Thorne & Derrick are leaders in the development and distribution of Product Innovations that deliver significant improvements to clients plant, people and operational safety in the explosive atmosphere industries.
Your proactive problem solvers experienced in succession planning for the replacement of obsolete, non-conformant and legacy equipment in hazardous areas.
Your first-choice provider of innovative and competitive solutions to ensure ATEX & IECEx Compliance for Hazardous Area Electrical, HVAC & Process Instrumentation Equipment to your UK and international projects.
Control Panels | Plugs | Isolators | Enclosures & Junction Boxes | Lighting | Control Stations | Motor Starters | Heat Trace | Gas Detection | Flame Detection | Process Instrumentation | Process Heating | Ventilation Fans | Security Access Control
Competitive Prices | Extensive Stocks | Technical Support | Express Delivery
Published 14 Jul 2026
Electrical Heat Tracing Design & Cable Output Quick Navigation Trace Heating Heat Loss Calculation Overview Why Is a Heat Loss Calculation Required? Information Required for the Calculation Required Maintain Temperature Minimum Ambient Temperature Temperature Difference Pipe Diameter & Material Insulation Material & Thickness Indoor, Outdoor & Weather Conditions Valves,...
Published 12 Jun 2026
Ex d and Ex e are two common explosion protection methods used for electrical equipment in hazardous areas. Ex d refers to flameproof protection, where an enclosure is designed to contain an internal explosion and prevent flame transmission to the surrounding atmosphere. Ex e refers to increased safety protection,...
Published 12 Jun 2026
Intrinsic safety is an explosion protection technique used in hazardous areas to prevent electrical equipment and circuits from releasing enough energy to ignite a flammable gas, vapour, mist or dust atmosphere. In Ex markings, intrinsic safety is shown as Ex i, with common protection levels including Ex ia, Ex...
Published 12 Jun 2026
Equipment Protection Levels, often shortened to EPLs, are used in hazardous area equipment markings to show the level of ignition protection provided by equipment used in explosive atmospheres. Common EPL markings include Ga, Gb, Gc, Da, Db and Dc. In simple terms, EPLs help show whether equipment is suitable...
Published 12 Jun 2026
Gas groups IIA, IIB and IIC are hazardous area classifications used to group flammable gases and vapours according to their explosion characteristics. They help engineers, buyers and safety teams confirm whether hazardous area equipment is suitable for the explosive atmosphere present on site. In simple terms, IIA, IIB and...
