MSA GasGard XL Manuel D'utilisation page 14

3.2 Electrical Installation
CAUTION!
The control system must be installed in compliance with applicable regulations; otherwise, an unsafe
condition may exist.
During installation, use the internal earth connection to ground the instruments.
If an external earth connection is permitted or demanded by the local authorities, it serves merely as
additional earthing.
• Select an installation location that complies with the environmental conditions indicated in the tech-
nical data.
• When installing the Control Unit, the following conditions must be met to comply with the European
EMC Directive.
• A fault-free ground or fault-free potential bonding conductor must be provided when
connecting devices to the main power supply.
• Ensure an appropriate supply voltage in accordance with EMC directives.
• If the devices are supplied from a direct voltage (DC) source, the supply cable must be
shielded.
• All sensor and control cables must be shielded.
Shielded cables must have at least 80% coverage.
• Control and sensor cables must be installed physically separate from power supply cables.
• Shielded cables must be laid in a group. If cable lengths are to be extended using terminal
boxes, the boxes must be shielded and internal connections must be kept as short as possible.
• The control system can be simultaneously connected to AC voltage and 24 VDC (to enable
an automatic power switch to 24 VDC voltage if the AC main supply fails).
3.3 Power Supply
• Standard power supply 110-230 VAC/24 VDC (100 W) is used to power internal circuits and
attached sensors.
• A switch or circuit-breaker shall be included in the building installation in close proximity to the
equipment and within easy reach of the operator. It shall be marked as the disconnecting device
for the equipment.
• Main voltage is connected to terminal L (Line), N (Neutral), and ground.
Fig. 7 Connecting the Main Supply
GasGard XL
Installation
US
14