrance conductors and feeders, the NEC allows it to be used in other types of occupancies as long as the installation complies with all applicable code requirements.Here's why you're right and where to find the relevant information in the NEC: NEC Article 338 (Service-Entrance Cable: Types SE and USE) This is the primary article covering SE cable. It describes the types of SE cable (SEU, SER), their construction, and uses permitted and not permitted. Critically, it doesn't limit its use to dwellings. NEC 338.10 Uses Permitted. This section states the general permitted uses for SE cable. It allows it for: Branch circuits or feeders in accordance with Article 334. Interior wiring in accordance with Article 334. NEC 334.10 Uses Permitted. This allows NM, NMC, and NMS cable to be used for both exposed and concealed work in normally dry locations (NM) or wet locations (NMC, NMS).

So, Why the Perception?

The reason you typically only see it in residential settings is likely due to a combination of factors: Cost-Effectiveness

SE cable is a relatively inexpensive wiring method, making it attractive for residential construction where budget is often a major concern.

Ease of Installation

It's relatively easy to install, especially in wood-framed construction, which is common in houses.

Suitability for Load Requirements

The typical ampacity and conductor sizes available in SE cable are often sufficient for residential loads.

Other Wiring Methods

In commercial and industrial settings, other wiring methods like EMT conduit, MC cable, or larger feeders are often preferred due to factors like:

Durability

Greater physical protection in harsh environments.

Ampacity

The need for higher current-carrying capacity.

Flexibility

Easier to make changes and additions to the electrical system.

Code Requirements

May be specifically required for certain applications or occupancies.

Important Considerations for Using SE Cable Outside of Dwellings

If you're considering using SE cable in a non-residential setting, you must carefully consider the following:

Local Amendments

Check your local electrical codes for any amendments that might restrict the use of SE cable in specific occupancies.

Environmental Conditions

Ensure the SE cable is suitable for the environment (e.g., dry location if using SEU without a moisture-resistant covering).

Physical Protection

Provide adequate physical protection for the cable if it's subject to damage. This might require running it through conduit in exposed areas.

Proper Support

Support the cable properly according to the NEC.

Ampacity and Voltage Drop

Ensure the conductor size is adequate for the load and that voltage drop is within acceptable limits.

Grounding

Properly ground the cable.

AHJ Approval: Always consult with the local Authority Having Jurisdiction (AHJ) to ensure your proposed installation meets all applicable code requirements.In conclusion, while not the typical choice for commercial or industrial applications, Type SE cable is not inherently restricted to dwelling units by the NEC. You just need to ensure compliance with all applicable code requirements and that it's suitable for the specific application. Flag for review