Thorne & Derrick are leading distributors and stockists of the Eltherm range of electrical heat tracing systems and components, engineered for industrial, commercial, and hazardous area applications.
Eltherm is a globally recognised manufacturer of innovative heating solutions, specialising in ATEX-certified heat tracing technology designed to:
Maintain process temperatures
Prevent freezing
Provide thermal protection in mission-critical environments
Our team of trained sales engineers is available to support your heat tracing needs — from designing complex, multi-kilometre systems for major projects to supplying custom heating cable kits for plant winterisation and factory applications.
We supply Eltherm’s extensive range of ATEX, IECEx, and UKEX-certified heat tracing products & Hazardous Area Electrical Heating Solutions, suitable for installation in:
Zone 1 and Zone 2 hazardous areas
UL/CSA Class I Division 1 & 2 (C1D1/C1D2) classifications
We serve industries such as oil & gas, chemicals, food & beverage, and water treatment, offering tailored, compliant, and energy-efficient solutions.
Uncontrolled heat loss can lead to:
A heat loss calculation determines the rate at which heat escapes from a system to its surrounding environment. Key factors include:
✅ Material composition
✅ Surface area exposure
✅ Ambient and internal temperatures
✅ Insulation properties
✅ Environmental conditions (e.g., wind, humidity, altitude)
Our heat loss calculation services include: IBC & Drum Heating
Maintain optimal temperatures for viscous fluids such as bitumen, oils, and chemicals — preventing crystallisation or degradation.
Pipework & Valve Trace Heating
Protect pipelines from freezing and maintain flow during cold conditions.
Tank & Vessel Heating
Ensure critical storage tank temperatures in sectors like food processing, pharmaceuticals, and petrochemicals.
Hazardous Area Heating
ATEX/IECEx certified heat tracing for safe operation in explosive gas and dust environments.
What sets Thorne & Derrick apart?
✔️ Decades of experience
✔️ In-house technical support
✔️ Certified ATEX/IECEx solutions
✔️ Fast, responsive design-to-delivery service
With over 35 years of experience, Thorne & Derrick are trusted specialists in electrical, mechanical, and process safety equipment for explosive and industrial environments. We offer:
Innovative heating, lighting, and power systems
Expertise in hazardous area compliance
Support for global clients across oil & gas, petrochemicals, water treatment, and manufacturing
(L To R) – Jessica Williams (CEO of Just Williams Ltd), Dylan White (Sales Engineer), Regan Redpath (Apprentice Sales Engineer), Chloe Johnston (Apprentice Sales Engineer), Charlie Baines (Apprentice Sales Engineer), Aiden Dawson (SEO Specialist), Laurence Taylor (Sales Engineer), Ella Bradley (Apprentice Sales Engineer), Mia Lynn (Administrative Assistant Apprentice), Millie Temple (Content Creator Apprentice).
Yesterday, the team at Thorne & Derrick International had the pleasure of hosting JWSA Sales Academy for an intensive and engaging sales and marketing training session. Led by Jessica Williams, founder and CEO of Just Williams Ltd, the session brought fresh insights, practical tools, and strategies to strengthen Thorne & Derrick’s position as a leader in hazardous areas and industrial equipment distribution.
The training session centred around building a solutions-driven mindset—one that addresses customer pain points with tailored approaches. The session kicked off with an engaging presentation by Jessica, who encouraged the team to think beyond traditional sales & marketing tactics and focus on crafting customer-centric solutions.
Topics covered included:
The team actively participated in discussions, sharing their experiences while absorbing Jessica’s expert advice. It was a collaborative and motivating environment that combined Thorne & Derrick’s expertise with Jessica’s fresh perspective. The exercises and tailored examples resonated with everyone, making the session not just theoretical but highly practical.
The highlight of the day was the hands-on application of key principles, with the team brainstorming real-world scenarios to practice their new skills. This tangible approach ensured everyone left the session feeling confident and empowered to implement what they’d learned.
Jessica also got hands-on with Thorne & Derrick’s ShoveIt manufactured by Hand Safety Tool, showcasing her enthusiasm for the company’s innovative products.
