1. Select qualified products with "3C" certification.
2. Feem ntau, cov khoom siv Class II yuav tsum tau siv. Cov khoom siv no muaj ob chav rwb thaiv tsev thiab muaj kev nyab xeeb rau kev siv.
3. Thaum ua haujlwm nyob rau hauv cov chaw uas muaj hluav taws xob zoo xws li cov chaw ntub dej lossis cov hlau thav duab, cov khoom siv Class II lossis Class III yuav tsum raug xaiv.
4. Thaum ua haujlwm hauv qhov chaw nqaim xws li cov thawv hlau, cov kav dej, boilers, thiab lwm yam, cov khoom siv hauv chav kawm III yuav tsum tau xaiv.
5. Yog tias nws yog qhov tsim nyog siv cov khoom siv hauv chav kawm I tiag tiag, lwm yam kev ntsuas kev nyab xeeb tsim nyog yuav tsum tau ua raws li qhov yuav tsum tau muaj kev nyab xeeb, xws li kev txhim kho cov khoom tiv thaiv, kev sib cais kev nyab xeeb transformers, thiab lwm yam.
