What should you do?
Preventive fire protection is becoming the key issue in the field of company security, because operational interruptions and damage to property due to fire incidences can threaten the companies' existence. No company can afford this. Therefore, all persons responsible for electrical safety should place enormous demands on preventive fire protection.
In order to effectively address the fire protection problem in electrical installations, continuous monitoring for residual currents of essential installations or installation parts and devices is the method of choice. For this purpose, residual current monitors or residual current monitoring systems are to be installed in addition to existing protective devices.
DIN VDE 0100-530 (VDE 0100-530):2018-06 "Erection of low voltage electrical installations – Part 530: Selection and erection of electrical equipment – Switchgear and control gear" comments
1. In section “532 Equipment for protection against fire risks”: “If in specific application cases a residual current device (RCD) in accordance with 522.214.171.124 cannot be used, because the operational current of the circuit to be protected is greater than the greatest rated current of a residual current device (RCD), for example, it is recommended to apply the following measures: “Use of residual current monitors (RCMs) according to DIN EN 62020 (VDE 0663) together with circuit breakers if their supply voltage is isolated from the supplying system.”
2. In section “532.3 Residual current monitors (RCMs) for protection against fire risks in IT systems”: “Instead of residual current protective devices (RCDs), residual current monitors (RCMs) can be used in IT systems, provided that the area is monitored by electrically skilled persons. Residual current monitors (RCMs) must be in compliance with DIN EN 62020 (VDE 0663) and must be operated in combination with a switching device suitable for isolation. Residual current monitors (RCMs) must be installed at the beginning of the final circuit. The residual operating current must not exceed 300 mA.”
3. In section “532.4 Insulation monitoring devices (IMDs) for protection against fire risks in IT systems” the use of insulation monitoring devices according to DIN EN 61557-8 and insulation fault location systems according DIN EN 61557-9 is recommended. RCMs with a residual operating current of 300 mA are required by the DIN VDE 0100-482 standard for locations prone to fire hazards.