Ac Mains Input; Backup Dc Power Supply Input - Bosch LA3-VARI-B Installation Manual

24 en | Connector and wiring details
5.1

AC Mains input (1)

The VARI base unit is equipped with a 3‑pin IEC AC mains connector. The power supply
assembly has an internal mains fuse and is not user-accessible. Mains fuse replacement
should only be performed by qualified personnel. For ease of installation, the VARI base unit is
delivered with a rewireable angled IEC mains power cable connector. Only this connector may
be used and should be fitted to a power cord of the required length, having a wire size of 3 x
1 mm sq. (18 AWG). The power cord should be compliant to the applicable national electrical
installation regulations and directives.
Warning!
Only qualified service personnel is allowed to assemble the mains connection.
The VARI base units are Class 1 devices. These units have their chassis connected to the
earth pin of the IEC mains connector. This pin must be connected to the electrical earth/
ground. A fault in the VARI unit which causes a live conductor to contact the casing will cause
!
a current to flow in the earth conductor. This current should trip either an externally installed
overcurrent device (fuse or circuit breaker) or a residual current circuit breaker (ground fault
circuit interrupter) which will cut off the supply of electricity to the appliance. Because the
IEC mains connector of the VARI base unit is not readily accessible to disconnect the unit
when necessary, the mains connection to the VARI base unit should incorporate a manual
circuitbreaker or an accessible mains plug.
Wire the connecter as shown in the table:
Term
L
N
E
Please use the two supplied cable ties as a strain relief.
First, secure one cable tie around the cable itself. Secondly, secure the cable to the tie mount
with the second cable tie, so that the first tie is at the side of the connector.
Now lateral movement is restricted so that no strain can be placed on the connector.
5.2

Backup DC power supply input (2)

Connector type: 2‑pole, 7.62 mm-pitch:
Pin
1
2
Warning!
Because the DC power supply current can be quite high, a minimum wire size of 2.5 mm2, or
!
AWG12 must be used.
2018.06 | V1.3 |
Europe USA
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Bosch Security Systems B.V.