Thorne & Derrick’s team expressed their appreciation for the session, describing it as an invigorating experience. One team member noted, “The tools and strategies we learned today will have an immediate impact on the way we approach clients and marketing efforts. Jessica’s insight was invaluable.”
As the team applies their newfound skills, customers can expect an even higher standard of service and solutions from Thorne & Derrick. Yesterday’s training is a clear step forward in their journey to deliver excellence and innovation at every turn.
Feel free to contact us today to discuss any of your upcoming projects or enquiries!
Aiden Dawson (SEO Specialist) – “Jess’ sales academy was executed brilliantly, being straight-up, insightful and perfect for building on team unity. Jess as a person, is a breath of fresh air and offers a multitude of skill sets that allowed her to dissect the ins and outs of T&D’s sales and marketing structure in no time at all, providing the opportunity to uncover the chinks in our armour and delivering crucial insights on how we can improve, both as a team and individually. It’s clear why the Just Williams Sales Academy is an ideal solution to business growth and I’d personally recommend the academy to any business, regardless of industry or niche.”
Chloe Johnston – (Apprentice Sales Engineer) – “The Just Williams Sales Academy was valuable and insightful in providing practical, hands-on training in key sales skills. It offered a structured approach to improving communication, client engagement, and relationship-building techniques. The academy enabled us to understand the sales process, from prospecting to closing deals. It also provided valuable insights into overcoming objections and tailoring sales strategies to meet individual client needs. Jess expressed the value of Linked In and how we can interact with our customers and connections.”
Charlie Baines (Apprentice Sales Engineer) – “Jess’ sales academy was masterfully conducted, providing direct, insightful training that strengthened team cohesion. Jess brings a refreshing presence and a wide range of skills, allowing her to swiftly evaluate T&D’s sales and marketing framework, pinpoint areas for improvement, and offer essential guidance for both team and individual growth. I would recommend the sales academy to any business, as I am sure the other participants would also.”
Ella Bradley (Apprentice Sales Engineer) – “Yesterday’s training not only emphasized personal growth and self-improvement but also fostered a strong sense of camaraderie within our sales team. It was inspiring to experience the collective support and encouragement from everyone, which reinforced the collaborative culture we strive to cultivate. The session provided valuable insights into both individual and team development, leaving us feeling more motivated and united as we continue to pursue our goals together.”
Laurence Taylor (Sales Engineer) – “Jess Williams’ sales training was truly exceptional. The sessions were engaging and packed with practical strategies and tips that can be applied immediately. I highly recommend it to anyone looking to boost their sales skills and achieve better results.”
Specialist Distributors of Electrical Heating, Lighting, Power & Process Instrumentation Equipment with ATEX IECEx Certification and DSEAR Regulatory Compliance to deliver significant safety and reliability improvements in the Industrial, Explosive Atmosphere & Energy sectors. Based in the UK, we are highly customer responsive and absolutely committed to providing a world-class service.
Since 1985, we have provided expert technical support and express delivery from extensive UK stocks to world-wide destinations.
Zone 1 & Zone 2 LED Light Fittings
When it comes to ensuring plant safety, enhancing worker comfort, and managing maintenance costs, the luminaires you select today will play a crucial role for years to come. Emerson™ presents the Linmaster™ LED Series of linear luminaires, designed specifically for rugged Zone 1, 2, 21, and 22 applications.
Please Note: Appleton™ ATX™ Linmaster™ LED Zone 1 Series replaces the FELED Series Luminaires & Linmaster™ LED Zone 2 Series replaces the FNLED Series Luminaires
Certified for IECEx and ATEX installations, the Linmaster™ luminaires offer a hazardous area led lighting performance that matches or surpasses that of our established FE and FN Series fluorescent luminaires, as well as the FELED and FNLED linear non-metallic luminaires. These products have long been regarded as the industry standard.
