functional insulation as well as other insulation exists on circuit boards. Typically, the surface environment of a circuit board is determined to be either Pollution degree 3 or pollution degree 2.If the circuit board is mounted in an electrical box and sealed with a solid sealant, the sealing will look as follows: What should be…
PTC heating element: element intended for heating consisting mainly of positive temperature coefficient resistors that are thermally sensitive and have a rapid non-linear increase in resistance when the temperature is raised through a particular range. As the temperature increases, the resistance of the heating element of the PTC heating element increases. The relationship between temperature…
user maintenance: any maintenance operation stated in the instructions for use, or marked on the appliance, that the user is intended to perform. Allowed user-executed operations, the operation guideline was given in user manual, and it could be showed in enclosure of appliance. Since it is a allowed user-executed operation, then additional protective method should…
built-in appliance: fixed appliance intended to be installed in a cabinet, in a prepared recess in a wall or in a similar location. Here, because the appliance must be installed in a reserved position (usually a cubic space with only one side open), it is a fixed installation and can be regarded as a fixed…
