IMPACT ANALYSIS: GB Safety of Information Technology Equipment
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1 Page 1 of 11 IMPACT ANALYSIS: GB Safety of Information Technology Equipment Technical Editor: Marshal Zhang Senior Project Engineer Product Safety UL-CCIC Company Limited This analysis is intended to identify and analyze the impact of notable differences between IEC and GB standards for Safety of Information Technology Equipment (ITE). In particular, the National Differences in GB is being analyzed and compared to IEC Second Edition 2005, including its First Amendment This analysis will permit persons already familiar with IEC to become familiar with the likely impact on ITE of the latest GB ITE Safety Standards. This analysis will be updated as additional information on the application of the new Standards becomes known. Background IEC is the International Standard for Safety of Information Technology Equipment. It encompasses under its scope information technology equipment, communications equipment, office appliances and multi-media equipment for use in the home, office, business, school, computer room and similar locations. IEC is developed/maintained by IEC Technical Committee (TC) 108, Maintenance Team No. 2 (MT2): Safety and Energy Efficiency of Information Technology Equipment. In China, the ITE Standard, formally designated GB , is based on the Second Edition of IEC , and like its predecessors includes China Deviations to address National requirements not in the base IEC document. The Effective Dates for formal implementation of GB are outlined on the CQC website -
2 Page 2 of 11 Notes to this Analysis: Unless otherwise noted, all Sub-clause/Annex references are to the GB Explanation of Impact Statements: Statement Minor* Considerable* Impact Virtually no impact on most ITE due to the difference. Limited impact some or all ITE due to the difference. Potentially considerable impact on some or all ITE due to the difference, as indicated. * For additional/deviated requirements that are more onerous than the IEC requirements, the Impact Statement (Minor, Considerable) will be followed by a (+). For additional/deviated requirements that are less onerous than the IEC requirements, the Impact Statement (Minor, Considerable) will be followed by a (-). No symbol next to a Minor statement indicates that although there could be limited impact, it is indeterminate whether it will be slightly more or less.
3 Page 3 of Unless specified by manufacturer, the equipment is to be used at 5000m altitude above sea level For equipment intended for direct connection to an AC mains supply, the minimum tolerances on RATED VOLTAGE shall be taken as +10 % and 10 %, Tma is the maximum ambient temperature permitted by the manufacturer's specification, or 35 C, whichever is greater. For equipment not to be operated under tropical climatic conditions, Tma is the maximum ambient temperature permitted by the manufacturer's specification, or 25 C, whichever is greater Additional note after the first break off section: Note - A component used shall comply with related requirements corresponding an altitude of m. Larger clearances will be required unless otherwise specified by the manufacturer. See Wider tolerance range will be required. Higher T ma unless the equipment is not intended to be operated under tropical climate conditions. See In the absence of the marking of specifying the altitude is not exceeding 2,000 m, the component shall comply with the relevant requirements for an altitude of 5000m.
4 Page 4 of The required marking and instruction should be given in normative Chinese unless otherwise specified. Markings and instructions are to be in normative Chinese The nominal ac mains voltage is 220 V single phase, 380 V threephase in China. Voltage ratings for single phase equipment shall include 220 V; 220V single phase or 380V three-phase is to be included in voltage rating. Voltage rating for three-phase equipment shall include 380 V. For equipment with multiple voltages / voltage ranges, it shall set the voltage rating / voltage range to include 220V single phase or 380V three-phase before shipment The normal ac mains frequency is 50 Hz in China, Unless the equipment is designed for dc only, the equipment shall be rated 50Hz or include 50Hz. 50Hz is to be included in frequency rating.
5 Page 5 of Additional marking/instruction is required for equipment intended to be used at altitude not more than 2000m above sea level. Statement 仅适用于海拔 2000m 以下地区安全使 用 或类似的警告语句 (Translated from Chinese as below) Used only at altitudes not more than 2000m above sea level or similar. Symbol Additional marking / instruction may be required. If only the symbol used, the explanation of the symbol shall be contained in the instruction manual.
