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Page 8 of 20 Text artwork 990-9030 Rev. A. Equipment Handbook for the Low Voltage Disconnectors series
SECTION 5: INSTALLATION AND COMMISSIONING
GENERAL
1 When these units are used for indirect connection to datel and data networks, private circuits, PSTN
and PBXs, the following caution must be complied with.
1.1 When connection is made to the ALARMS port, take note that these ports do not provide
insulation sufficient to meet the needs of BS EN 41003:1993. Apparatus connected to these
ports should either be approved to BS EN 41003, or have previously been evaluated against
British Telecommunications PLC (Post Office) Technical Guides 2 or 26 and given permission
to attach to British Telecommunications networks. Other usage will invalidate any approval
given to the apparatus. The ports are labelled in accordance with clause 5.2 of BS EN 41003
as follows:
'ALARMS - SAFETY WARNING See Instructions for use'
1.2 In addition, if these ports are accessible for connection to other equipment external to the host
equipment, this port must be suitably labelled. Interconnection directly or by way of other
apparatus to the ports labelled 'SAFETY WARNING See instructions for use' with a port not so
marked may produce hazardous conditions on the network and advice should be sought from a
competent engineer before such a connection is made.
VOLTAGE MONITOR SETTINGS
Note: The exact monitor settings for individual units are measured and recorded prior to despatch from
the factory, using precision voltmeters.
2 In order to avoid spurious fault reports, ensure that the following are observed when carrying out
voltage measurement tests.
2.1 Check that fuse FS2 is correctly inserted.
2.2 Wait five minutes after connection of the dc power supply to allow the monitor circuits to
stabilise.
2.3 When observing the operating voltage of a monitor setting:
2.3.1 Change the power supply voltage slowly and gradually by 0.05 V steps, pausing
between each step.
2.3.2 When a 0.05 V step results in monitor operation, record the voltage indication
immediately prior to that step; this is the monitor operating voltage. (Ignore any
change in voltmeter reading after operation.)
2.4 When recording any apparent discrepancy in the service log (Appendix A), note both the
reading observed and the voltmeter type used, together with its accuracy rating (e.g. 'Fluke
75: ± 0.14 V' or 'Fluke 77: ±0.09 V'). Note that many portable multimeters are less
accurate than might be suggested by the number of digits displayed.
PRE INSTALLATION TEST
3 If required, a pre installation test may be carried out prior to the installation and commissioning. This
is basically a re-test of the power system against the test certificate found in Appendix B. The spare
test certificate may be used to record the test results.
Note: A full pre installation test may not be possible, as specialised test equipment is required.