Wiring Accessories #67#81 #46#71 ●From previous page
Our single module AFDD is the ultimate protective device.
Retrofi t compatible AFDDs. More than just an upgrade.
3 products in a single module. Our AFDD also does the job of an MCB and an RCD.
AFDDs protect ring circuits, radial circuits, spurs and leads too.
What is an AFDD RCBO?
Wylex AFDD RCBO devices are the same size as an MCB yet they include three integral technologies: 1. MCB technology to protect against overcurrent and short circuit 2. RCD technology to protect against electric shock 3. AFDD technology to protect against arc faults that can cause fi res
This means they cater for all of the circuit protection requirements and the additional fi re protection recommendations of the 18th Edition
Can AFDDs be retrofi tted to existing installations
Yes, Wylex AFDDs can be retrofi tted in the majority of cases. However, if the Wylex balcony-style busbar is used, in some cases, the interior of the consumer unit will need to be changed.
The Wylex Single Module AFDD is half the size of its predecessor and combines the benefi ts of AFDD, MCB and RCD technology in one. Talk to a Wylex engineer before your next installation.
Chapter 13 (Fundamental Principles):
The requirements of this chapter are intended to provide for the safety of persons, livestock, and property against the dangers and damage which may arise in the reasonable use of electrical installations.
Regulations 131.1 lists several risks. The following applies: In electrical installations risk of injury may result from: • Shock currents
• Excessive temperatures likely to cause burns, fi res and other injurious effects
• Arcing or burning, likely to cause blinding effects, excessive pressure and or toxic gases
In addition, Regulations 131.3.1 states:
The electrical installation shall be so arranged that the risk of ignition of fl ammable materials due to high temperature or electric arc is minimised.
421.1.1 deals with protection against fi re caused by electrical equipment:
Persons, livestock and property shall be protected against the harmful effects of heat or fi re which may be generated or propagated in electrical installations.
NOTE 1: Harmful effects of heat or fi re may be caused by:
• Failure of electrical equipment such as protective devices, switchgear, thermostats, temperature limiters, seals of cable penetrations and wiring systems
• Overcurrent • Insulation faults or arcs, sparks and high temperature particles
18 | electrical wholesalerSeptember 2019
For full details use BS7671: 2018 IET Wiring Regulations 18th Edition.
Contact a Wylex Sales Engineer.
ewnews.co.uk 421.1.7 deals directly with AFDDs:
Arc Fault Detection Devices conforming to BS EN62606 are recommended as a means of providing additional protection against fi re caused by arc faults in AC fi nal circuits.
421.1.7 provides several examples of locations where AFDDs can be used:
• Premises with sleeping accommodation
• Premises containing fl ammable materials such as workshops
• Premises made using combustible materials such as wooden buildings
• Properties which easily propagate fi re such as high-rise buildings
• Premises containing priceless, impossible to replace goods such as museums
Important: The term ‘recommended’ means there is scope for choice whether or not to comply. If a decision is made not to follow the recommendations, that decision should be justifi ed by the user of the standard.
To fi nd out more, visit:
wylexreasons.co.uk
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