Wɔkyerɛkyerɛ ahobanbɔ gyinabea a ɛwɔ hɔ ma nkyekyɛmu nkukuo no mu sɛdeɛ International Electrotechnical Commission (IEC) gyinapɛn kyerɛ no na ɛkyerɛ titire sɛ mfiri no bɔ wɔn ho ban firi amannɔne nneɛma a ɛyɛ den, nsuo, ne mfuturo ho. Saa levels yi taa gyina hɔ ma IP (ingress protection) code, baabi a "i" gyina hɔ ma ahobammɔ fi amannɔne nneɛma a ɛyɛ den ho na "P" gyina hɔ ma ahobammɔ fi nsu ho.
Ahobanbɔ dodow a wɔtaa de di dwuma no bi ne:
1. IP20: Ɛma ahobanbɔ fi amannɔne nneɛma a ɛyɛ den a ɛboro 12.5 mm nkutoo so na ɛnyɛ nea nsu ntumi nkɔ mu.
2. IP21: Ɛma ahobanbɔ fi ahɔho nneɛma a ɛyɛ den a ɛsõ sen 12.5 mm ho na wɔbɔ ho ban nso fi nsu a ɛtɔ gu fam a ɛtɔ fam ho.
3. IP22: Ɛma ahobanbɔ fi ahɔho nneɛma a ɛyɛ den a ɛsõ sen 12.5 mm ho na wɔbɔ ho ban nso fi nsu a ɛtɔ gu fam a ɛkɔ soro kodu digrii 15 fi baabi a ɛda fam no ho.
4. IP23: Ɛma ahobanbɔ fi ahɔho nneɛma a ɛyɛ den a ɛsõ sen 2.5 mm ho na wɔbɔ ho ban nso fi nsu a ɛtɔ gu fam a ɛkɔ soro kodu digrii 60 fi baabi a ɛda fam no ho.
5. IP44: Wɔabɔ ho ban afi ahɔho nneɛma a ɛyɛ den a ɛsõ sen mm 1 ne nsu a ɛrepetepete ho.
6. IP54: Wɔabɔ ho ban afi amannɔne nneɛma a ɛyɛ den, mfutuma, ne nsu a ɛrepetepete ho.
7. IP55: Wɔabɔ ho ban afi amannɔne nneɛma a ɛyɛ den, mfutuma, ne nsu a ɛrepetepete ho.
8. IP65: Wɔabɔ ho ban afi amannɔne nneɛma a ɛyɛ den, mfutuma, ne nea ɛba fam-nhyɛ nsu a ɛretu no so.
9. IP66: Wɔabɔ ho ban afi amannɔne nneɛma a ɛyɛ den, mfutuma, ne soro-nhyɛ nsu a ɛretu no so.
10. IP67: Wɔabɔ ho ban afi amannɔne nneɛma a ɛyɛ den, mfutuma, ne bere tiaa mu a wɔde wɔn ho bɛhyɛ nsu mu ho.
11. IP68: Wɔabɔ ho ban afi amannɔne nneɛma a ɛyɛ den, mfutuma, ne nsu a wɔde hyɛ nsu mu bere tenten ho. Bere pɔtee a wɔde bɔ ho ban no, nea ɔyɛe no na ɛkyerɛ.