Brush up on your caravan sites
Article Abstract:
A useful general rule is that the wiring of a caravan is a very specialised area and should not be attempted by a general contractor, the requirements being detailed in the 16th Edition of the Wiring Regulations. The caravan site is covered in Division Two of Section 608, the caravans themselves being dealt with in Division One. The coverage of the latter is new to the regulations. Underground cables are preferred, distances and protective covers being carefully specified to avoid piercing of cable by tent pegs and similar equipment. Overhead lines are allowed provided 3.5 meters ground clearance is given, and 6m where vehicles move.
Publication Name: Electrical Contractor
Subject: Engineering and manufacturing industries
ISSN: 0308-7174
Year: 1992
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Selecting an mcb: there is still some confusion when it comes to the corect approach for selecting miniature circuit breakers
Article Abstract:
Choosing a miniature circuit breaker (mcb) can be complicated as current ratings are not straightforward and the long standing British Standard is now a harmonised BS Euronorm. A rating shown on a circuit breaker relates to operation at 40 deg C and would be reduced at higher temperatures. External influences must be taken into account when installing equipment, particularly with the use of high temperature cables. An mcb must carry the rate current indefinitely and must disconnect in less than 100 ms when subjected to a heavy fault overload.
Publication Name: Electrical Contractor
Subject: Engineering and manufacturing industries
ISSN: 0308-7174
Year: 1995
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Voltage changes may not be harmonious
Article Abstract:
The amended British Standards 7671-1992 regulations involve voltage harmonisation. The new regulations will take effect in July 1995. Nominal voltages will be changed. The nominal voltage rating for equipment and appliances will be 230 400 V. This new rating should be used in voltage drop calculations. A voltage drop of 4% is corrrect for fixed equipment terminals.
Publication Name: Electrical Contractor
Subject: Engineering and manufacturing industries
ISSN: 0308-7174
Year: 1995
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