Digital Systems
 

Technical application guide

Insulation types

Updated and new standards for LED drivers

For OSRAM indoor LED drivers, the following insulation classes apply:

  • Non-isolated (previously “non-SELV”).
    • No isolation between input and output circuits (LED, LEDset etc.)
  • Double/reinforced-isolated
    • Voltage range:
      • SELV
      • SELV 0–60 VDC, all poles touchable, no distance requirements to touchable parts
      • SELV 60–120 VDC, one pole touchable
      • Isolating transformer > 120 VDC, no pole touchable
  • NEW
    • SELV in IEC 61347-1:2012, annex L, according to current standard IEC 61347-2-13:2014
    • Normal requirements on creepage distances and clearances, aligned with other safety standards e.g. IEC 60598-1 safety of luminaires)
  • PHASE-OUT
    • SELV in annex I according to previous standard IEC 61347-2-13:2006:
      • Very high requirements on creepage distances and clearances
      • High requirements on transformer isolation (thickness through isolation [dti]) and construction
      • Special requirements for higher level of safety, e.g. distance between input and output connector
    • SELV-equivalent according to previous standard IEC 61347-2-13:2006 IEC 60065 (safety for audio/video):
      • Normal requirements on creepage distances and clearances
      • Low requirements on transformer isolation (thickness through isolation [dti]), small constructions possible

Non-isolated drivers
Non-isolated (previously “non-SELV”) drivers have no isolation between the primary and secondary side and a basic insulation (single isolation foil) between all the electronic circuits and the driver casing. The corresponding insulation classes are similar to those of typical fluorescent ECGs.

SELV (isolated) drivers
For SELV drivers with up to 60 VDC, there are low isolation requirements for luminaire constructions because 60 VDC is touchable.

Hints for the use of non-isolated drivers in class II luminaires :

Metal luminaires of class II
LED drivers have basic insulation. LED modules should also have basic insulation. In addition, both LED driver and LED modules should be additionally isolated by supplementary insulation. All isolations should be designed according to Uout of the LED driver.

Plastic luminaires of class II
All active parts (LED modules) should be protected by at least a basic insulation if the luminaire can be opened for maintenance. The best solution is a sealed luminaire where the LED modules and the driver are not touchable with a separated connection area.