With the Linmaster™ Series, you can leverage the same footprint and mounting hardware as the FE and FN Series, providing a seamless and efficient retrofit for any existing fluorescent installations. The range of lumen outputs available ensures that you’ll find the right fit for your specific task or general-purpose application, regardless of mounting height.
For unparalleled corrosion resistance, durability, and performance, trust in the Emerson brand. Choose Appleton™ Linmaster™ Series luminaires—your reliable partner in illuminating your workspace.
➡ Read More: Fluorescent Lamp Ban | Plan For A Brighter Future
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Linmaster™ Luminaires make it easy to replace existing fluorescent fixtures because they feature the same mounting dimensions and mounting accessories as original FE and FN fluorescent luminaires. Hazardous Area LED Lighting is available in light output from 2,500 to 7,000 lumens. In the rare event maintenance is needed, the cover can be quickly removed to access the internal components, while the specially designed hinged cover speeds up the process of replacing drivers, or other components.
The Linmaster™ Series includes models that provide illuminance and lighting distribution comparable to our FE Series fluorescent luminaires, with additional models that offer even more application possibilities. Choose the diffused cover option for the greatest uniformity, least amount of glare, best vertical illumination and safest photobiological rating.
The lighting simulation below compares three luminaires, each mounted at 4.5 m (15 ft) in a room with the dimensions 10m (32.8 ft) x 10m (32.8 ft) x 4.5m (15 ft).The photometric simulated colour rendered images below demonstrate the seamless transition with either luminaire.
Lighting Simulation | Hazardous Area LED Lighting v Fluorescent
The Linmaster™ Zone 1 Series Luminaires saves energy while maintaining equivalent required illuminance levels and uniformity to the FE Series Fluorescent Luminaires.
| Series Lumen Output | LELED3 | LELED4 | LELED5 | LELED6 | LELED7 |
| Input Power (W, @230 V) | 26 | 30 | 42 | 51 | 57 |
| Equivalencies (W, Fluorescent) | 3x18W | 2x36W | 3x36W | 2x58W | 3x58W |
| Nominal Lumens1 | 3219 | 3710 | 5398 | 6097 | 6971 |
| Efficacy (up to, lm/W)1 | 124 | 124 | 129 | 120 | 122 |
| Colour Temperature (CCT) (K) | 5000 / 4000 / 3000 / 2200 | ||||
| Colour Rendering Index (CRI) | ≥80 CRI | ||||
| Voltage | 100-277 Vac, 50/60 Hz; 125-300 Vdc; 24-48 Vdc as an option | ||||
| Surge Protection | 6 kV Standard | 4 kV Emergency | ||||
| L70 Lifetime (hrs, reported) | > 102,000 hours at +25 °C (+77 °F) | ||||
| Ambient Temperature2 | -40 °C to +60 °C or +65 °C (-40 °F to +140 °F or +149 °F) | ||||
| Temperature Code2 | T4, T5, or T6 | ||||
| Fixture Weight – kg (lbs) | 5 (11) | 5 (11) | 7.6 (16.7) | 7.6 (16.7) | 7.6 (16.7) |
| Replaceable Parts | Drivers, Replacement Covers, Battery Pack, and Fuse Assembly | ||||
• Certification Type: LELED
— Gas: Zones 1 and 2
– Conforming to ATEX 2014/34/EU: II 2 G
– Type of Protection: Ex eb mb IIC Gb
– Temperature Class: T4
— Dust: Zones 21 and 22
– Conforming to ATEX 2014/34/EU: II 2 D
– Type of Protection: Ex tb IIIC Db
—Standard Luminaire Ambient Temperature:
-40 °C up to +65 °C (-40 °F up to +149 °F), refer to temperature codes table.
—Emergency Luminaire Ambient Temperature:
-20 °C up to +60 °C (-4 °F up to +140 °F)
—ATEX Certificate: INERIS 24ATEX0001X
—IECEx Certificate: IIECEx INE 24.0001X)
• Standard and Emergency:
—Index of Protection according EN/IEC 60529: IP66 / 67 / 68.
