Which of the following conductor installations are in locations that are considered to be wet?

• A. Open conductors on insulators between a pole mounted transformer and a building.
• B. Conductor installed in PVC Schedule 40 conduit underground.
• C. Conductor installed in surface-mounted conduit inside a car wash.
• D. All of these

Answer: (D)

Wet locations are areas where moisture or water can be present, so conductors there must be rated and installed for wet conditions. In this question, every scenario puts conductors in a moisture-prone environment: open conductors exposed outdoors between a pole-mounted transformer and a building are directly subjected to rain, dew, and humidity; underground conduit, even if it’s PVC Schedule 40, can still harbor moisture inside and in surrounding soil, creating a damp or wet environment; and a conduit that’s surface-mounted inside a car wash faces frequent water spray and high humidity. Because each location can experience moisture, all of these are considered wet locations, making all of them acceptable only if the conductors and fittings are rated for wet locations.