Every natural gas appliance must be capable of being isolated easily and safely. Isolation valves and final connections are critical points in a residential installation.
Accessibility
The valve must be located in a spot that can be used without the need to disassemble furniture or other components.
Correct positioning
The installation must allow for clear identification of which appliance it isolates.
Flexible connections
Where permitted, they must be suitable for natural gas, have the correct length, and must not be kinked or under stress.
Tightness testing
After every connection or replacement, a tightness test must be performed before the appliance is put into use.
Maintenance
Valves must remain functional, and connections should be periodically inspected for wear or corrosion.