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ARC FLASH - THE BASICS
An Arc Flash event can expel large amounts of deadly energy.
An Arc Flash occurs during a fault, or short circuit condition, which passes through an arc gap. Temperatures can reach as high as 35,000 degrees Fahrenheit.
An arc flash can cause minor injuries, third degree burns and potential death as well as other injuries including blindness, hearing loss, nerve damage and cardiac arrest.
Fatal burns can occur when the victim is several feet from the arc.
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Arc Flash Incidents occur most often in the following industries:
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Industrial electrical environments
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Power generation
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Anyone breaking ground in electrical, gas and water, even operatives installing street lights
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Rail sector
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Petrochemicals
When?
Whilst undertaking installation, maintenance or repairs, but also when breaking ground, undertaking excavations and construction
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An Arc Flash can occur due to any of the following circumstances...
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Tools or equipment inadvertently touch live conductors or are dropped
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Faults or mistakes in isolating equipment
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Equipment failure due to faulty parts, poor installation, or even normal wear + tear
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Dust, corrosion or other impurities on conductor surfaces
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Cable strikes when breaking ground - 8 to 10 cable strikes are reported daily in the UK!
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Thorne & Derrick distribute a range of Arc Flash PPE from ProGARM.
PPE is designed to reduce the risk of life changing or life threatening 2nd or 3rd degree burns.
ProGARM PPE adheres to IEC 61482 2 : 2018 protection standards.
ProGARM garments use VXS+ inherent material, which means that the fibre will not burn – Inherent fibres create inherent yarns which are knitted or woven into inherent fabrics instant extinguishing.
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Features of ProGARM Arc Flash PPE include;
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Inherent fabric & instant extinguishing
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ThermSAFE components tested to continue to function after an incident
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Wrist tabs and neck fastening
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Reflective tape
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SafetyICON marking
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Internal labelling inc batch numbers for traceability
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Napoleon pockets for harnesses
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ProGARM Arc Flash Trousers provide Category 2 protection with 10 Cal according to IEC 61482-1-1:2009 ‘open arc’ test method – designed to be worn in conjunction with 4608 arc flash jacket.
Features & Benefits Include:
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Flame Resistant
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Combat pocket with flap – safe storage space
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Kneepad pockets – wear with kneepads for extra comfort
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ThermSAFETM plastic FR zipper – CE Certified
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Triple stitched side seams – Lifetime quality assurance
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This Arc Flash Coverall provides Category 2 protection against arc flash with 10cal/cm2 according to IEC 61482-1-1:2009 ‘open arc’ test method.
Coverall sizes ranging from S-4XL, REG LEG (31”/80cm) and M-2XL TALL LEG (33”/85cm)
Features & Benefits Include:
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Arc Flash protection and flame resistant fabric
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Gas monitor loop – secure fixing point
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SafetyICONTM on arm – visual EN Standards icon system
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The 6458 ProGARM Arc Flash Coverall provides Category 2 is specifically designed for workers in the Utility and Energy markets requiring a lighter weight fabric and a garment that can be worn in conjunction with a body harness.
Features & Benefits Include:
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Mandarin collar – maximum neck protection
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Expandable ankle opening with zippers – easy removal
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Internal elastic two-point adjustable waistband – ensures close fit
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The ProGARM 5290 Arc Flash Polo Shirt is tested to achieve Category 1 protection according to IEC 61482-1-1:2009 ‘open arc’ test method – when combined with ProGARM 5648 arc flash sweatshirt a clothing protection layer level of Category 3 is reached.
Features & Benefits Include:
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Rib knit cuffs – close fit
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ThermSAFETM plastic Flame Resistant poppers – CE Certified
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Category 1 Arc Flash Protection
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ProGARM Arc Flash Trousers provide Category 2 protection with 9.5cal/cm² according to IEC 61482-1-1:2009 ‘open arc’ test method.
Superior quality hi vis yellow combat pocket trouser with improved fit for improved comfort and appearance.
Features & Benefits Include:
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Triple stitched side seams – Lifetime quality assurance
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7cm wide reflective tape – Class 2 Hi-Visibility certification
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Category 2 Arc Flash Protection
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ProGARM Arc Flash Trousers provide Category 2 protection according to IEC 61482-1-1:2009 ‘open arc’ test method. Ideal for drivers or other wearers requiring a trouser/jacket combination – see also matching ProGARM 5808 arc flash jacket.
Features & Benefits Include:
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Category 2 Arc Flash Protection
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SafetyICONTM on leg pocket – visual EN Standards icon system
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ThermSAFETM plastic Flame Resistant zipper – CE Certified
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Arc flash polo shirt sizes range from S-4XL.
Premium long sleeved hi vis polo shirt constructed using VXS+ Pique Flame Resistant fabric with soft touch finish.
