286 Commissioning6.1.2 Electrical Safety – Requirements to Be Met by Third-party ManufacturersDANGER!Supply voltageThe device's supply voltage may only be generated by means of a safety power supply unit ofa different make from the one described in the accessories if safety extra-low voltage is used(e.g. to EN 61558-2-6 "Safety of transformers" or EN 60950-1 "Information technology equip-ment – Safety".DANGER!"Flame signal" and "ready" relay contact outputsThe potential-free contact connections of the device's relays may only be wired with safety ex-tra-low voltage in accordance with the requirements for supply voltage.DANGER!"Mode selector" digital inputsThe digital inputs are controlled only via potential-free contacts.DANGER!Communication interfacesThe equipment of other manufacturers connected to the communication interfaces must meetthe requirements of DIN EN 60950-1 "Information technology equipment – Safety".DANGER!Analogue output current loop - Protection against electric shockMeasuring circuits must be separated safely to dangerous active parts according to EN 61140„Protection against electric shock …“. You achieve this by double or reinforced isolation according to EN 61010-1 „Safety re-quirements for electrical equipment for measurement, control and laboratory use“.WARNING!Radio interference suppression of the output contactsIn the interests of safety, ensure when installing the output contacts that: The user suppresses radio interference in such a way that the contacts of the safety relaycontact output cannot be shorted by defective components of the suppressor circuitry.
