Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. - Equipment for testing, measuring or monitoring of protective measures - Part 15: Functional safety requirements for insulation monitoring devices in IT systems and equipment for insulation fault location in IT systems

IEC 61557-15:2014 specifies requirements related to functional safety and is based on the IEC 61508 standard series for the realization of Insulation Monitoring Devices (IMD) as specified in IEC 61557-8 and for Insulation Fault Location Systems (IFLS) according to IEC 61557-9, according to phase 10 of the IEC 61508-1 lifecycle. These devices provide safety related functions for IT systems. This part of IEC 61557 is

- concerned only with functional safety requirements intended to reduce the functional risk during the use of IMDs and IFLSs;

- restricted to risks arising directly from the device itself or from several IMDs or IFLSs working together in a system; and

- intended to define the basic safety functions provided by the devices. This part of IEC 61557 does not

- deal with electrical safety according to IEC 61010-1 and the requirements of IEC 61557-8 and IEC 61557-9;

- cover the hazard and risk analysis of a particular use of the IMD or IFLS;

- identify all the safety functions for the application in which the IMD or IFLS is used; and

- cover the IMD or IFLS manufacturing process. This part of IEC 61557 is to be used in conjunction with Part 8 and Part 9. Functional safe