Surge Immunity; Touch Current - Philips Xitanium LED Xtreme SR Design-In Manual

Surge immunity

Xitanium LED Xtreme SR drivers have elevated differential-mode
and common-mode surge immunity levels which by far surpass the
requirements as defined by IEC. By design, the high immunity levels
do not only safeguard reliable driver operation in the field but also
provide high immunity for the connected LED modules, thus
enabling a high surge immunity on system level. The driver
immunity levels can be found in the driver datasheet.
In order to achieve these high immunity levels the driver EQUI
terminal must be connected to the metal parts of the luminaire and
LED module heatsink in all cases (Insulation Class I: also to earth).
Doing so will guarantee the specified surge immunity levels and will
protect the driver and LED module against surge damage. Depending
on the local conditions, additional protection against excessive high
surge voltages may be required by adding an external Surge
Protection Device in the luminaire and/or at installation level
(column/distribution cabinet).
Warning: the SR (DA+/DA-) interface and auxiliary power supply
have limited surge immunity. Therefore, it is not allowed for the
SR bus and auxiliary supply lines to leave the luminaire. Failure to
observe this may result in damage to the driver!

Touch current

Xitanium LED Xtreme SR drivers are designed to meet touch
current requirements for insulation class II applications per lighting
control gear standard IEC 61347-1 in order to enable an easy
design-in in Insulation Class II luminaires per IEC60598-1. The
specified peak values can be found in the driver datasheet and refer to
single-driver only level.
The insulation of the wiring to and from the drivers needs to be in
compliance with IEC60598. Taking into account the double
insulation of the driver between mains input and LED output, the
(supplementary) output wiring insulation rating needs to be based
on the maximum open-load voltage of the driver. See the driver
datasheet for the specific value of this voltage.
Note: In a luminaire, the cumulative touch current may be higher,
since the LED module may introduce additional touch current.
Precautions may be required on the luminaire level if multiple
drivers are used in a single luminaire. Do not leave the EQUI
terminal disconnected to lower the luminaire touch current;
impaired EMC performance and reduced surge immunity will
result.
Design-in Guide - Philips Xitanium LED Xtreme SR driver 23