Page 17
Terminal Connections
Important Information
All terminal connection screws should be tightened to 4.5in.lbs.
(0.5Nm).
Care should be taken not to overtighten the screws.
Power
The Ultra Twin can operate from mains AC and automatically from DC or
battery backup in the event of power failure, or can be operated permanently
from DC or batteries.
Important Information
The protective earth must be connected prior to any other cabling
taking place. This is connected to terminal 3, on all wall mount
units, and should be tightened to 4.5in.lbs. (0.5Nm). In the case of
the fascia unit the earth should be connected to the stud at the rear of
the enclosure and tightened to 7.4lbF (10Nm).
The AC and DC wiring should be completed using either 16 – 14AWG
(1.5–2.5mm
2
) stranded or 16 – 14AWG (1.5–4mm
2
) solid wire.
An external supply isolator/circuit breaker (AC or DC) must be fitted near to
the unit and labelled to identify the instrument to which it refers.
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