GOST R 51330.2-1999 爆炸性氣體環境用電氣設備.第1部分:電氣設備放火外殼的結構與驗證測試.增補(一).附錄D.確定最大試驗安全間隙的測試方法
Electrical apparatus for explosive gas atmospheres. Part 1. Construction and verification test of flameproof enclosures of electrical apparatus. First supplement. Appendix D. Method of test for ascertaintment of maximum experimental safe gap