IP Rating – Ingress Protection

The IP rating is used to specify the environmental protection of the electrical enclosure which contains the components and control equipment, often stated when panels are likely to be placed outside or when there may be contact with water, dust or other particles.

Ingress Protection (IP) ratings are developed by the European Committee for Electro Technical Standardization (CENELEC) (NEMA IEC 60529 Degrees of Protection Provided by Enclosures – IP Code), specifying the environmental protection the enclosure provides.
The IP rating normally has two (or three) numbers:

Protection from solid objects or materials

Protection from liquids (water)

Protection against mechanical impacts (commonly omitted, the third number is not a part of IEC 6052

Example – IP Rating

With the IP rating IP 54 – 5 describes the level of protection from solid objects and 4 describes the level of protection from liquids.

An “X” can used for one of the digits if there is only one class of protection, i.e. IPX1 which addresses protection against vertically falling drops of water e.g. condensation.

IP First number – Protection against solid objects

0No special protection.
1Protected against solid objects over 50 mm, e.g. accidental touch by persons hands.
2Protected against solid objects over 12 mm, e.g. persons fingers.
3Protected against solid objects over 2.5 mm (tools and wires).
4Protected against solid objects over 1 mm (tools, wires, and small wires).
5Protected against dust limited ingress (no harmful deposit).
6Totally protected against dust.

 

IP Second number – Protection against liquids

0No protection.
2Protection against vertically falling drops of water e.g. condensation.
3Protection against direct sprays of water up to 15o from the vertical.
4Protection against water sprayed from all directions – limited ingress permitted.
5Protected against low pressure jets of water from all directions – limited ingress.
6Protected against temporary flooding of water, e.g. for use on ship decks – limited ingress permitted.
7Protected against the effect of immersion between 15 cm and 1 m.
8Protects against long periods of immersion under pressure.

 

Form Factors Explained

Form 1No separation.
Form 2aSeparation of the busbars from the functional units, with terminals for external conductors not separated from the busbars.
Form 2bSeparation of the busbars from the functional units, with terminals for external conductors separated from the busbars.
Form 3aSeparation of busbars from the functional units, and separation of all functional units from one another. Separation of the terminals, for external conductors, from the functional units, but not from each other. Terminals for external conductors not separated from busbars
Form 3bSeparation of busbars from the functional units, and separation of all functional units from one another. Separation of the terminals, for external conductors, from the functional units, but not from each other. Terminals for external conductors separated from busbars.
Form 4Separation of busbars from the functional units, and separation of all functional units from one another, including the terminals for external conductors which are an integral part of the functional unit.
Type 1Terminals for external conductors located in the same compartment as the associated functional unit. Busbar separation is achieved by insulated coverings, eg. Sleeving, wrapping or coatings. Cables may be glanded elsewhere.
Type 2Terminals for external conductors located in the same compartment as the associated functional unit. Busbar separation is achieved by metallic, or nonmetallic, rigid barriers, or partitions. Cables may be glanded elsewhere.
Type 3Terminals for external conductors located in the same compartment as the associated functional unit. Busbar separation is achieved by insulated coverings, eg. Sleeving, wrapping, or coatings. The termination for each functional unit has its own integral glanding facility.
Type 4Terminals for external conductors located in the same compartment as the associated functional unit, but in individual, separate, enclosed protected spaces, or compartments. Busbar separation is achieved by insulated coverings, eg. Sleeving, wrapping or coatings. Cables may be glanded elsewhere.
Type 5Terminals for external conductors located in the same compartment as the associated functional unit, but in individual, separate, enclosed protected spaces, or compartments. Busbar separation is achieved by metallic, or nonmetallic, rigid barriers, or partitions. Terminals may be separated by insulated coverings, and glanded in common cabling chambers.
Type 6Terminals for external conductors located in the same compartment as the associated functional unit, but in individual, separate, enclosed protected spaces, or compartments. All separation is by metallic or non-metallic, rigid barriers, or partitions. Cables are glanded in common cabling chamber.
Type 7Terminals for external conductors located in the same compartment as the associated functional unit, but in individual separate, enclosed protected spaces, or compartments. All separation is by metallic, or non-metallic, rigid barriers, or partitions. The termination for each functional unit has its own integral glanding facility.