OSRAM HALOTRONIC-PROFESSIONAL HTL - Manual (Page 17)

6
5.1 Maximum 12 V The length of 2 V cables must be less than 2 m to comply with radio
cable length interference limit values. This means that luminaires can be installed
within a radius of 2 m around the electronic transformer. There is no
advantage in terms of radio interference suppression in using shielded
cables for the secondary line since both secondary poles carry high
frequency, which makes shielding impossible.
Note also that long secondary cable lengths (more than 2 m) and/or
non-parallel or twisted wires (large loops) produce a large inductance
for the electronic transformer. Because of the associated loss of vol-
tage on the cables, this leads to a low lamp voltage. The lamps may
flicker, the short-circuit protection circuit in the transformer may fail to
respond or, in extreme cases, the unit may fail altogether.
5. Notes on independent installation
and installation in luminaires