Ushahidi wa Mlipuko wa Shenhai
Jambo kuu la kuzingatia kwa nyenzo za chuma katika vifaa vya umeme visivyolipuka ni tabia yao ya kuwasha mchanganyiko wa hewa ya gesi-kulipuka kupitia cheche za mitambo.. Utafiti umeonyesha kuwa muundo wa metali hizi una jukumu kubwa katika uwezo wao wa kuwasha. To prevent the occurrence of mechanical spark ignition in metal enclosures, specific elemental limitations are mandated. The standards for kulipuka mazingira – General Equipment Requirements – specify the following:
Darasa la I
In producing RPL level MA or Mb vifaa vya umeme visivyolipuka, the composition of aluminum, magnesiamu, titanium, and zirconium in the enclosure materials must not exceed 15% by mass, and the combined mass percentage of titanium, magnesiamu, and zirconium must not surpass 7.5%.
Darasa la II
For Class II explosion-proof electrical equipment production, the total mass percentage of critical elements in enclosure materials varies based on the protection level: For EPLGa equipment, the total content of aluminum, magnesiamu, titanium, and zirconium must not exceed 10%, with magnesium, titanium, and zirconium not exceeding 7.5% in total; For EPLGb equipment, the aggregate content of magnesium and titanium must not exceed 7.5%; In the case of EPLGc equipment, apart from fans, fan covers, and ventilation hole baffles meeting EPLGb standards, there are no additional specific requirements.
Darasa la III
In manufacturing Class III explosion-proof electrical devices, the required total mass percentage of pertinent elements in the enclosure materials also varies with the protection level: For EPLDa devices, magnesium and titanium content should not exceed 7.5%; For EPLDb devices, the same limitation applies; For EPLDc devices, apart from fans, fan covers, and ventilation hole baffles adhering to EPLDb criteria, there are no further special requirements.