—Impact Resistance (shock): IK10
—Photobiological Safety, IEC 62778 and IEC 62471: RG0
Thorne & Derrick International service UK and international projects with a complete range of Explosion Proof Lighting & Electrical Equipment including Ex d Flameproof and Ex e Explosion Proof products.
MARECHAL P66
MARECHAL® P66 plug and socket outlets are heavy duty with current ratings of 660A and are the latest technological development in their industrial plug and socket range.
P66 plug and socket outlets are automatically IP66/IP67 when connected and are suitable for use in quarries, tunnel boring machines, port cranes, mining equipment and all ship to shore applications.
The P66 Complies with the following regulations and standards(a): European Low Voltage and RoHS Directives (CE marking), European REACH Regulation. High-voltage, harsh conditions, mobility features and international safety expectations, P66 stands for robustness, cutting edge technology, sustainability and extreme reliability.
Thorne & Derrick International, based in the UK, are the Preferred UK Distributor for Marechal Plugs, Sockets & Decontactors including Single Pole Connectors for LV Electrical Power Distribution in hazardous area and industrial applications.
Using P66 to electrify your industry means committing to decarbonisation for a cleaner and safer future, while remaining competitive and efficient. To drive the electricity transition, accelerate grid modernisation and expansion, and integrate renewables, our innovation goes beyond connections.
The P66 handles are used to suit different cable diameters, allowing all kinds of configurations. Light, high tech and easy to wire, P66 ensures safety while providing optimum mobility.
The P66 is vibration and corrosion-resistant and waterproof, making the P66 manufactured to live up to the industry’s highest requirements. With it being robust, it ensures longevity and easy and low maintenance thanks to the availability of its original spare parts.
Straight or angled, the P66 handles are made to suit different cable diameters, allowing all kinds of configurations. Light, high tech and easy to wire, P66 ensures safety while providing optimum mobility.
The industry comes with extreme needs that P66 connector is built to address. Vibration and corrosion-resistant, waterproof, P66 is made to live up to the industry highest requirements.
P66 connector robustness ensures longevity, easy and low maintenance thanks to the availability of original spare parts.
Marechal high current plugs & sockets offer an extensive and comprehensive product range for all industrial electrical power applications with power currents varying from 75A to 700A with 1,100 volt power supply and are available from stock from Thorne & Derrick.
The range of Marechal plugs and sockets are available in a range of current ratings, switching capabilities, voltage supply and hazardous area certifications (according to ATEX & IECEx) for safe use in potentially explosive atmospheres – this includes Zone 1 & Zone 2 (Gas) and Zone 21 & Zone 22 (Dusts).
Panels | Plugs | Isolators | Enclosures | Lighting | Control Stations | Motor Starters | Heat Trace | Gas Detection | Flame Detection | Process Instrumentation | Process Heating | Fans | Security Locking & Access Control
Introducing the Next Generation of Self-Regulating Heating Cables for use in explosive atmospheres, the NEW ELSR-H+& ELSR-SH+ cables.
These innovative self-regulating cables, manufactured by Eltherm, are designed for industrial applications that demand robust performance in high-temperature environments. Their cutting-edge technology ensures reliable heat distribution while maintaining safety in potentially explosive atmospheres.
Ensure your operations run smoothly and securely, even in the most challenging conditions. Upgrade to the next generation of heating solutions today!
➡ Contact Thorne & Derrick sales team for the complete range of heat tracing cables
The advanced feature of these heat trace cables are:
Eltherm ELSR-H+ is a self-regulating heat tracing cable provides process temperature maintenance and frost protection to pipework, instrument lines, tanks and drums up to 210° Celsius – with IECEx and ATEX Certification Eltherm ELSR-H+ heat tracing cables are suitable for Zone 1 and Zone 2 hazardous areas.
Eltherm ELSR-H+ Heater Cable wattages per metre at -60°C – 15, 30, 45, 60, 75 watts.
Trace Heater Classification:
Eltherm ELSR-H+ self-regulating heater cables has a BOT cable design which has a high chemical resistance and is able to withstand aggressive chemicals, oil and fuel for improved service life due to the protective braid and fluoropolymer outer jacket.
