L-INX/L-GATE User Manual
21
LOYTEC
LOYTEC electronics GmbH
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.
The same applies to 24VDC power supplies.
CAUTION
Functional Earth
Functional earth must be connected to the building’s protective earthing (PE)
system on the installation side.