Wiring Accessories #42#82#14 #1
Our AFDD combines with our miniature RCBO for the highest level of protection.
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mandated AFDDs. Reduced electrical fi res.
Cutting edge Siemens technology inside.
THIS SMALL DEVICE PREVENTS ELECTRICAL FIRES WYLEX SINGLE MODULE AFDD
Arc Fault Detection Devices (AFDDs) might be new to the UK wiring regs, but that doesn’t mean they’re not of crucial importance. In a recent survey on the technology, the majority of respondents agreed that AFDDs can help to prevent electrical fi res.
Here’s everything that you need to know before your next installation.
What is an arc fault? It’s a fault in the electrical installation that produces sustained arcing (in or between conductors). This could be caused by damaged cables, defective electrical connections or faulty electrical appliances. Arc faults cause overheating and ignite fl ammable materials.
What are the benefi ts of using AFDDs?
AFDDs detect and disconnect dangerous arc faults, which would otherwise go unnoticed by older technologies, such as circuit breakers and RCDs. They fi t into consumer units or distribution boards, just like MCBs. Using AFDDs reassures you that your installation is fully compliant, (but to a higher standard than before the 18th Edition became effective).
Are AFDDs proven?
AFDDs have been tested using the same process that brought about RCDs and RCBOs. This process is robust and recognised by British, European and International electrical standards organisations. The USA, Australia and many EU countries require AFDDs to be used in certain installations and locations, which are very similar to those listed in the 18th Edition.
Do AFDDs nuisance trip?
In short, no. Each AFDD will respond to the characteristics present on the circuit the AFDD is connected to. The product standard (BS EN 62606) includes a range of tests to ensure that AFDDs will not respond to expected “operational sparking” which occurs in equipment such as vacuum cleaners, washing machines, switches &
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dimmers, switch mode power supplies and fl uorescent lamps. These are not arc faults.
Do AFDDs work on ring circuits?
Yes, AFDDs detect dangerous arcing faults on ring circuits, spurs, radials and leads whatever the mode of connection. However, if a ring circuit is broken, the ring becomes two radial circuits that are at the same electrical potential. The power fl ows both ways and there is no arc. No arc means no arc fault, which means no trip.
How do I test an AFDD?
Wylex AFDDs carry out a self-test function when initially powered up, and the AFDD repeats this self-test function regularly. They also have a test button (just like an RCD or RCBO), which you can use during the initial verifi cation or EICR. Model certifi cates now include AFDDs among the devices listed, with space for test results.
How easy is it to fi nd a fault?
The process is broadly the same as for an RCD or MCB. There are also colours on the indicator to diagnose the type of fault that has occurred.
Will I need to install a larger consumer unit?
No, a larger consumer unit is not necessary. In fact, you can sometimes use a smaller consumer unit because there is no need for RCDs.
What do the guidelines say?
The 18th Edition of the wiring regulations outlines the need to protect against the dangers of high temperatures, arcing, burning and ignition of fi re. We’ve outlined the key information you need to know.
We don’t compromise, because circuit protection saves lives.
September 2019 electrical wholesaler | 17 ●Continued over
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