Special care must be taken when using electrical appliances in potentially explosive atmospheres. The safety of workers and systems has top priority. A proven and flexible protection method to ensure the safety of products used in hazardous areas is the intrinsic safety type of protection. Corresponding product safety standards regulate the safe operation of devices in potentially explosive atmospheres. These standards define limit values for parameters such as voltage, current and capacitance, known as entity parameters. In this context, control drawings, which are mainly required for installations in the USA and Canada, illustrate how the components are interconnected within these safety parameters. This is critical for regulatory compliance and installation safety. Learn more about the standards, area classifications, parameters and their interrelationships for an intrinsically safe circuit.