Technical Design-in Guide Engine LLE G2 PRE KIT | 03-2020 | 1.2 | en
Electrical Aspects
c
25 / 63
5.1. Electrical safety
5.1.1. Basic classification of protection classes
Depending on the design of the luminaire, the requirements of different electrical protection classes are satisfied:
Luminaires in protection class III (also SELV which stands for Safety Extra Low Voltage) have such low internal voltages
that a shock current would be inconsequential. AC voltages with an effective value of up to 50 V AC and direct currents up
to 120 V DC are referred to as low voltage (also extra-low voltage and weak current).
Protection class II (non-SELV) applies for luminaires with double insulation, with no protective earth, between the mains
circuit and the output voltage or metal casing. Even if the luminaires have electrically conductive surfaces, thanks to their
insulation they are protected against contact with other live parts.
Protection class I (non-SELV) applies for luminaires with basic insulation and protective earth. All the electrically
conductive casing components are connected via a protective conductor system which is at earth potential.
5.1.2. Basic insulation of LLE G2 PRE modules
The LLE G2 PRE module features basic insulation against earth, i.e., a clearance/creepage distance greater or the same as 3 mm and
can be directly assembled on an earthed metal part of the luminaire, also in operation with LCA 50W 350-1050mA DT8 lp PRE und
LCA 100W 350-1050mA 2xDT8 lp PRE.
5.1.3. Design measures for satisfying protection class requirements
Not all the components of the LLE G2 PRE KIT system comply with the SELV standard. The voltages can thus be greater than 120 V
DC.
5.1.4. Protection class II luminaires
When using a LLE PRE module with NON-SELV level, the following measures are essential in order to achieve protection class II:
5.1.5. Protection class I luminaires
When using a LLE control gear with NON-SELV level, the following measures are essential in order to achieve protection class I:
Reinforced insulation between LLE G2 PRE module and the luminaire casing, e.g., by means of plastic casing or an additional
insulating foil between the luminaire casing and the module.
_
Reinforced insulation between the LED Driver and luminaire casing, e.g., by means of plastic casing
_
Use of double-insulated lines
_
Protect all electrical contacts against mechanical contact, this can typically be achieved with optics which cannot be removed
_
Use of metal casing for the luminaire
_
