IPFirst number - Protection against solid objects
No special protection
Protected against solid objects over 50 mm, e.g. accidental touch by persons hands.
Protected against solid objects over 12 mm, e.g. persons fingers.
Protected against solid objects over 2.5 mm (tools and wires).
Protected against solid objects over 1 mm (tools, wires, and small wires).
Protected against dust limited ingress (no harmful deposit).
Totally protected against dust.
IP Second number - Protection against liquids
Protection against vertically falling drops of water e.g. condensation.
Protection against direct sprays of water up to 15o from the vertical.
Protected against direct sprays of water up to 60o from the vertical.
Protection against water sprayed from all directions - limited ingress permitted.
Protected against low pressure jets of water from all directions - limited ingress.
Protected against temporary flooding of water, e.g. for use on ship decks - limited ingress permitted.
Protected against the effect of immersion between 15 cm and 1 m.
Protects against long periods of immersion under pressure.
D. Eugene Thompson, AIA