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ProGARM 4690 Coveralls | Arc Flash Protection for Rail Trackside & Substation Engineers
January 2nd, 2024
ProGARM | 4690 Coveralls
Progarm 4690
RIS-3279-tom tested arc flash cOVERALLS
ProGARM’S Mission is to Lead with Innovation
Introducing a new addition to the ProGARM range of Arc Flash Clothing – the ProGARM 4690 is a lightweight and comfortable high vis orange coveralls Tested to RIS 3279 Standard to protect workers in the rail industry.
These arc flash coveralls feature the improved lighter and more comfortable fabric.
Features and Benefits of ProGARM 4690 Coveralls
- Arc flash protection and flame resistant fabric
- Mandarin collar // Maximum neck protection
- Kneepad pockets // Wear with kneepacks for extra comfort
- Chest Pockets with zippers // Secure storage
- Gas monitor loop // Secure fixing point
- SafetyICON on arm // Visual EN Standards icon system
- 5cm FR AS Reflective Tape // Double Stitched for longer life
- Phone Pocket on sleeve with flap // Safe and Secure
- Cuff tabs with VELCRO Brand fasteners // Close fit around wrist or gloves
- Side access pockets with flaps // With entry inside coverall
- ThermSAFE plastic FR zippers // CE Certified
- Internal elastic 2 Point adjustable waistband // Ensures close fit
- Double stitched side seams // Lifetime quality assurance
- Easy-Stretch side panels // Maximum wear comfort

RIS-3279-TOM Tested Arc Flash Coveralls (Hi-Vis Orange) | ProGARM 4690
Arc Flash Coveralls 4690
SPECIFICATION
- Sizes: Small Regular leg, Medium Regular leg, Medium Tall leg, Large Regular leg, Large Tall leg, XLarge Regular leg, XLarge Tall leg, 2XLarge Regular leg, 2XLarge Tall leg, 3XLarge Regular leg, 4XLarge Regular leg
- Colour: HI-Viz Orange
- Open ARC Test: ARC 2
- Box Test: 4KA // Class 1
- LOI: Not applicable
- Protection Type: Antistatic // ARC Flash // Heat & Flame // Hi-visibility // Railway
- Fabric: ProGARM VXS + inherent Woven weave // 290
- Industry Sector: Industrial Electrical // Petrochemical // Rail // Utilities & Power protection
- Type: ARC Flash Coveralls
- Collection: Hi-Visibility Orange Collection
Arc Flash Clothing EN STANDARDS
ProGARM 4690 arc flash coveralls are garment Tested to the following European Standards;
- EN 1149-5:2018: Pt. 5:2008 // Pt.3:2004 // Charge DecayÂ
- EN ISO 11611:2015:Class 1 // A1
- EN ISO 11612:2015: A1 // B1 // C1 // F1Â
- EN ISO 20471: 2013: Class 3Â
- IEC 61482-2:2018: APC 1 // ATPV=8 cal/cm² // ARC 2Â
- RIS 3279 : Issue 1

ProGARM for the Rail Industry | RIS-3279-TOM
What is RIS-3279-TOM?
RIS-3279-TOM (formerly known as GO-RT 3279) is a high visibility standard that only applies to the rail industry in the UK, as opposed to the EU-Wide nature of other EN standards. The aim is to ensure that rail workers on or near the trackside are sufficiently visible to trains approaching at speed or any other traffic.
High visibility clothing is the fundamental principle behind the UK Rail Industry Standard. This is based on the European Norm EN 20471:2013, and garments must comply to Class 2 High Visibility, the middle of a three class range. The standard states the following: ‘high visibility clothing worn by people on the lineside or on or near the line should conform to a single standard for the colour and luminance of background material and that this standard will accord with the detail contained within BS EN 20471:2013 high visibility clothing – Test methods and requirements (ISO 20471:2013).’
cOLOUR rEQUIREMENT sTANDARDS
However It is stated in the standard that: ‘the colour specific requirements within this standard conform to the range specified within BS EN 20471 clause 5.1.2.’ In order to confine this to a specific orange colour, and to prevent the selection of a colour at the red end of the spectrum, the precise chromaticity co-ordinates for the colour are specified as: Fluorescent orange, X:0.588, Y:0.371. with a luminance factor of at least 0.4. The accepted tolerance in colour is as laid out in EN 20471. However, there is no tolerance for the luminance factor.
Also stipulated in RIS-3279-TOM is the need of retro-reflective materials, with photometric and physical performance aligned with EN 20471.

