Cold Link Africa July/August 2019 | Page 35

FEATURE INCORPORATING COLD CHAIN solution towards low carbon footprint cooling systems. Considering what has been said, the difficulty in trying to establish who serves on the South African committee, asked to vote on the International Electrotechnical Commission’s (IEC’s) proposal to increase the HC charge limit to 500g, seems incomprehensible. After many attempts prior to 12 April 2019, the closing date of votes on the IEC proposal to increase the HC limit, no contact details of any committee member could be found to discuss the pros or cons of the vote on the IEC proposal. A higher charge will most likely result in more stringent compliance with safety standards similar to all other refrigerants. The IEC is a worldwide organisation for standardisation comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co- operation on all questions concerning standardisation in the electrical and electronic fields. To this end, and in addition to other activities, IEC publishes international standards, technical specifications, technical reports, Publicly Available Specifications (PAS) and Guides. The preparation of such guides and standards is entrusted to technical committees; 2 any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental organisations liaising with IEC also participate in this preparation. IEC collaborates closely with the International Organisation for Standardisation (ISO) in accordance with conditions determined by agreement between the two organisations. The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees. As far as can be established, the voting rights of South Africa and its participation in the IEC on the standard 3 relating to the safety of household and similar appliances, and in particular the requirements for commercial refrigerating appliances and ice makers with an incorporated or remote refrigerant unit or motor compressor, rests with the SC061 committee of the South African Bureau of Standards (SABS). There are perceived safety risks and potential dangers surrounding the use of hydrocarbon refrigerants in domestic and commercial air-conditioning and refrigeration applications. These misconceptions can be minimised by the enforcement of standards, which are drafted by persons who are familiar with the conditions at ground level and have the required technical expertise. If role players in the refrigeration and air-conditioning industry are unable to discuss their concerns or require information regarding the use of HCs, COLD LINK AFRICA • July/August 2019 1. Many bottle coolers in retail outlets are charged with R290. 2. The availability of compressors and components for R290 (propane) is an influencing factor on the choice of refrigerant for new systems. 3. Domestic refrigerators are mostly charged with HC R600a (isobutane). because of not being able to contact the drafting committee, there could be grave consequences on the safe use of HCs in South Africa and a reluctance to gain from maximum charge being increased to 500g per circuit (which has since been approved). In closing, as far as can be established, South Africa abstained from voting on the increase in charge from 150g to 500g. As to the reason for not voting, who knows? CLA 35