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The insulation of each conductor must be prepared and connected such that no part
of the bare conductor is visible or protruding outside the terminal block, and in the
case of standard conductors, that all the strands are twisted together and firmly clamped
in the terminal. Each of the wires must be cut to a length such that, if the cable slips
out of the cable clamp and is strained, the live conductor will become taut before the
conductor that is connected to the protective earth terminal. The outer covering insu-
lation must be clamped under the cable clamp provided. It is important that this
cable enters the cabinet through the hole provided, is not looped within the control,
and does not run close to other system cables inside or external to the control.
The cover of the cabinet must not be opened before isolating the mains supply. A
green LED on the main PCB indicates the presence of AC mains supply. The cover
must be securely fastened in normal use.
Cable Type
The conductors of the mains supply cable must be of a minimum cross-sectional
area of 0.75mm, and the insulating material on each conductor must be a minimum
of 0.4mm thick polyvinyl chloride (PVC). Flexible cables must conform to the
requirements of IEC Publication 227. Non-flexible electrical installation cables must
conform to BS6004 and the earth continuity conductor must be covered with a green-
and-yellow sleeve where it leaves the outer sheath.
Fuses
The mains fuse in the fuseholder within the cabinet is rated at 2 amps.
The mains supply must be disconnected before opening the cabinet and changing
the fuse. Replace this fuse with the same type and rating, i.e.:
Rating:
Construction: Ceramic cartridge, sand filled
Dimensions: 1 inch lengt 0.25 inch diameter.
Conformance: BS 1362.
Equipment Rating
The control equipment is designed to operate on a mains supply of 240 volts AC at
a frequency of 50Hz. It is not suitable for other types of supply. The maximum
current consumption in normal use is 100mA.
Batteries
The battery used in the control must be a 12-volt sealed lead-acid rechargeable bat-
tery of up to 6 ampere-hour capacity.
The battery must be positioned on the battery shelf in an upright position with the
terminals at the top.
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