Guide to the Wiring Regulations
or vehicle traffic), and armoured cables or other protection should be used where there is expected to be any risk of damage. It is desirable that switchgear and control gear is not accessible to the general public and should be enclosed in lockable cabinets or similar. Most exhibition halls and shows have specific licensing and inspection requirements or rules for exhibitors, e.g. the Amusement Devices Inspection Procedures Scheme (ADIPS). This was introduced by the industry with HSE support, and provides for third party safety inspections for entertainment and amusement devices and rides. Current approval documentation from such an inspection may need to be shown to the organizers, along with electrical installation and electrical equipment inspection and testing certification.
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Solar photovoltaic (PV) power supply systems (712)
G 7.1
Introduction, principles and terminology BS 7671 includes Section 712, which, to give it its full title, is ‘Solar Photovoltaic (PV) Power Supply Systems’. The purpose for inclusion of this new section in BS 7671 is only concerned with safety. In this section of the book, terms used to describe the subject are PV cells (individual cells), PV strings (a circuit arrangement of PV cells), PV arrays (a general term for a collection of cells, possibly comprising a number of PV strings) and PV system (the cells or arrays, their control and connection); the terms are generally expanded upon and illustrated in this section. A PV system is a collection of interconnected PV cells that turn sunlight directly into electrical energy, and consequently needs to be installed outside (usually at roof level); so any external electrical work has to be suitable for the environment and correctly IP rated. PV arrays and equipment must conform with the relevant equipment Standards, i.e. BS EN 61215. PV arrays are just one of several sources of sustainable energy (e.g. wind turbines), and all have similar connection requirements to run in parallel with the Regional Electricity Companies’ mains supply. The Department of Trade and Industry (DTI) has published a guidance document on the installation and connection of such sources (Photovoltaics in Buildings, 2nd Edition printed 2006 {URN 06/1972}), and this provides detailed information on installation requirements.
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