The Eltherm ELSR-SH+ high temperature self-regulating heat tracing cables is designed for temperature maintenance in industrial processes – and is suitable for use up to 250 °C . The high chemical resistance allows the cables to be installed in environments with exposure to aggressive influences.
The self-regulating heat tracing cable provides frost protection and temperature maintenance to pipework, silos vessels ,tanks, valves and pumps. Suitable for use in the following industries:
Eltherm ELSR-SH+ self-regulating heater cables has a BOT cable design which has a high chemical resistance and is able to withstand aggressive chemicals, oil and fuel for improved service life due to the protective braid and fluoropolymer outer jacket.
Our Team of Trained Sales Engineers are available to advise and support your heat tracing enquiries – this includes design and supply of complex multi-kilometre, major-project systems to custom heat trace cable kits for the protection of winterisation against plant and factory facilities.
See the full range of ELSR-H+ & ELSR-SH+ heat tracing cables below:
| ELSR-H+ Part Number | Heat Tracing Cable Item Number |
| 15W / ELSR-H+-15-2-BOT | B0300153 |
| 30W / ELSR-H+-30-2-BOT | B0300303 |
| 45 W / ELSR-H+-45-2-BOT | B0300453 |
| 60 W / ELSR-H+-60-2-BOT | B0300603 |
| 75 W / ELSR-H+-75-2-BOT | B0300753 |
| ELSR SH+ Part Number | Heat Tracing Cable Item Number |
| 16 W / ELSR-SH+-15-1-BOT | B0310151 |
| 33 W / ELSR-SH+-30-1-BOT | B0310301 |
| 66 W / ELSR-SH+-60-1-BOT | B0310601 |
| ELSR SH+ Part Number 230 VAC | Heat Tracing Cable Item Number |
| 16 W / ELSR-SH+-15-2-BOT | B0310153 |
| 33 W / ELSR-SH+-30-2-BOT | B0310303 |
| 66 W / ELSR-SH+-60-2-BOT | B0310603 |
| 98 W / ELSR-SH+-90-2-BOT | B0310903 |
The new heating cables ELSR-H+ and ELSR-SH+ offer the following benefits:
1. Longevity
ELSR-H+ and ELSR-SH+ impress with their low ageing in the standardised cycle test in accordance with DIN EN 60079-30-1. Compared to conventional heating cables, which pass the cycle test in accordance with DIN EN 60079-30-1 but show a reduction in performance due to temperature ageing, these new cables show negligible performance losses throughout the test and beyond. This means that precise power output is guaranteed even after the duration of the cycle test.
2. Sustainability
Sustainability is a core priority for Eltherm and was an integral part of the development of the self regulating heating cables ELSR-H+ and ELSR-SH+. By recycling process residues, Eltherm have achieved significant savings in fluoropolymers during production. Consequently, Eltherm and Thorne & Derrick are able to reuse up to 10% of the heating cable matrix material in the manufacturing process.
3. Saving weight
The implementation of new manufacturing processes has led to a significant reduction in the cable drum weight. This results in a weight saving up to 15% which reduces the transport weight and improves handling on a construction site.
4. Optimised energy consumption
The precision of the manufacturing processes ensure the exact production of the specified power levels, allowing for precise dosing of the required heating power.
Thorne & Derrick provide a complete portfolio of Electric Process & Heat Tracing Solutions for Industrial, Hazardous Area & Explosive Atmospheres,
Published 13 Mar 2020
Press Release Date: 02.04.2020 uploaded by Chris Dodds (T&D Sales + Marketing Manager) World’s First Fully Certified ATEX Doors Thorne & Derrick International, the Experts in Equipment for Explosive Atmospheres, today announce the signing of a Commercial Distribution Agreement...
Published 04 Jul 2019
Press Release Date: 04.07.2019 uploaded by Chris Dodds (T&D Sales + Marketing Manager) Category: Stockist Distributor Agreement Announcement Thorne & Derrick International announce that they have signed a Preferred Distributor Agreement with Raytec, the world leading manufacturer of LED...