Features & Benefits Include:
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Flame Resistant and Arc Flash protection
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Enclosed stud placket – allows quick fastening
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Knitted collar with tipping – ensures best appearance after washing
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Rib knit cuffs – close fit
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ProGARM Arc Flash Trousers provide Category 2 protection with 9.5cal/cm2 according to IEC 61482-1-1:2009 ‘open arc’ test method.
The 7638 Arc flash trousers are a superior quality combat pocket trouser with improved fit for improved comfort and appearance.
Features & Benefits Inlude:
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Kneepad pockets – wear with kneepads for extra comfort
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ThermSAFETM plastic Flame Resistant zipper – CE Certified
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The ProGARM 7480 Arc Flash Coverall provides Category 2 protection against arc flash with 9.5cal/cm2 according to IEC 61482-1-1:2009 ‘open arc’ test method.
Featuring reflective tape and lightweight VXS+ Flame Resistant fabric, the coverall ensures outstanding Arc Flash protective properties.
Features & Benefits Include:
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Mandarin collar – maximum neck protection
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Gas monitor loop – secure fixing point
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The 5808 Arc Flash Jacket is ideal for drivers or other wearers requiring a trouser/jacket combination – see also matching ProGARM 5816 arc flash trousers.
Features & Benefits Include:
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Easy-Seal chest pocket flaps – no metal but secure
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Phone Pocket on sleeve with flap – safe and secure
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Easy-StretchTM side panels – maximum wear comfort
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ThermSAFETM plastic Flame Resistant zipper – CE Certified
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Thorne & Derrick supply 3M Electrical, Prysmian, Filoform and SPS low voltage cable joints suitable for connecting and jointing single and multi-core/pair power, control and instrumentation cables up to 600/1000V (3.3kV) in industrial and hazardous area
locations.
Specialist applications include fire resistant, low smoke zero halogen, hydrocarbon resistant and utility cable joints utilising Cold Shrink or Scotchcast resins.
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Cable cutting tools to suit LV-HV cables with copper or aluminium conductors, steel wire armoured (SWA) / braided cables with lead sheath and insulation types including XLPE, EPR and paper types – commonly used to cut armoured LV cables and medium/high voltage power cables 11kV-33kV, single and 3 core type.
Cable crimping tools using hydraulic or battery operated to crimp conductors 1.5sqmm-1000sqmm suit aluminium and copper conductors with sector shaped, stranded or solid cores.
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Cable jointing tools for stripping and preparing low, medium and high voltage power cables including 11kV, 33kV, 66kV and 132kV-400kV polymeric cables with XLPE or EPR insulation and bonded/peelable semi-conductive cable screens.
T&D distribute Cable Jointing Tools from leading manufacturers including Alroc, Ripley, Boddingtons and Hivotec for all types of LV, MV or HV cable stripping, preparation and jointing requirements – insulated tools are available for live-working on low voltage cables, joints and electrical equipment up to 1,000v.
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Cable protection covers, tile tapes and underground warning tapes are installed over LV, MV and HV power cables in trench and ducted cable installations with high visibility colour providing a visual warning of danger when excavating cables.
11kV and 33kV cable protection tapes (Tapetile and Stokbord covers) are manufactured from heavy duty plastic for reliable protection.
Underground protective covers are used to provide a clear and effective visual warning to the presence of LV-HV underground cables, cable duct or high voltage cable joints.
BLOG : Tape Tile & Stokbord Cable Protection Covers For MV HV Power Cables
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Cable Transits manufactured by Roxtec to provide effective sealing of single and multiple low and high voltage cables and ducts against constant water pressure, fire spread and gas migration.
Extensively specified in the Utility Power, Transmission & Distribution sectors for sealing cable ducts and protecting 11kV/33kV medium/high voltage substations against flood risk.
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T&D supply both standard and bespoke feeder pillars in a selection of materials, paint finishes and dimensions to meet all indoor and exterior power distribution, control and lighting requirements up to 1,000 volts with IP65 door seal – this includes LV substation and network pillars with DNO supply cut-outs for utility applications.
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In this BLOG we discuss to processes and Furse products used for the Earthing of electricity substations with site installation photographs from an EHV 275kV substation earthing project.
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BASEC are collaborating on knowledge and content sharing with Thorne & Derrick.
With a shared passion and ambition to enhance LV MV HV electrical safety by the education of industry stakeholders to specify and buy accredited, tested and certified Quality Cables & Cable Accessories.
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The following article has been republished with kind permission of Martha Davis (Senior Director of Content – T&D World and Utility Analytics Institute) from Transmission & Distribution World and their video sponsor Burns & McDonnell.
The 5 Videos videos are real-life and shot-on-site, showing transmission and distribution crews and splicers at work.
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