Understanding heat load in electrical enclosures

Understanding heat load in electrical enclosures

January 12, 2026


Electrical panels
First, we need to understand the role of electrical enclosures, which is to protect sensitive electrical components from ambient contaminants, such as dust, moisture, rain, chemicals, corrosives, and other environmental factors. In today's blog, you will learn about the heat load and its potential risk.

Heat load generation
All electrical components generate waste heat as a byproduct; the amount of heat they produce relies on the energy they consume and their efficiency. The heat can be measured in Watts or BTU/hr. In electrical panels, we can find heat loads ranging from 100 Watts to over 10,000 Watts. The heat enclosed in an electrical panel can cause overheating if not evacuated using a cooling method or other technology.

How much heat is inside an electrical panel can be estimated by the number of components and the heat generated by each of them; also, the ambient temperature can add heat to the system as well, if it is exposed to the sun or near a heat-generating device, such as an oven, turbine, etc.

Heat load estimation
Another easy way to estimate internal heat load is to measure the temperature of equipment running without any cooling. The temperature is then used to calculate the heat load, taking into account the cabinet dimensions and ambient temperature.

Contact us
We provide customized solutions to meet your specific needs. Contact Noren Thermal Solutions in Troy, TX, at 512-595-5700 to learn more about Noren heat exchangers and how our team can assist you in selecting the right solution or use our calculator.
Heat Exchangers, Heat Load