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I.S.10101 FAQs

Do I have to fit surge protection?


SPDs are strongly recommended for installations that are exposed to transients, to protect sensitive and expensive electrical equipment such as TVs, washing machines, PCs, alarms etc.

Clause 443.4 of I.S.10101 states;

Protection against transient overvoltages shall be provided where the consequence caused by overvoltage could:
(a) result in serious injury to, or loss of, human life;
(b) result in interruption of public services / or damage to and cultural heritage;
(c) result in interruption of commercial or industrial activity;
(d) affect a large number of co-located individuals.

For all other cases a risk assessment shall be performed to determine if protection against transient overvoltage is required.

The risk assessment method requires entering information such as the frequency of lightning in the location, and the lengths of the HV and LV supply cables, into a mathematical formula. As this type of information can be difficult to obtain, in most cases
it is more practical to fit the surge protection device.
Does it matter where in the board I fit the surge protection device?


Yes. It should be as close to the incomer as possible, with the shortest, straightest cable links between the circuit protection device and the surge protection device.
What is an Arc Fault Detection Device?


Arc fault protection devices (AFDD) use microprocessors to identify characteristic current flow and voltage curves that indicate an arc fault and automatically trip the affected circuit.
This significantly reduces the risk of fire due to faulty conductors and connections. The protective function of the AFDD has already proven its worth internationally, and has been used in Germany since February 2016.
Where do I install an AFDD?


In the consumer unit / distribution board at the origin of AC final circuits.
What are the potential hazards that AFDDs protect against?


Arc faults can be caused by all types of line faults and worn contacts;
  • Kink / break in a cable
  • Cable wear due to frequent use
  • Cable damage resulting from drilling or construction work
  • Incorrect wire stripping
  • Incorrect wire stripping
  • Incorrect bending radii
  • Loose screwed connections
  • Defective wall plugs
  • Rodents biting cables

An AFDD will trip the circuit when a potentially hazardous arc occurs, eliminating the resulting fire hazard.
How are AFDDs different to an MCB?


An AFDD is activated by both series and parallel arc faults. Unlike circuit breakers or RCDs, an AFDD does not have an electromechanical trigger, but utilises electronic technology to analyse the signature (waveform) of an arc. It reliably differentiates between an arc fault and the signature (waveform) in normal switching and control events, preventing false tripping.
More Questions?

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