' N% U6 A7 E& i$ J电工证不包括煤气,煤气证才可以碰煤气. 4 c* |9 Y. [9 i4 mYour work need Gas Technician ticket. 9 {& k2 g- q6 { y8 g: UIf detector was installed outside the Furnance, nothing connect with it, that is OK. I1 D% D* N3 a- ~: w8 FIf at inside and you did have Safety-Tag on it, your gas valve will be shut off by Gas Tech and got fine.9 t- h- T: l6 D" R0 X