A-40
Engineering Guide CDA3000
Appendix A Formula bank
A.3 Protection
A.3.1 Protection to
IEC/EN
Protection against touch and foreign body contact
First
code
digit
Scope of protection
Designation Explanation
0 No protection
No special protection of personnel against random touch contact
with live or moving parts.
No protection of equipment against intrusion of solid foreign
bodies.
1
Protection
against for-
eign bodies
>
50 mm
Protection against random large-area touch contact with live parts
and internal moving parts, e.g. with back of hand, but no protec-
tion against intentional accessing of said parts.
Protected against solid foreign bodies with a diameter of 50 mm
and larger.
2
Protection
against for-
eign bodies
>
50 mm
Protection against touch contact by fingers with live parts or inter-
nal moving parts.
Protected against solid foreign bodies with a diameter of 12.5 mm
and larger.
3
Protection
against for-
eign bodies
>
2.5 mm
Protection against touch contact with live parts or internal moving
parts by tools, wires or similar items of a thickness of 2.5 mm and
thicker.
Protected against solid foreign bodies with a diameter of 2.5 mm
and larger.
4
Protection
against for-
eign bodies
>
1 mm
Protection against touch contact with live parts or internal moving
parts by tools, wires or similar items of a thickness of 1 mm and
thicker.
Protected against solid foreign bodies with a diameter of 1 mm and
larger.
5
Protection
against dust
deposits
Complete protection against touch contact with live parts or inter-
nal moving parts.
Protection against damaging dust deposits. The intrusion of dust is
not entirely prevented, but the dust must not penetrate to the
extent that operation or safety is impaired.
6
Protection
against dust
intrusion
Dust-proof
Complete protection against touch contact with live parts or inter-
nal moving parts.
Protection against intrusion of dust.
Table 1.3 Protection against touch and foreign body contact
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