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General Technical Details<br />

Protection class III luminaires provide protection against electrical shock by using Safety Extra Low<br />

Voltage (SELV). Luminaires of protection class III are not permitted to generate higher voltages than the<br />

Safety Extra Low Voltage (SELV).<br />

The following table (X1), which has been taken from the luminaire standard EN 60598-1, provides an<br />

overview of the insulation coordination between the various types of built-in electronic ballasts and the<br />

types of insulation found in luminaires.<br />

Operating gear<br />

Necessary insulation between active parts and exposed conductive parts<br />

Insulation Output voltage Protection class I Protection class II Protection class II<br />

between<br />

Insulation of Insulation of an exposed, Insulation of more than one<br />

LV supply and<br />

exposed, earthed conductive part or more exposed, conductive part<br />

the secondary<br />

and conductive as one with potential without potential equalisation<br />

circuit<br />

parts<br />

equalisation<br />

None<br />

Basic<br />

Double or<br />

reinforced<br />

UOUT > LV Supply<br />

Basic insulation Double or reinforced insulation Double or reinforced insulation<br />

suitable for U OUT suitable for UOUT suitable for UOUT<br />

UOUT ≤ L<strong>VS</strong>upply<br />

Voltage > ELV<br />

ELV (FELV)<br />

Voltage > ELV<br />

ELV (SELV)<br />

Basic insulation Double or reinforced insulation Double or reinforced insulation<br />

suitable for U OUT suitable for U OUT suitable for LV Supply<br />

Basic insulation<br />

suitable for UOUT<br />

Additional insulation<br />

suitable for<br />

UOUT plus L<strong>VS</strong>upply<br />

Insulation must satisfy the higher<br />

requirement of a) or b)<br />

a) Additional insulation suitable<br />

for UOUT plus L<strong>VS</strong>upply<br />

b) Double or reinforced<br />

insulation suitable for UOUT<br />

Basic insulation Additional insulation Additional insulation<br />

suitable for UOUT suitable for U OUT plus LV Supply suitable for U OUT plus LV Supply<br />

Basic insulation Basic insulation Double or reinforced insulation<br />

suitable for UOUT suitable for UOUT suitable for UOUT<br />

Basic insulation Basic insulation Basic insulation<br />

suitable for U OUT suitable for UOUT suitable for UOUT<br />

also see requirement of IEC 60598-1, sections 8, 10 and 11<br />

354

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