safety extra-low voltage

clause 3

Clause 3 – How to understand the definition of “protective extra-low voltage circuit”
Byforest September 7, 2024October 13, 2024

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…

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Clause 3 – How to understand the definition of “safety isolating transformer”
Byforest September 5, 2024September 7, 2024

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…

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Clause 3 – How to understand the definition of “safety extra-low voltage”
Byforest September 5, 2024September 7, 2024

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…

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Clause 3 – How to understand the definition of “class III construction”
Byforest August 26, 2024August 31, 2024

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…

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Clause 3 – How to understand the definition of “class III appliance”
Byforest August 17, 2024August 31, 2024

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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