1. Chakraborty N, Scheid A (2014) History of development of FLP /IS electrical and emerging trends in development. In: 2nd international seminar & exhibition on “Recent trend in design, development, testing and certification of ex-equipment for explosive atmosphere, 7–9 Nov 2014, at Kolkata, India
2. BS 229-1926 for certification flameproof equipment
3. Coal Mine Act 1911
4. BS 1259: 1945 Intrinsically safe electrical apparatus and circuits for use in explosive atmospheres
5. BS 1259: 1958 Intrinsic ally safe electrical apparatus and circuits for use in explosive atmospheres