Distribution cabinet-te humhalhna level chu International Electrotechnical Commission (IEC) standard-a tarlan a ni a, a bul berah chuan hmanruain ram dang thil nghet, tui leh leivut laka a humhimna a tarlang a ni. Heng level te hi a tlangpuiin IP (ingress protection) code hmanga entir a ni a, chutah chuan "I" chu ram dang thil nghet tak tak laka invenna a ni a, "P" chu tui laka invenna a ni.
Hriselna atana hman tlanglawn level te chu:
1. IP20: Ramdang thil nghet 12.5 mm aia lian lakah chauh venhimna a pe a, tui tlak lohna a ni lo.
2. IP21: 12.5 mm aia lian foreign object solid te laka invenna a pe a, vertically falling water drops lakah pawh a venghim bawk.
3. IP22: solid foreign object 12.5 mm aia lian lakah venhimna a pe a, vertical atanga 15℃thlenga tui tla lakah pawh venhim a ni bawk.
4. IP23: 2.5 mm aia lian foreign object solid te laka invenna a pe a, vertical atanga 60℃thlenga tui tla lakah pawh venhim a ni bawk.
5. IP44: Ramdang thil nung nghet tak tak 1 mm aia lian leh tui thianghlim lo laka ven.
6. IP54: Ramdang thil nghet tak tak, leivut leh tui luang chhuak laka venhim.
7. IP55: Ramdang thil nghet tak tak, leivut leh tui hnim hring (splashing water) laka venhim.
8. IP65: Ram dang thil nghet tak tak, leivut leh low-pressure water jets laka venhim.
9. IP66: Ramdang thil nghet tak tak, leivut leh high-pressure water jets laka venhim.
10. IP67: Ramdang thil nghet tak tak, leivut leh tui chhunga hun eng emaw chen atana inhnim pil lohna laka ven.
11. IP68: Ramdang thil nghet tak tak, leivut leh tui chhunga hun rei tak inhnim pil lohna laka ven. Protection hun chhung bik chu siamtuin a tarlang a ni.