Page 98 - Louth Transformer Catalogue

LT TRANSFORMER ENCLOSURES

IP RATINGS EXPLAINED

International Standard IEC 60529 uses IP ratings to classify the level of protection provided by electrical appliances
to the ingress of solid objects, dust, accidental contact and water. The first digit indicates the level of protection
provided against solid foreign objects while the second digit indicates the level of protection against water.

IP XX

LEVEL PROTECTED AGAINST LEVEL PROTECTED AGAINST

No protection against contact & ingress 0 --------------------------
0
of objects.
Dripping water (vertically falling drops)
1 shall have no harmful effect.
Any large surface of the body, such as the
1
back of a hand.
Vertically dripping water shall have no
2 harmful effects when the enclosure is
tilted up to 15° from its normal position.
2 Fingers or similar objects. Water falling as a spray at any angle up
3 to 60° from vertical shall have no harmful
effect.
Water splashing against the enclosure
3 Tools, thick wires etc. 4 from any direction shall have no harmful
effect.
Water projected by a nozzle against the
5 enclosure from any direction shall have no
4 Most wires, screws etc. harmful effect.
Water from heavy seas or projected in
6 powerful jets shall not enter the enclosure
Ingress of dust is not entirely prevented, in harmful quantity.
however it must not enter in sufficient
5
quantity to interfere with the operation of Ingress of water in harmful quantities shall
the equipment. 7 not be possible when immersed in water
up to 1m deep.
6 No ingress of dust. The equipment is suitable for continuous
8 immersion in water under conditions
specified by the manufacturer.

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