LIP-ME20X User Manual
11
LOYTEC
Version 7.2
LOYTEC electronics GmbH
CAUTION
IEC (SELV, PELV) (world-wide)
Depending on the extra-low voltage earthing (24VAC), this results in an
application according to SELV or PELV in accordance with IEC 60364-4-
41:
Ungrounded = SELV (Safety Extra Low Voltage),
Earth ground = PELV (Protected Extra Low Voltage).
CAUTION
NEC (North America)
Class 2 transformers with energy limitation to 100 VA or Class 2 circuits
with max. 100 VA (using a non-energy-limiting transformer of max.
400VA) combined with overcurrent limits (T-4A fuses) can be used for
each individual 24VAC device. Several fuses for several isolated secondary
circuits per transformer are possible. The same applies to power supplies
with 24VDC.
CAUTION
Device Safety
Device safety is guaranteed by supply with low voltage 24VAC or 24VDC
and a double insulation between mains voltage 230VAC, 24VAC circuits
and the housing or by supply via Power over Ethernet (PoE Class 1). In
addition, the specific regulations for electrical wiring according to this
manual must be observed.
CAUTION
Earth Ground of (System Zero AC/DC 24V)
The following items must be observed when earth-grounding system zero
24VAC:
In principle, both earth-grounding and non-grounding of system zero
of the operating voltage 24VAC is permitted. Important are the local
regulations and customs. Due to functional requirements, earth
ground may be necessary or inadmissible.
It is recommended to ground 24VAC systems unless this contradicts
the manufacturer’s instructions.
To avoid earth loops, systems with PELV may only be connected to
earth ground at one point in the system. Unless otherwise stated,
usually at the transformer.