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Arc Flash Protection

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CATU Arc Flash Protection

CATU Arc Flash Protection

Thorne & Derrick Are Leading International Distributors Of Arc Flash Protection

An arc flash follows a short circuit and produces instant effects with extremely serious consequences if the correct protection is not worn. The arc flash phenomenon produces great energy release and its main manifestation is its thermal effect.

The heat energy that is released is directly proportional to the voltage, intensity and fault length and can reach extreme temperatures which can not only melt metal and cause charring to insulation but also causes serious, irreversible damage to workers.

In addition, there is also a blast effect caused by the rapid release of energy in a confined volume of air similar to an explosion. Another effect is the light effect with high levels of ultraviolet and infrared radiation being given off.

When arc flash dangers exist, heat resistant clothing must be worn.

Arc Flash Protection Selection And Application. How To Select The Correct Arc Flash Protective Clothing.

When selecting the proper arc flash equipment, it is vital to use the following points to determine exactly which product is required:

  • The maximum fault current value
  • The phase/ground rated voltage at the site of the risk
  • The distance between the source of the arc and the reception surface
  • The AC cycle number and the mono of three-phase circuit type
  • The location where the arc is produced (confined space)

Once all of these parameters have been recorded, it is possible to estimate the level of risk and determine exactly what protective clothing and PPE is required. In addition to the above factors, the protective clothing selected must be able to withstand the arc’s incident energy and the limitations of the clothing are known.

When electric are danger exists, heat resistant clothing must be worn and the arc’s characteristics are given by:

  • The resistance value of the free arc. This is expressed in cal/cmaccording to NPFA 70 E, ASTM standards and IEC 61482-1-1


  • The protection class 9 (1 or 2) with a constrained arc according to IEC 61482-1-2.

It is also vital to care for arc flash protection adequately and know how to launder the suits and workers should know how to use the equipment properly.

Video: CATU Arc Flash Kits – Protective Clothing Against Arc Flash

Arc Flash Protection For High Voltage Utility Cable Jointers & Lloyds NERS LV-HV Electrical Contractors

Arc flash protection is often used for HV utility cable jointers and electrical workers and provides often life saving protection. T&D are approved vendors to most UK DNO’s and utility networks.

CATU Arc Flash Protection For UK DNO’s And UK Utilities

CATU Arc Flash Protection For UK DNO’s And UK Utilities

For UK DNO’s typical work and installations include the design of LV HV electrical systems, cable laying at LV,11kV,33kV and 132kV, cable jointing, overhead line work and substation installation. All of which can potentially present arc flash danger.

Arc flashes can be caused in a variety of different ways ranging from just coming close to a high-amp source with a conductive object to dust or corrosion impurities coming into contact with conductor.

Other causes are breaks or gaps in insulation, equipment failure due to sub standard parts and dropping a tool that can create a spark and lead to and arc flash occurring.

CATU 40 Cal Arc Flash Protection Suit

CATU 40 Cal Arc Flash Protection Suit

Video: CATU – Arc Flash Protection Damage Test – Arc Flash Clothing PPE – 8-100cal – Nomex

Arc flash testing is vital prior to use as this demonstrates the level of protection available an that there are no faults with the kit. Arc ratings are important for companies to ensure they are compliant with regulations and keep their workforce safe from electrical incidents.

Arc flash testing is used to determine a product or material’s response to an electrical arc event by establishing an arc rating (a value attributed to materials describing their performance in an arc flash hazard).

To perform an arc flash test, a copper fuse wire is placed between two electrodes with a gap of 30 cm. This is then used to initiate an arc flash delivering both radiant and convective energy to the samples being evaluated.

The alternating current is set at a standard of 8,000 amperes and from 2-150 cycles from a 60 Hz supply.

 Industry Focus: UK Utilities – Five golden safety rules for short circuiting and earthing system

1. Separate the work area from all possible sources of power supply – This is done by opening circuit breakers, switches and locking links in the open position

2. Lock link in the open position – This is done with a safety lock system or safety padlock.

3. Check the absence of voltage – It is vital to check on at source and on site and on each conductor and any apparatus involved.

4. Apply appropriate short-circuit and earthing systems – In sufficient numbers on the conductors of your network where operation is taking place.

5. Shown, warn other and limit the work area – It is vital this precaution is taken even during the most simple maintenance operations.

Video: CATU Kit-Arc-40-B – CATU 40 Cal Arc Flash Protection Kit

 Arc Flash Protection Blogs


Q1/ What is an arc flash and what causes one?

A1/ An arc flash is a flow of current travelling through the air releasing large amounts of energy and is caused by a phase-to-phase or phase-to-ground fault.

Q2/ What’s the difference between a 1st, 2nd &amp 3rd degree burn?

A2/ A 1st degree amp burn is when only the top layer is affected, causing pain, redness and minor swelling. A 2nd degree amp burn is when blisters appear along with redness and severe pain. A 3rd degree burn is classified as the most serious type of burn where the skin is affected at all layers and dry and can appear brown, charred, white or waxy. There can be no initial pain due to nerve damage.



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