GOST R 51330.2-1999 爆炸性气体环境用电气设备.第1部分:电气设备放火外壳的结构与验证测试.增补(一).附录D.确定最大试验安全间隙的测试方法
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