Yes, PVC is permitted for use in elevator work.
According to the provided reference, PVC is permitted in elevator work. While it is allowed, it is often considered problematic by professionals who may prefer alternatives like Electrical Metallic Tubing (EMT), even though PVC is typically less expensive.
Key Considerations for Electrical Conduit in Elevator Shafts
Choosing the right conduit for an elevator shaft is crucial for safety, durability, and compliance with electrical codes. While PVC is technically permissible, there are practical aspects to consider:
- Permitted Material: As stated in the reference, PVC is permitted in elevator work. This means its use aligns with certain electrical installation standards for these environments.
- Professional Preference: Despite being allowed, the reference notes that PVC is problematic for several reasons, and most professionals prefer EMT. The specific reasons aren't detailed in the reference, but common issues with PVC in such applications can include potential issues with smoke and fire resistance compared to metal conduits, and structural rigidity over long vertical runs.
- Cost Comparison: PVC is generally less expensive than EMT, which might make it an attractive option from a cost perspective. However, the preference for EMT suggests that other factors, such as ease of installation, durability, or code interpretations, often outweigh the cost savings.
- Prohibited Materials: It's important to note that certain materials are strictly prohibited. For instance, the reference mentions that Nonmetallic-sheathed cable (Type NM, trade name Romex) is prohibited in most non-dwellings and not used in elevator work. This highlights that specific, stringent rules apply to elevator shaft wiring.
Summary Table: Conduit Types in Elevator Shafts
| Conduit Type | Status in Elevator Work | Professional Preference | Cost | Notes |
|---|---|---|---|---|
| PVC | Permitted | Generally Less Preferred | Lower | Problematic for several reasons |
| EMT | Preferred | Generally Preferred | Higher | Often chosen over PVC by professionals |
| Type NM | Prohibited | N/A | N/A | Not permitted in elevator work |
In conclusion, while PVC is listed as a permitted material for elevator work according to the provided information, it's essential to understand that it comes with noted problems and is often not the preferred choice among electrical professionals who frequently opt for alternatives like EMT.