ARC Flash Coverall Range
Mentioned in RIS-3279-TOM is the accepted use of a mini vest where the nature of the work being carried out will not obscure the high visibility clothing, and thus reduce the surface area’ that is visible. The same applies to company logos; these are permitted where they do not compromise the surface area of background colour, and compensation may have to be made for this.
ProGARM 4690 Arc Flash Coveralls
Arc Flash Coveralls, from the ProGARM range of Arc Rated garments and clothing are used to protect against arc flash accidents as the last line of defence. Arc Flash PPE will not prevent incidents, and it is therefore vital that a comprehensive electrical safety plan for maintenance, repair and diagnostic procedures (involving energised LV, MV or HV electrical equipment) is also implemented.
Thorne & Derrick distribute a range of arc flash coveralls to suit a range of requirements. Variations include ladies coveralls, designs for overhead linesmen, orange and yellow hi vis options and a wide range of sizes. Contact Thorne & Derrick with your specific PPE requirements and we will be happy to help.
The ProGARM range of Flame Resistant protective garments are designed for every-day wear and protection – the highly breathable clothing ranges are designed for comfort and safety without compromising the ability of the wearer to work productively, safely and unhampered by cumbersome garments prone to overheating.
Other garments and protection products include Arc Flash Gloves, Arc Clothing, Arc Flash Suits and Arc Flash Helmets & Visors.
💡 Did you know? – While high voltage equipment does increase the likelihood and intensity of arc flash explosions, they can occur in any live electrical environment – even low voltage.
Further Reading
Arc Flash Learning & Resources

Thorne and Derrick are proud to be distributors of ProGARM arc flash coveralls and protection.
We can help – should you require arc flash calculators or advice on the type of clothing and protection available please do not hesitate to contact us.

Arc Flash Protection Covers for Worker Protection Against Underground Cable Strikes
January 2nd, 2024
Arc Flash Covers | Protection Against Underground Strikes
2800 Arc Flash Protection
The ProGARM range of protective garments deliver ultimate Arc Flash clothing and protection, conforming with the relevant industry and EN standards ensuring protection from Arc Flash incidents.
The Range of ProGARM 2800 are specially engineered to provide an extra protective layer against the risk of underground cable strikes, whilst at the same time providing an important visual hazard warning for those in the vicinity.

When to use the Arc Flash Covers
The Arc Cover is used as a warning not to dig near a cable and helping prevent the cable being hit, they provide you with additional protection against the risk of underground service strikes during the core activities you carry out on a daily basis.
- When digging near a cable and it is not exposed
- Once a cable is exposed but not damaged to the side of an excavation
- When digging near an exposed cable
- To support the handover for awareness of an exposed cable or when in excavation is in close proximity to a cable

Arc Flash Covers – Features and Benefits
- Two Layer Construction featuring paddingÂ
- 50cm FR industrial wash reflective tapeÂ
- FR studs for attaching multiple coversÂ
- Includes anchor point to hold cover in place
- Water resistance fabric layerÂ
- Machine Washable
- Size: 68.5cm x 50cm

Arc Flash Protection – EN Standards

Polo Shirts | Jackets | Coveralls | Trousers | Sweatshirts
Arc Flash Learning & Resources

Thorne and Derrick are proud to be distributors of ProGARM arc flash coveralls and protection.
We can help – should you require arc flash calculators or advice on the type of clothing and protection available please do not hesitate to contact us.

