There is a great deal of confusion surrounding the requirements for electrical equipment which is in direct contact with the process, specifically; is a Secondary Seal required? Does my device require the “Single Seal” or “Dual Seal” markings? Are there other options? etc. I’ll try to answer some of these questions. A Process Seal is a device to prevent the migration of process fluids from the designed containment into the external electrical system. Electrical equipment with an interface in direct contact with process fluids under pressure must incorporate a “process seal” to prevent migration of the flammable fluid into the wiring system. The Canadian Electrical Code (2012), Rule 18-072 and the National Electrical Code (2011), Rules 501.17 and 505.26, both contain requirements, which to paraphrase, state, “Process-connected electrical equipment that incorporates a single process seal such as; a single compression seal, diaphragm, or tube to prevent flammable or combustible fluids from entering a conduit or cable system capable of transmitting fluids, shall be provided with additional means to mitigate a single process seal failure”.
Certification of electrical equipment for use in hazardous locations has become a complex landscape of confusing options. The process can be frustrating, expensive and time-consuming.
If you keep certification in mind from the beginning of your design cycle through prototyping and final production, you can avoid many of the delays and pitfalls that occur from inadequate understanding of the required standards, thereby speeding your time to market.
If you are an end-user it is important that all products you will use in your application have the proper certifications for safe installation in hazardous areas.
Armed with knowledge and working with a trusted certification agency (there are many to choose from in Canada who are approved by Industry Canada), both manufacturers and end-users can reduce hassles from the certification process.
Wireless is nothing new; for more than three decades it has been part of our daily lives. From cell phones to garage door openers we know the existence and reliability of (or lack thereof) these systems. As with any technology that advances in the commercial level, it usually takes years to get the new technology into industry, where the requirements are generally very different than for commercial grade products.
The environment where the industrial equipment resides can be very harsh for a standard commercial product. Variables like vibration, shock, humidity, temperature and EMI play a major factor when designers write the specification of a product. Industrial products also need to fulfill specific certifications that will allow the product to be installed in a certain application, i.e. CSA Class1Div2 for Hazardous Environment where the module’s body temperature or any spark due to a connector or an electromechanical relay can ignite an explosion in a hazardous atmosphere. There are numerous types of standards in several industries, i.e. Nuclear, Mining, Transportation, Ship Building, etc.