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What are additional letters in IP code?
The additional letters ABCD from IP coding are for the verification of protection of low-voltage equipment against access to hazardous parts.
When will additional letters be used?
Additional letters are only used
– if the actual protection against access to hazardous parts is higher than that indicated by the first characteristic numeral
– or if only the protection against access to hazardous parts is indicated, the first characteristic numeral being then replaced by an X.
For example, such higher protection may be provided by barriers, suitable shape of openings or distances inside the enclosure.
An enclosure shall only be designated with a stated degree of protection indicated by the additional letter if the enclosure also complies with all lower degrees of protection. However,the tests establishing compliance with any one of the lower degrees of protection need not necessarily be carried out provided that these tests obviously would be met if applied.
Degrees of protection against access to hazardous parts indicated by the additional letter
Additional letter | Brief description | Definition | Acceptance conditions |
A | Protected against access with the back of the hand | The access probe, sphere of 50 mm diameter , Shall have adequate clearance from hazardous parts | The protection is satisfactory if adequate clearance is kept between the access probe and hazardous parts. |
B | Protected against access with a finger | The jointed test finger of 12 mm diameter, 80 mm length, shall have adequate clearance form hazardous parts | The jointed test finger may penetrate to its 80 mm length, but the stop face (Ø 50 mmx20 mm) shall not pass through the opening. Starting from the straight position, both joints of the test finger shall be successively bent through an angle of up to 90° with respect to the axis of the adjoining section of the finger and shall be placed in every possible position. |
C | Protected against access with a tool | The access probe of 2.5 mm diameter, 100 mm length, shall have adequate clearance from hazardous parts | The access probe may penetrate to its full length, but the stop face shall not fully penetrate through the opening. |
D | Protected against access with a wire | The access probe of 1.0 mm diameter, 100 mm length, shall have adequate clearance from hazardous parts | The access probe may penetrate to its full length, but the stop face shall not fully penetrate through the opening. |
Access probes for additional letter ABCD
Access probes are considered by convention as representative of parts of the
human body or objects held by a person and the definitions for the degrees of protection
against access to hazardous parts, indicated by additional letters.
Basically, the access probes
IP1X access probe=Test probe A(Back of hand)
IP2X access probe=Test probe B(Finger)
IP3X test rod= Test probe C(Tool)
IP3X test wire =Test probe D(Wire)
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