Further Reading
- IEC 61482-2 2018 – Get Up To Speed With The New Arc Flash Standard
- Arc Flash Clothing – PPE To Protect Highways, Street Lighting & Utility Contractors
- Arc Gloves | New Arc Flash Dexterity Gloves from Protection Specialists ProGARM
- New Arc Flash Coveralls from Protection Specialists ProGARM
- IEC 61482-2 | Arc Flash Protective Clothing Standards
THORNE & DERRICK
Thorne & Derrick are national distributors of LV, MV & HV Cable Installation, Jointing, Substation & Electrical Equipment – servicing businesses involved in cabling, jointing, substation, earthing, overhead line and electrical construction at LV, 11kV, 33kV, 66kV and EHV. Supplying a complete range of power cable accessories to support the installation and maintenance of low/medium and high voltage power systems:
- Slip-on Cable Terminations
- Cold-shrink Cable Terminations
- Heat-shrink Cable Terminations
- Cable Joints – Heat & Cold-shrink
- Separable Connectors (Euromold)
- Surge Arresters & Switchgear/Transformer Bushings
Key Product Categories: Duct Seals | Cable Cleats | Cable Glands | Electrical Safety | Arc Flash Protection | Cable Jointing Tools | Cable Pulling | Earthing | Feeder Pillars | Cable Joints LV | Joints & Terminations MVÂ
Filoform MD5 Duct Sealing System Vs DIY Expanding Foam
January 2nd, 2024Filoform MD5 Sealing System
vs DIY Expanding Foam
Most UK utilities have banned the use of expanding foam as a measure to effectively seal cable ducts against water ingress, gas migration or fire spread. Failure to correctly and safely seal cable ducts can inflict catastrophic damage to LV MV HV Electrical Distribution Networks, Substations and Power Supply.
Thorne & Derrick International are the UK distributors for Filoform, a leading manufacturer of cable joints, duct seals and special resins for installation in the utilities, telecom, traffic, rail, fibre optic, street lighting and construction industries.
Polyurethane foam (PU) has witnessed a increase in popularity as a construction material due to its versatility. PU can be applied to walls, roofs, ceilings, floors providing insulation and structural support. Technological advancements have overcome engineering challenges, allowing for low-density foam products that are easy to install on-site.

Duct Seals – Sealing Cable Ducts
uSING Filoform MD5 Duct Sealing VS DIY expanding foAM
Whilst expanding foam serves well for sealing small gaps, filling voids, cracks and insulating it falls short beyond these applications. Often comprised of subpar polyurethane, many expanding foams lack the necessary properties for effective sealing or adhesion.
The use of expanding foam in construction and maintenance projects across various industries have grown over time; however it faces major problems when applied wrong, or designed into a project where the foam specifications doesn’t match the requirements of the projects.
Comparing MD5 Duct Sealing Resin to Generic expanding foam
Assessing the particular duct seal scenario and determining the project’s goals are important when selecting an efficient seal. Taking into account elements such as :
- Cable PresenceÂ
- Water blocking specifications
- Fire Stop standards
- Building entrance pointsÂ
- Gas and chemical problems
During the design phase choosing a sealing system that fits the needs of the entire project should be made easier by taking the circumstances into consideration.
Sealing Ducts require precision, a professional would strongly advise against using DIY expanding foam for this purpose due to potential complications. For guidance in your inquiries please contact us today!Â
| Properties | Generic expanding foam – DIY stores | MD5 Duct Sealing Resin – Two Components |
| Cell Structure | Large, Weak, soft foam – 70% closed | 100% closed, small, strong, durable |
| Expansion Rate | 35 x can volume – Very quick & controlled | 8 x volume – Slow & easy to control |
| Temperature Resistance | +194°F / +90°F | +248°F / +120°F |
| Compressive Strength | 3 Newton / cm² / 0.67 pounds of force | 60 Newtons / 14 pounds of force |
| Resistance to Hydrocarbons | No | Yes |
| Water Resistant | Yes – temporarily | Yes permanently – upto 1.5 bar / psi |

