A permitted wiring method for direct-current turbine output circuits installed inside a building from where it enters the building to the first disconnecting means includes.

A permitted wiring method for direct-current turbine output circuits installed inside a building from where it enters the building to the first disconnecting means includes.

• A. Electrical Nonmetallic Tubing
• B. High-Density Polyethylene
• C. Liquid-tight Flexible Nonmetallic Conduit
• D. Intermediate Metal Conduit

Answer: (D)

When a direct-current wind-turbine output circuit runs inside a building from where it enters to the first disconnecting means, it needs a protective raceway that provides solid mechanical protection and a continuous conductive path. Intermediate metal conduit fits that need well. It’s a rigid metal raceway designed for interior wiring and exposed locations, offering robust protection against physical damage and aiding proper termination and grounding continuity up to the disconnect. Other options don’t meet this requirement as reliably. Electrical Nonmetallic Tubing is nonmetallic and aimed at dry interior locations, but may not provide the same level of mechanical protection or fire-related considerations for a turbine output circuit. High-Density Polyethylene is used primarily for underground or outdoor paths, not interior building wiring. Liquid-tight Flexible Nonmetallic Conduit is flexible and less protected for a long interior run to the disconnect, making it unsuitable for this application. Thus, Intermediate Metal Conduit is the appropriate choice for wiring the turbine’s DC output inside a building up to the first disconnect.

When a direct-current wind-turbine output circuit runs inside a building from where it enters to the first disconnecting means, it needs a protective raceway that provides solid mechanical protection and a continuous conductive path. Intermediate metal conduit fits that need well. It’s a rigid metal raceway designed for interior wiring and exposed locations, offering robust protection against physical damage and aiding proper termination and grounding continuity up to the disconnect.

Other options don’t meet this requirement as reliably. Electrical Nonmetallic Tubing is nonmetallic and aimed at dry interior locations, but may not provide the same level of mechanical protection or fire-related considerations for a turbine output circuit. High-Density Polyethylene is used primarily for underground or outdoor paths, not interior building wiring. Liquid-tight Flexible Nonmetallic Conduit is flexible and less protected for a long interior run to the disconnect, making it unsuitable for this application.

Thus, Intermediate Metal Conduit is the appropriate choice for wiring the turbine’s DC output inside a building up to the first disconnect.