In order to ensure the waterproof performance of distribution boxes, manufacturers will strictly seal the joints of the box. Usually, rubber sealing rings or sealants are used for sealing to effectively prevent the intrusion of rainwater, sand and dust. After sampling, the sample containers must be checked for leaks. If leaks occur, caps and stoppers should be reinforced or replaced. Preferably use. The lifelines of highly automated industrial production for electrical distribution and for the control and safety technology of manufacturing plants come together in control cabinets and electrical distribution boxes right down to the micro distribution boards. Control cabinets protect and. This directive provides instructions for the uniform use of sample seals to ensure the integrity of samples submitted to FSISlaboratories for analysis. From the extremely compact and award-winning hd 680/hm 780 series to the particularly powerful pro-class hm 850/880 DC-V (see illustration) and hm 3010/20 DC-V models, virtually all hawo devices in this class feature. Remember: GMP requires proper sealing and labeling of all quality control (QC) samples to protect integrity, prevent contamination, and maintain traceability.