MD5 Sealing System vs DIY Expanding Foam | FILOFORM
hOW TO SELECT A DUCT SEAL SOLUTION
It is important to evaluate specific duct sealing situation and identify the objectives of the seal. For example:
- Is there cables in the duct and how many?
- Does water need to be blocked? How much water?
- Is a firestop needed?
- Does the conduit enter the building?
- Are gases or chemicals a concern?
This process should take place during the design phase aligning the seal requirements with the overall product specifications. Generally, a design specification will encompass gas, water and fire resistance along with specified chemical resistance. However any reputable seal manufacturer should be able to furnish evidence regarding the expected lifespan.
Key to an effective seal
- Training and preparation – read and follow manufacturers instructions. This requires knowledge and skill.
- Sealing system selection – most underground duct sealing systems will need to block water and gases and tolerate hydrocarbons. If the duct enters the building, a fire stop may be required so you need to select a sealing system that addresses the risk present.
- Cable separation – this is a area where most duct seals will fail ; either the product doesn’t support cable separation, or the installer has been unable to separate the cable sufficiently. Without separation, water and gases will simply wick through areas without the sealant.
- Conduit sealing – our range of conduit sealing systems have been designed to provide a simple and effective solution for watertight and gas sealing of pipes and cables in conduits, boreholes and ducts. Conduit sealing systems can be installed horizontally and vertically; they are very flexible.
Key Benefits of using an effective Duct seal
- Allows for low density foam to use
- Used in many places .
- Made of good quality polyurethane foam material

Duct sealing and sealing products manufactured by Filoform are installed to provide gas tight and watertight sealing for cable duct entries – protecting underground cables and substation ducting infrastructure against flood and migration of flammable and toxic gas hazards. Fire resistant version also available – suitable for sealing LV-HV power, telecoms and fibre optic cables.
Filoform manufacture and supply quality products and solutions to connect, seal and protect low, medium and high voltage underground cable networks.

Thorne & Derrick provide competitive prices and fast delivery from stock for the complete range of Filoform duct seals and cable joints.
View the complete range of Filoform products.

FiloSeal+HD Duct Sealing System
EV Insulated Matting | Enhancing Safety in the Workplace | LV MV HV
January 2nd, 2024
Mitigating Risks | High Voltage Systems | CATU
EV Insulated Mats
Protecting against accidents in LV MV HV Systems
CATU’s electrical insulating matting provide electrical safety protection for individual and collective protection for workers involved on LV MV HV installations for voltages of 3.3kV, 6.6kV, 11kV, 15kV, 20kV and 33kV – generally used in conjunction with additional PPE such as insulating gloves for worker safety.
Insulated Mats, manufactured by CATU Electrical Safety and distributed by Thorne & Derrick, made from elastomer are used to cover ground for electrical protection of operators during work or interventions on electrical installations.
By incorporating insulated matting into safety protocols, the EV sector can enhance workplace safety, comply with industry standards and mitigating any risks associated with high voltage systems in electrical vehicles.
The mats are tested to IEC61111 and certification is provided upon request.

Insulating Matting | Thorne & Derrick hold the largest stocks in the UK of all types and Class of electrical matting for LV MV HV substations and switchgear applications to protect workers from protect people from hazardous electric shocks.
Purposes of using EV Insulated Matting
EV insulated matting is commonly used for a variety of reasons:
- Electrical Safety – Electric Vehicles (EV) operate with high voltage systems, preventing a risk of electrical shock during maintenance or repair.
- Preventing Grounding
- Compliance with Safety Standards
- Workplace Safety Practices
- Protecting against accidents
Meeting these specific standards is essential for creating a safe working environment and ensuring the well-being of technicians.

EV Insulated Mats | Compliance with IEC Standards
IEC61111 Standards
Insulated Mats, manufactured by CATU Electrical Safety and distributed by Thorne & Derrick from elastomer is used to cover ground for electrical protection of operators during work or interventions on electrical installations. By incorporating insulated matting into safety protocols, the EV sector can enhance workplace safety, comply with industry standards and mitigating any risks associated with high voltage systems in electrical vehicles.
The withstand test of insulating matting for electrical insulation is applied to each manufacturing batch of switchboard matting to ensure it does not have an electrical breakdown if exposed to high voltages – the working and withstand voltages must not be confused.
The proof test of insulating matting are dielectrical resistance tests provided by the mat manufacturer on the total running metre of the product and are used to safeguard a standard conformity of resistance throughout the entire section, roll or surface area of the electrical mat – the proof test must be applied to the insulating mats for a set time at a specified voltage level.
The information table below highlights and explains the IEC standard classification according to the maximum working voltages for rubber insulating matting.
| Class Of Insulating Matting According To IEC61111 | Proof Test | AC Maximum Working Voltage | Withstand Test Of Insulating Matting |
| Class 0 Matting | 5kV | 1000V – LV Low Voltage | 10kV |
| Class 1 Matting | 10kV | 7500V – MV Medium Voltage | 20kV |
| Class 2 Matting | 20kV | 17000V – MV Medium Voltage | 30kV |
| Class 3 Matting | 30kV | 26500V – MV Medium Voltage | 40kV |
| Class 4 Matting | 40kV | 36000V – HV High Voltage | 50kV |

