This standard specifies the scope of application, terminology, product classification, basic parameters, technical requirements, test methods, test specifications, marking, packaging, transportation, storage, etc. of low-voltage DC switchgear (hereinafter referred to as DC equipment). This standard applies to DC equipment with AC rated voltage of 1140V and below, frequency of 50 Hz and 60 Hz, and DC rated voltage of 1000 V and below under normal indoor use conditions. Mainly used as DC operation power supply equipment, frequently loaded power supply equipment in various occasions, emergency power supply equipment, and backup power supply equipment in DC power supply systems. Reference standard GB 7251 Low voltage switchgear GB 3797 Electric control equipment Part 2; Electric control equipment equipped with electronic components GB 9466 Basic test methods for low-voltage switchgear GB 156 Rated voltage GB 762 Rated current of electrical equipment GB 2681 Color of wires in electrical equipment GB 2682 Color of indicator lights and buttons in electrical equipment GB 4208 Classification of protection levels GB 9501 Cadmium nickel high rate alkaline batteries GB 3047 Panel Basic dimensions series of frames and frames JB 3084 Product packaging and transportation regulations for electric transmission control stations
Function of testing report:
1. Project bidding: Issue authoritative third-party CMA/CNAS qualification report
2. Online e-commerce platform entry: Quality inspection report recognized by major e-commerce platforms 3. Used as a sales report: issuing legally effective testing reports to make consumers more confident 4. Papers and research: Provide professional personalized testing needs 5. Judicial services: providing scientific, fair, and accurate testing data 6. Industrial problem diagnosis: Verify the troubleshooting and correction of industrial production problemsBaijian and testing process:
1. Telephone communication and confirmation of requirements
2. Recommend solutions and confirm quotations 3. Mail samples and arrange testing 4. Progress tracking and result feedback 5. Provide reports and after-sales service 6. If urgent or priority processing is requiredTesting and testing characteristics:
1. The testing industry is fully covered, meeting different testing needs
2. Fully cover the laboratory and allocate localized testing nearby3. Engineers provide one-on-one services to make testing more accurate
4. Free initial testing, with no testing fees charged
5. Self service order delivery for free on-site sampling
6. Short cycle, low cost, and attentive service 7. Possess authoritative qualifications such as CMA, CNAS, CAL, etc 8. The testing report is authoritative and effective, and is generally used in China