N YEARS A
10
BG Electrical products are guaranteed against faulty materials and workmanship for a period of 10 years from date of delivery.
R
18th Edition IET Wiring Regulations
The 18th Edition Wiring Regulations (BS7671) sets out requirements for electrical installations in the UK, including requirements for protection of persons, livestock & property.
Requirements for overvoltage protection BS 7671:2018
Requirements for overvoltage protection BS 7671:2018
AFDD – Arc Fault Detection Device
An AFDD utilises electronic technology to analyse the signature (waveform) of an arc to differentiate between normal arcing and arcing faults between L-L, L-N & L-E. Upon detection of an arcing fault, the AFDD disconnects the final circuit from the supply.
A new regulation 421.1.7 has been introduced recommending the installation of arc fault detection devices to guard against the risk of fire in AC final circuits of a fixed installation, due to the effects of arc fault currents. Areas recommended include:
• Premises with sleeping accommodation • Locations at risk of fire due to materials stored e.g. barns, warehouses and workshops • Fire propagating structures • Locations with irreplaceable goods and heritage sites
AFDD Know How
In electrical circuits there are numerous cases of normal arcs appearing that correspond to a typical operation such as switches, contactors, portable tools and vacuum cleaner motors. AFDDs are designed and tested to not respond to “normal arcing” under normal operation of equipment, but to respond to “arc faults” while the equipment is in operation.
Email:
sales@bgelectrical.co.uk www.bgelectrical.uk 37
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