What additional component must be included with Type TC-ER cable used in a Class III, Division 1 location?

In a Class III, Division 1 location, Type TC-ER (Tray Cable – Exposed Run) cable must include a drain wire as an additional component. This requirement is important because the drain wire serves as a means for grounding and provides a path for electrical faults, thereby enhancing safety in environments where combustible dust is present.

The presence of a drain wire helps to prevent static electricity build-up, which could lead to ignition of any hazardous materials in the surrounding area. In locations classified as Class III, there is a higher risk of dust accumulation that can ignite under certain conditions. Therefore, the drain wire is essential for ensuring that the cable remains compliant with electrical codes and safety standards specific to hazardous locations.

While other types of cables may have different requirements or features, the drain wire specifically enhances the performance and safety of Type TC-ER cables in these environments, making it a critical addition in Class III, Division 1 areas.