HAROLD I agree with Roger I think ART 314.23[A] SURFACE MOUNTING would also cover this .Besides the NEC code I think the fire codes might be a problem .As far as my 15 yrs experince I would change it A.S.A.P. you have a dangerous situation there with those gasses . If something should happen to smash into the safty switch and brake those pipes you have [1] fuel [2]oxygen [3] and the source. Something to think about ?
