portable appliance: appliance that is intended to be moved while in operation or an appliance, other than a fixed appliance, having a mass less than 18 kg. This item is relatively easy to understand. Products that are less than 18kg are relatively light, so they are easy to move during operation, including humidifiers, fans, air…
protective extra-low voltage circuitportable appliance => portable appliance: earthed circuit operating at safety extra-low voltage which is separated from other circuits by basic insulation and protective screening, double insulation or reinforced insulationNOTE 1 Protective screening is the separation of circuits from live parts by means of an earthed screen.NOTE 2 A protective extra-low voltage circuitportable appliance => portable appliance…
safety isolating transformer: transformer, the input winding of which is electrically separated from the output winding by an insulation at least equivalent to double insulation or reinforced insulation, that is intended to supply an appliance or circuit at safety extra-low voltage The transformer mentioned here is used to supply power to appliances or circuits. Most…
safety extra-low voltage: voltage not exceeding 42 V between conductors and between conductors and earth, the no-load voltage not exceeding 50 V When safety extra-low voltage is obtained from the supply mains, it is to be through a safety isolating transformer or a convertor with separate windings, the insulation of which complies with double insulation…
extra-low voltage: voltage supplied from a source within the appliance that does not exceed 50 V between conductors and between conductors and earth when the appliance is supplied at rated voltage According to the definition of the EU Low Voltage Directive, low voltage ranges from 50-1000V for AC and 75-1500V for DC. By the way,…
creepage distance: shortest distance along the surface of insulation between two conductive parts or between a conductive part and the accessible surface. Charges can be propagated in a directional manner through the air, thus forming an current. This is the meaning of clearance. Charges can actually also propagate through the insulating material itself, because no…
clearance: shortest distance in air between two conductive parts or between a conductive part and theaccessible surface. Clearance is a very important concept. In order to understand clearance, we need to say it again that no substance is completely insulated, and air can also conduct electricity. When the voltage is very high, the current will…
class III construction: part of an appliance for which protection against electric shock relies upon safety extra-low voltage and in which voltages higher than those of safety extra-low voltage are not generated.Note basic insulation may be required in addition to supply at SELV. Refer to 8.1.4.NOTE 2 If the main part of the appliance operates…
class III appliance: appliance in which protection against electric shock relies on supply at safety extra-low voltage and in which voltages higher than those of safety extra-low voltage are not generated.NOTE basic insulation may be required in addition to supply at SELV. Refer to 8.1.4. To understand this, you need to first understand what is…
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