NB/T 11437-2023 Voltage conversion and protection devices of explosion-proof iron removers used in mines

GB/T 2423.4-2008 Environmental testing for electric and electronic products—Part 2:Test method—Test Db:Damp heat,cyclic(12 h+12 h cycle) GB/T 3836.1-2021 Explosive atmospheres—Part 1:Equipment—General requirements GB/T 3836.2-2021 Explosive atmospheres—Part 2:Equipment protection by flameproof enclosures “d” GB/T 3836.3-2021 Explosive atmospheres—Part 3:Equipment protection by increased safety “e” GB/T 3836.4-2021 Explosive atmospheres—art 4:Equipment protection by intrinsic safety “i” GB/T 4208-2017 Degrees of protection provided by enclosure(IP code) GB/T 9969-2008 General principles for preparation of instructions for use of industrial products GB 9969.1-1998 General principles for preparation of instructions for use of industrial products GB/T 10111-1988 Methods for random sampling by utilizing dices of random number GB/T 10111-2008 Generation of random numbers and procedures applied to sampling inspection for product quality GB/T 14048.1-2023 Low-voltage switchgear and controlgear—Part 1:General rules GB/T 14048.4-2020 Low-voltage switchgear and controlgear—Part 4-1:Contactors and motor-starters—Electromechanical contactors and motor-starters(Including motor protector) AQ 1043-2007 Mining Product Safety Mark Identification JB/T 501-2020