Electrical safety regulations
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Within ( ) meters of electrical equipment such as distribution boxes, switches, and welding machines, it is strictly prohibited to store flammable, explosive, corrosive, or other hazardous materials.
It is strictly prohibited to store flammable, explosive, corrosive, or other hazardous materials within a distance of (15) meters from electrical equipment such as distribution boxes, switches, and welding machines.
The poster is probably from CNPC. Your questions can be found here: Regulations on the Safe Management of Temporary Electricity Use in the Refining Sector of China National Petroleum & Natural Gas Corporation, Oil and Chemicals Document No. [2004]45