IEC 60364-5-56-2018 pdf free download

IEC 60364-5-56-2018 pdf free download.Low-voltage electrical installations – Part 5-56: Selection and erection of electrical equipment – Safety services.
560.6 Electrical sources for safety services
560.6.1 The following electrical sources for safety services are recognized:
— storage batteries;
— primary cells:
— generator sets independent of the normal supply:
— a separate feeder of the supply network that is effectively independent of the normal feeder.
560.6.2 The electrical source for safety services shall be installed as fixed equipment and in such a manner that it cannot be adversely affected by failure of the normal source.
560.6.3 The electrical source for safety services shall be installed in a suitable location and be accessible only to skilled or instructed persons (BA5 or BA4). Electrical sources for safety services should be segregated from other sources.
Safety services and sources shall be designed and located so as to minimize hazards that could cause fire, flooding, freezing. vandalism and other adverse conditions and impact the availability of the electrical supply.
NOTE See Annex G for gwdance.
560.6.4 The location of the electrical source for safety services shall be properly and adequately ventilated so that exhaust gases, smoke or fumes from the safety source cannot penetrate areas occupied by persons.
560.6.5 Separate, independent feeders from a supply network shall not serve as electrical sources for safety services unless assurance can be obtained that the two supplies are unlikely to fail concurrently.
560.6.6 The electrical source for safety services shall have sufficient capability to supply its related safety service.
560.6.7 An electrical source for safety services may, in addition, be used for purposes other than safety services, provided the availability for safety services is not thereby impaired. A fault occurring in a circuit for purposes other than safety services shall not cause the interruption of any circuit for safety services.
560.6.8 There are special requirements for safety sources not capable of operation in parallel.
Adequate precautions shall be taken to avoid the paralleling of sources.
560.6.9 There are special requirements for safety services having sources capable of operation in parallel.
The parallel operation of independent sources may require special devices, for example to prevent reverse power.
560.6.10 There are requirements for a central power supply system.
Batteries shall be of vented or valve-regulated type with reduced maintenance and shall be of heavy duty industrial design, for example cells complying with IEC 60623 or IEC 60896 (all parts). This does not preclude proven new technologies. The minimum design life of the batteries at 20 9C shall be 10 years.
560.6.11 Where an uninterruptible power supply (UPS) is used, it shall:
a) be able to operate all protective devices located on the load side of the UPS.
b) be able to start the safety services when it is operating in the emergency condition,
c) comply with the requirements of 560.6.10, as applicable,
d) comply with lEG 62040-1, lEG 62040-2 or IEC 62040-3. as applicable, and
e) be able to be started independently of the availability of the upstream supply.
560.6.12 Where a safety generating set is used as an electrical source for safety services, a diesel engine driven generating set shall comply with ISO 8528-12.
560.6.13 The condition of the electrical source for safety services (ready for operation, under fault conditions, feeding from the electrical source for safety services) shall be monitored.
560.7 Electrical circuits of safety services
560.7.1 Circuits of safety services shall be independent of other circuits.
An electrical fault or any modification in one system shall not affect the correct functioning of the other. This may necessitate separation by fire-resistant materials or different routes or enclosures.
560.7.2 Circuits of safety services shall not pass through locations exposed to fire risk (BE2 due to nature of processed or stored materials) unless they are fire-resistant. The circuits shall not, in any case, pass through zones exposed to explosion risk (BE3). Where practicable, the passage of any circuit through locations presenting a fire risk should be avoided.
560.7.3 In accordance with lEG 60364-4-43:2008, 433.3.3, protection against overload may be omitted where the loss of supply may cause a 9reater hazard. Where protection against overload is omitted, the occurrence of an overload shall be monitored.
560.7.4 Overcurrent protective devices shall be selected and erected so as to avoid an overcurrent in one circuit impairing the correct operation of circuits of safety services.
560.7.5 Switchgear and controlgear shall be clearly identified and grouped in locations accessible only to skilled or instructed persons (BA5 or BA4).IEC 60364-5-56 pdf download.