OSRAM POWERTRONIC PT-FIT I ECG for HID lamps, with cable clamp - Manual (Page 13)

THE PRODUCT IN OPERATION
2.2.4. Wiring
2.2.4.1. Wire and cabling types
When wiring luminaires in order to use high-pressure
discharge lamps, it is important to consider the U-OUT
voltage on the ECG's label. The U-OUT value gives infor-
mation on the types of wiring to be used.
OSRAM POWERTRONIC ® ECG values indicate a U-OUT
voltage of < 430 V. H05 cables for luminaire wiring (on
both the mains and the lamp side) are thus suitable.
If high temperatures are to be expected in the vicinity
of the luminaire, then cabling with silicon insulation is
re commended.
As heavy pulse loads of up to 4.5 kV occur during lamp
ignition, high-voltage capable, double insulated cable
should be used on the lamp side.
The capacity of particular types of cabling to deal with
short voltage peaks should be checked with cable manu-
facturers. For example cables marked with SiHF J 3x1.5
have been tried and tested positively for lamp side con-
nection.
It is not recommended to use simple standard or Tefl on
cables without any additional insulation protection, as
suffi cient insulation between each individual cable strand
cannot be assured over the entire service life of the lumi-
naire, thus leaving open the risk of damage to the ECG
or luminaire.
2.2.4.2. Cable cross-section
The cable cross-sections to be used are shown on the
label of the electronic control gear. In general, the follow-
ing values apply.
Solid and multi-wire cables:
Wire cross section of 0.5 mm
2 to max. 2.5 mm 2 (see tech-
nical datasheet for individual sample types)
The use of cable end sleeves is permissible but not abso-
lutely necessary. It should be noted that maximum cross
section applies to wires without cable end sleeves.
The brazing (tin plating) of cable ends has not proved suc-
cessful, as a durable stable contact between terminal and
cable cannot be guaranteed if this is done. For this reason
this method is not recommended.
Solid cables can be inserted into the terminal directly, with
fl exible cables you should use the push buttons for con-
necting and disconnecting cable strands.
Note on mains connection with fl exible connection cables
(according to EN 60598-1):
In order to ensure suffi cient mechanical stability the nomi-
nal cross section of the cable should not be less than:
• 0.75 mm
2 for ordinary luminaires
• 1 mm 2 for other luminaires
13
2.2.4.3. Cable length between ECG and lamp
The length of cables between the POWERTRONIC
® and
the lamp/luminaire is of decisive importance to:
• The ignition reliability of the system
• Conformity to the EMC limits for the relevant lighting
installation
A reliable lamp ignition must be ensured even in such un-
favorable conditions as low ambient temperature or high
humidity. Naturally, it should also be ensured for older
lamps.
A decisive factor in the allowable length of the cable is the
load capacitance of the cable being used. A load capaci-
tance of about 80 pF/m may be considered a good rule of
thumb for a standard cable. The exact values should be
obtained from the relevant cable manufacturers.
In cases where longer cabling is required, the following is
recommended:
• Use cables with particularly low capacitance
• Selecting a luminaire structure in which the wiring on
the lamp side exhibits restricted coupling capacitance
with the PE
An overview of the maximum possible load capacitance for
each ECG can be found on its technical datasheet.
Besides reliable ignition, the cable length will have a decisive
infl uence on the EMC behavior of the lighting installation.
Detailed information on this topic can be found in chapter
2.2.4.4 Wiring.