Clause 3 – How to understand the definition of “rated power input”

rated power input:
power input assigned to the appliance by the manufacturer
Note 1 to entry: If no power input is assigned to the appliance, the rated power input for heating appliances and combined appliances is the power input measured when the appliance is supplied at rated voltage and operated under normal operation.

In general, the manufacturer may base the rated power input on the input power produced by a product operating at its rated voltage under conditions of maximum power input. This is because the power input test in clause10 requires the product to operate at the rated voltage. Some products may have special cases, which will be mentioned in subsequent chapters.

For experienced development teams, the rated power input is determined at the early stage of product design, and the developers will design the product according to the design program. There are also some cases that the developers do not have a design scheme, and then temporarily confirm the rated power input after the product prototype is produced. Such as a room heater (quartz tube heater) product’s rated voltage is AC220V, then usually, you can let the product to AC220V power supply, the heater’s operating state is set to the highest level of heat (if there is a swing or other functions, you also need to turn on), which records the actual input power, the value of rounding, as the rated power input. Therefore, when performing the power input test in clause 10, the test value and the rated value exceed the deviation range specified in the standard, the rated power input can be changed to comply with the requirements of clause 10.

In most cases, the appliance is given a rated powerinput. Sometimes, the product is only given a rated input current, but during actual testing, standards require that the product’s operating condition be determined based on the rated input power. It is then possible to determine the input power information according to the information in this note. This is a rare situation. If a product’s test conditions are to be based on rated input power, the product is usually labeled with the rated input power. Even if the manufacturer of the product does not give an input power rating, a third party testing lab will usually request the input power rating information when testing the product.
Here’s a hypothetical example of a quartz tube room heater that is labeled with a rated voltage of AC220V and a rated current input of 10A, with no rated power input. When conducting the heat test in clause 11, the standard requires the product to operate at 1.15 times the rated input power. At this situation, the rated power input can be determined by using the information in the notes to this article.
Heating appliances are usually mark a rated power input.