Published:
29 July 2010
Category:
Q&A
Our Voltimum Experts answer your questions on a daily basis in our Technical Expertise area. This one, regarding an intruder alarm installation and whether the fused connection unit (FCU) should be switched or un-switched, is answered by the ECA:
Question: I'm providing the supply for an intruder alarm installation. Referring to Regulation 433.1, I intend to provide the supply from a fused spur connected to the origin of a ring CCT in the consumer unit, which is situated in an under-stairs cupboard.
Should the FCU be switched or un-switched? If switched, there is risk of accidental switching to 'off' position, as the control unit will be installed in the under-stairs cupboard. However, if un-switched, total isolation for maintenance cannot be achieved?
Answer: If it is a TN supply, use an un-switched FCU. If it is a TT supply, switched would be best.
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