Instruction manual

48
3.11 ECG Operation for
Luminaires of
Protection Classes I
and II
In accordance with EN 60598, luminaires are grouped into protection
classes according to the measures taken against contact with high
voltages.
In the case of protection class I luminaires, all accessible parts which may
become live as a result of a fault must have a good conductive connection
to the PE conductor. The conductive link between the luminaire and the
ECG must not be provided by the PE conductor of the ECG but by
appropriate mechanical design features (such as using serrated edge
washers or serrated head bolts).
In the case of protection class II luminaires, live parts must be provided
with reinforced or double insulation. Protection class II luminaires do not
therefore have an earth connection (except protection class II luminaries
with functional earth).
ECGs only approved for installation in luminaires are not assigned to a
protection class since protection classes are defined only for end products
(such as luminaires) and not for components.
All QUICKTRONIC
®
units to operate T5/∅ 16 mm-fluorescent lamps
FH
®
...HE and FQ
®
...FO are, in principle, suitable for operation in protection
class I and II, unless otherwise indicated in the latest edition of the Lighting
Programme or under www.osram.com/ecg
However, radio interference suppression and temperatures must be
checked in each case.
As a general rule, we can say that the thermal properties in open metallic
luminaires (typically protection class I luminaires) are normally better than
in enclosed plastic luminaires (typically protection class II luminaires)
because of the good thermal conductivity of metal (heat sink effect) and
better convection possibilities in the luminaire.
3.12 Insulation Distances in
Luminaires
The use of luminaires is subject of a series of regulations governing
electrical safety (shock protection) and operational reliability in wet, dusty,
corrosive, flammable and explosive conditions. European standard
EN 60598 applies to the electrical safety of luminaires.
To guarantee the electrical safety of luminaires, special attention must be
paid to clearances and tracking distances. These terms are defined as
follows in EN 60598-1-11 for the mains terminal of the luminaire:
„Tracking distances at the mains terminal shall be measured between the
active parts in the terminals an any exposed metal part. Clearance shall be
measured between the incoming mains cable and exposed metal parts (i.e.
from the bare end from which the insulation has been stripped the furthest
to the metal part that is exposed). On the side of the terminal to which the
internal wires are connected, the clearance shall be measured between the
active parts and the exposed metal parts.”
For further information please refer to luminaire standard EN 60598.
3.13 Insulation Test
Luminaires must be subjected to insulation and high voltage testing
(according to EN 60598, VDE 0711, PM 395). Proceed as follows:
• Input and output terminals of the ECG – except the PE conductor
terminal – must be connected conductively with one another.