We have an unusual situation, where we have to pass a conduit through a natural gas meter vault. The The only thing contained in the vault is the meter, no overpressure devices or the like. The vault is under a sidewalk with a metal grate covering it. Since during normal operation there is no release of gases It should not have to be a hazardous location. The inspector is also unsure of this also. Installing seal offs on this conduit would be very hard due to space limitations where it exits the vault to the building. Anybody had this problem before?