Connecting devices for low voltage circuits for household and similar purposes. Part 2-5. Particular requirements for connecting boxes ( junction and /or tapping of copper conductors) for terminals of connecting devices
State system for ensuring the uniformity of measurements. State primary standard and all-union verification schedule for means measuring volumetric flow of gas within the range of 1x10 in minus 6 up to 1x10 in 2 degree m3/s
