The disconnect rating for heating equipment must be not less than what percentage of the total load?

The disconnect rating for heating equipment must be not less than what percentage of the total load?

• A. 100%
• B. 110%
• C. 125%
• D. 150%

Answer: (C)

Heating equipment is treated as a continuous load, so the disconnecting means must be rated for at least 125% of the total connected load. This 1.25 multiplier provides a margin to handle prolonged operation and any inrush or startup current without overheating the disconnect or tripping unnecessarily. So the minimum required rating is 125% of the total load. Using 100% or 110% would be too small for a continuous load, while 150% would be acceptable but unnecessary since 125% is the code’s required minimum.

Heating equipment is treated as a continuous load, so the disconnecting means must be rated for at least 125% of the total connected load. This 1.25 multiplier provides a margin to handle prolonged operation and any inrush or startup current without overheating the disconnect or tripping unnecessarily. So the minimum required rating is 125% of the total load. Using 100% or 110% would be too small for a continuous load, while 150% would be acceptable but unnecessary since 125% is the code’s required minimum.