Chapter 10, Problem 1RQ

What is the maximum temperature rating of Type XHHW insulation when used in a wet location?

To determine

To find:

The maximum temperature rating of an insulation of Type XHHW, when used in a wet location.

Answer to Problem 1RQ

The maximum temperature rating of a XHHW type insulation is 75 degrees Celsius or 167-degree Fahrenheit, when used in wet locations.

Explanation of Solution

According to National Electrical Code (NEC), the maximum temperature rating of a type XHHW insulation is ${90}^{o}C({194}^{o}F)$ when used in dry locations. But when it is used in wet locations, the maximum temperature rating falls to ${75}^{o}C({167}^{o}F)$.

Hence, we can say that the maximum temperature rating for a type XHHW insulation in wet conditions is ${75}^{o}C({167}^{o}F)$.