AS NZS 60335.2.51 pdf download

AS NZS 60335.2.51 pdf download.Household and similar electrical appliances—Safety
1 Scope
This clause of Part 1 is replaced by the following. This International Standard deals with the safety of electric stationary circulation pumps for household and similar purposes intended for use in heating systems or in service water systems, their rated voltage being not more than 250 V for single-phase appliances and 480 V for other appliances. NOTE 1 01 The hydraulic and electrical parts of the pump can be in the same enclosure, so that the water flows through the motor and serves as a coolant, or they can be separated. Appliances not intended for normal household use, but that nevertheless may be a source of danger to the public, such as appliances intended to be used by laymen in shops, in light industry and on farms, are within the scope of this standard. As far as is practicable, this standard deals with the common hazards presented by appliances that are encountered by all persons in and around the home. However, in general, it does not take into account – persons (including children) whose · physical, sensory or mental capabilities; or · lack of experience and knowledge prevents them from using the appliance safely without supervision or instruction; – children playing with the appliance. NOTE 1 02 Attention is drawn to the fact that – for appliances intended to be used in vehicles or on board ships or aircraft, additional requirements can be necessary; – in many countries additional requirements are specified by the national health authorities, the national authorities responsible for the protection of labour and similar authorities. NOTE 1 03 This standard does not apply to – pumps for circulating liquids other than water; – pumps, other than circulation pumps (IEC 60335-2-41 ); – circulation pumps intended exclusively for industrial purposes; – circulation pumps intended to be used in locations where special conditions prevail, such as the presence of a corrosive or explosive atmosphere (dust, vapour, or gas).
7 Marking and instructions
This clause of Part 1 is applicable except as follows. 7.1 Addition: Circulation pumps shall be marked with – the TF class; – the direction of the water flow; – the direction of rotation (for pumps having three-phase motors); – the rated current (for pumps having three-phase motors if a protective device has to be installed in the fixed wiring). 7.1 2 Modification: The instruction concerning persons (including children) with reduced physical, sensory or mental capabilities, or lack of experience and knowledge is not applicable. The instruction regarding supervision of children is not applicable. 7.1 2.1 Addition: The installation instructions shall state the substance of the following: – the maximum flow rate or total head; – the maximum ambient temperature at which the pump is to be used; – the maximum system pressure, which shall not be less than: · 0,6 MPa for pumps for heating systems; · 1 ,0 MPa for pumps for service water systems; – the intended orientation of the pump; – a protective device is to be installed in the fixed wiring and its characteristics are to be specified (for pumps having a three-phase motor not incorporating a protective device). – for the thermal insulation of circulation pumps in heating systems, only the supplied kit or a kit made available by the manufacturer shall be used. It shall be ensured that the drain openings of the motor are not sealed after installation of the thermal insulation.
1 1 Heating
This clause of Part 1 is applicable except as follows. 1 1 .2 Addition: Circulation pumps that are only fixed by the water pipes are positioned against one wall of the test corner and away from the other. 1 1 .3 Addition: The temperatures t 1 and t 2 are the ambient temperatures of the environment in which the pump is installed, for instance inside the enclosure of a boiler. 1 1 .7 Replacement: Circulation pumps are operated until steady conditions are established. 1 1 .8 Addition: The temperature rise limits of pumps located within the enclosure of a boiler are reduced by the difference between the ambient temperature at which the test is carried out and 25 °C.