6 Page 6 of Additional marking/instruction is required for equipment intended to be used in non-tropical conditions. Statement 仅适用于非热带气候条件下安全使用 或类似的警告语句 (Translated from Chinese as below) Used only in non-tropical conditions or similar Symbol Additional marking / instruction may be required If only the symbol used, the explanation of the symbol shall be contained in the instruction manual. Safety caution statement shall be in a language that is acceptable in the target distribution area( Annex EE provides examples in languages of Han, Tibet, Mongolia, Chuang, Uighur nationality) Additional language for safety caution statement may be required Unless specified, protection devices against abnormal operating and faults conditions shall be included as parts of the equipment. Minor (+) Additional protection device may be required to include in equipment.
7 Page 7 of For equipment used in non-tropical conditions, the humidity conditioning criteria are to align with IEC requirement For equipment used in tropical conditions, the humidity condition criteria are 40 C ± 2 C /93 % ± 3 %Relative Humidity/120h The evaluation for insulation material used at altitudes more than 2000m up to 5000m is under consideration For equipment used at altitudes more than 2000m up to 5000m, the minimum clearance is to be multiplied by the factor of 1.48 given in Table A.2 of GB/T (Equivalent to IEC ) at 5000m altitude For equipment used at altitudes more than 5000m, the minimum clearance is to be multiplied by the factor given in Table A.2 of Table A.2 of GB/T (Equivalent to IEC ) at correlated altitude. Minor (+) Additional humidity conditioning requirement for equipment used in tropical conditions. This is more onerous requirement than IEC and the previous edition of GB, but the impact is expected to be minimal. Informative note. Align with Align with
8 Page 8 of For equipment used at altitudes more than 2000m up to 5000m, the minimum clearance is to be multiplied by the factor of 1.48 given in Table A.2 of GB/T (Equivalent to IEC ) at 5000m altitude. Align with For equipment used at altitudes more than 5000m, the minimum clearance is to be multiplied by the factor given in Table A.2 of Table A.2 of GB/T (Equivalent to IEC ) at correlated altitude Revise table 2K title to reflect it only applies at altitudes up to 2000m above sea level. Clarification Revise table 2L title to reflect it only applies at altitudes up to 2000m above sea level For equipment used at altitudes more than 2000m up to 5000m, the minimum clearance is to be multiplied by the factor of 1.48 given in Table A.2 of GB/T (Equivalent to IEC ) at 5000m altitude. Clarification. Align with For equipment used at altitudes more than 5000m, the minimum clearance is to be multiplied by the factor given in Table A.2 of Table A.2 of GB/T (Equivalent to IEC ) at correlated altitude Revise table 2M title to reflect it only applies at altitudes up to 2000m above sea level. Clarification.
9 Page 9 of Plugs are to comply with national standards (GB 1002, GB 1003 or GB/T 11918) Minor (+) National component deviation Replace IEC with national standard GB Minor (+) National component deviation. Annex E Last section of Annex E amended as: For comparison of winding temperatures determined by the resistance method of this annex with the temperature limits of Table 4B, 35 C shall be added to the calculated temperature rise. And add note: for equipment not to be operated at tropical climatic conditions, 25 C shall be added to the calculated temperature rise to compare with the temperature of Table 4B. Align with
10 Page 10 of 11 Annex G.6 Annex P Annex CC Change the second section of Clause G.6 to be: For equipment to be operated at 2000 m m above sea level, the minimum CLEARANCE shall be multiplied by the factor of 1.48 corresponding altitude of 5000m given in Table A.2 of GB/T For equipment to be operated at more than 5000 m above sea level, the minimum CLEARANCE shall be multiplied by the factor given in Table A.2 of IEC Linear interpolation is permitted between the nearest two points in Table A.2. The calculated minimum CLEARANCE using this multiplication factor shall be rounded up to the next higher 0,1 mm increment. Normative reference; IEC standards are replaced by national standard or industry standard in China. Normative reference / bibliography comparison table for IEC :2005 and this standard Align with National deviation. Annex BB Annex DD Difference between this edition and GB Description of new added symbol for low altitude and non-tropical conditions.
11 Page 11 of 11 Annex EE Illustration relative to safety explanation in normative Chinese Tibetan Mongolian Zhuang Language and Uighu. Additional language for safety caution statement may be required.
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