ingress protection |
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Another important consideration in the selection of electrical equipment is the extent to which the equipment protects against the ingress of solids and liquids.
For example where the equipment is to be used in dusty, dirty or wet conditions it is important to know how well it resists the ingress of dust and water. In some cases the method of explosion protection takes account of ingress protection.
In some cases the method of explosion protection takes account of ingress protection.
The degree of protection against the intrusion of solid and liquid particles into the electrical equipment is designated as the Ingress Protection or IP rating. An IP rating has two digits, digit "x" and digit "y" associated with it.
An IP rating is expressed in the form IP"x""y". Digit "x" represents the degree of protection against the ingress of solids. The digit "y" represents the protection provided against the ingress of liquids. The degrees of protection associated with digits "x" and "y" for solids and liquids respectively are provided in the following table.
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Degree
of protection against ingress of solids |
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Digit "x" |
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Protection
against ingress of liquids |
Digit "y" |
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| No
protection |
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0 |
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No
protection |
0 |
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Protected
against large solid objects up to 50mm (eg
hands) |
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1 |
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Protected
against vertically falling drops of water |
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1 |
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Protected
against small solid objects up to 12.5 mm (eg
fingers) |
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2 |
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Protection
against drops of liquid falling at an angle
up to 15 from vertical |
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2 |
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Protected
against solid objects up to 2.5 mm (eg tools) |
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3 |
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Protection
against rain falling at any angle up to 60
from vertical |
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3 |
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Protected
against solid objects up to 1 mm (eg wires) |
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4 |
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Protection
against splashing from all directions |
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4 |
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Protected
against ingress of dust in an amount sufficient
to interfere with the satisfactory operation
of the equipment |
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5 |
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Protection
against water jets from any direction |
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5 |
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Totally
protected against the ingress of dust |
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6 |
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Protection
against strong water jets from all direction |
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6 |
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Protected
against immersion between 15 mm and 1 m in
depth |
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7 |
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Protected
against lengthy immersion under pressure |
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8 |
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« ATEX directives |
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