How Marine Electrical Equipments are Rated for Ingress Protection

by OldSailor on March 17, 2008

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Here are some commonly seen electrical equipment in the ships. All these equipments are complying to some IP Rating. Closely look at the circled text.

mcp

light_fitting

Here is a Pressure Switch, having Enclosure Protection: IP 66

RTP-Large

What is IP Rating ?

IP stands for Ingress Protection. Ingress Protection rating given by the manufacturer implies how well is the equipment protected from intrusion of solids and water while working or in switched off condition. IP rating is denoted with two digits. The first digit (zero to six) indicates the degree of protection against solids. The second digit (zero to eight) indicates the degree of protection against water.

ip_rating

First Digit (zero to six) is for indicating protection against solids

Digit Level of protection against solids
0 No protection provided
1 Protected against solids greater than 50 mm dia
2 Protected against solids greater than 12 mm dia
3 Protected against solids greater than 2.5 mm dia
4 Protected against solids greater than 1 mm dia
5 Dust Protected
6 Dust Tight

Note: Higher the value of the numeral, higher the degree of protection.

Second Digit (zero to eight) is for indicating protection against water

Digit Level of protection against water
0 No protection provided
1 Protected against dripping water
2 Protected against dripping water when tilted up to 15 degree
3 Protected against water spray
4 Protected against splashing water
5 Protected against water jets
6 Protected against heavy seas
7 Protected against the effects of immersion up to 1 metre
8 Protected against submersion

Note: Higher the value of the numeral, higher the degree of protection.

Generally equipments used for marine applications are rated to IP 56 or higher degree of protection depending on the application.

If you need any clarification, feel free to contact OldSailor.

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