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REAL Alternatives Module 2 Design Differences for Alternative Refrigerants | 31 2‐ Fuse enclosures shall be interlocked so that the fuses can only be removed or replaced with the supply disconnected or the enclosure shall carry the following warning label 18: WARNING – do not remove or replace fuse when energised Non sheathed single cores shall not be used for live conductors, unless they are installed inside switch boards, enclosures or conduit systems 19. 3‐ Fans. Ventilation can negate the need for changes to electrical devices or enclosures either: Condenser fans can be run constantly (i.e. not switched off when the system is down to temperature). This will increase the power consumption of the system; or A supplementary fan can be switched on when the condenser fan is off. Sufficient air flow is usually provided by a smaller fan than that used for condenser cooling, so the power requirement associated with this option is usually less than constantly running a condenser fan. The airflow of the supplementary fan must be tested with leak simulation to ensure the airflow is sufficient to disperse the HC refrigerant. Careful consideration should be given to fouled condensers or failed fan motors which would significantly reduce available airflow, especially if they are the primary protection method for sources of ignition. 18 EN60079‐15:2010 Explosive atmospheres – Equipment protection by type of protection “n” , 9.4 19 EN60079‐14:2008 Explosive atmospheres – Electrical installations design, selection and erection, 9.3.5PDF Image | Alternative Refrigerants
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