High Voltage Electrical Safety
Further Reading
- Electrical Safety – Arc Flash Accidents & Electrocution In LV-HV Installations
- Arc Flash Calculation – Selecting Clothing & PPE To Protect Lives Against Arc Hazard
- IEC 61482-2:2018 – Get Up To Speed With The New Arc Flash Standard
- Arc Flash PPE | 7 Top Considerations
- Arc Flash The Basics

Insulating Matting | Voltage Detectors | Substation Kits | Phase Comparators

Arc Flash Clothing | Polo Shirts | Jackets | Coveralls | Trousers | Sweatshirts | Helmets
THORNE & DERRICK
Thorne & Derrick are national distributors of LV, MV & HV Cable Installation, Jointing, Substation & Electrical Equipment – servicing businesses involved in cabling, jointing, substation, earthing, overhead line and electrical construction at LV, 11kV, 33kV, 66kV and EHV. Supplying a complete range of power cable accessories to support the installation and maintenance of low/medium and high voltage power systems:
- Slip-on Cable Terminations
- Cold-shrink Cable Terminations
- Heat-shrink Cable Terminations
- Cable Joints – Heat & Cold-shrink
- Separable Connectors (Euromold)
- Surge Arresters & Switchgear/Transformer Bushings
Key Product Categories: Duct Seals | Cable Cleats | Cable Glands | Electrical Safety | Arc Flash Protection | Cable Jointing Tools | Cable Pulling | Earthing | Feeder Pillars | Cable Joints LV | Joints & Terminations MVÂ

Thorne & Derrick stock and distribute a complete range of IEC61111 insulating matting for electrical safety, protection and working on low, medium and high voltage substations and switchgear up to 33kV – the IEC61111 standard provides a selection category for Low Voltage (1000V) to High Voltage (36kV).
Medium Voltage Jointing & Termination Programme | 3M Cold Shrink
December 13th, 2023
Medium Voltage Jointing
During our monthly Distributor Review Meeting this morning with Kate Palmer-Randle we discussed further developing the Qualified Electrical Construction Contractor Accreditation (QECC) from 3M Electrical in the UK.
The Qualified Electrical Construction Contractor Programme (QECC) has been set up as a partnership designed to provide valuable benefits to appointed 3M Electrical Contractor Partners.
As part of the QECC programme, contractors receive in-depth 3M product and technology training, including theoretical training on 11kV, 22kV, 33kV, 52kV & 66kV Cable Accessories, including Joints & Terminations.
Once Certified the QECC contractor can apply for a 3M 20-year MV Product Warranty) on completed projects which can be passed on to their client to offer them peace of mind on their investments and evidence Competency.
To date four companies have been geographically appointed, with a select number of new members set to qualify over the coming months.
Choosing a 3M QECC certificated company allows you to have peace of mind that the contractors you’re working with are trained to the highest level and backed by an extended 3M 20-year product warranty.
Thorne & Derrick distribute the most extensive range of MV HV Medium & High Voltage Cable Joints, Terminations & Connectors from manufacturers including 3M, Prysmian, Nexans Euromold, Elastimold, Pfisterer CONNEX & SEANEX.
Heat shrink, cold shrink, push-on and slip-over cable accessories enable the jointing, terminating and connection of 11kV-33kV and 66kV-132kV cables to oil, air or gas insulated switchgear, transformers, motors and overhead lines distributing electricity at medium/high voltages.
Thorne & Derrick hold large stocks of 11kV 33kV 66kV Joints & Terminations suitable for XLPE, PILC and EPR cables, in both heat shrink and Cold Shrink technologies, to service the medium/high voltage power cable accessory requirements of UK and international customers.












