ISO7221C-HT datasheet(12/16 Pages) TI1

12 / 16 page

ISO7221C-HT

SLLSE78

– APRIL 2011

www.ti.com

Insulation:

Operational insulation

— Insulation needed for the correct operation of the equipment.

Basic insulation

— Insulation to provide basic protection against electric shock.

Supplementary insulation

— Independent insulation applied in addition to basic insulation in order to ensure

protection against electric shock in the event of a failure of the basic insulation.

Double insulation

— Insulation comprising both basic and supplementary insulation.

Reinforced insulation

— A single insulation system which provides a degree of protection against electric shock

equivalent to double insulation.

Pollution Degree:

Pollution Degree 1

— No pollution, or only dry, nonconductive pollution occurs. The pollution has no influence.

Pollution Degree 2

— Normally, only nonconductive pollution occurs. However, a temporary conductivity caused

by condensation must be expected.

Pollution Degree 3

— Conductive pollution occurs or dry nonconductive pollution occurs which becomes

conductive due to condensation which is to be expected.

Pollution Degree 4

– Continuous conductivity occurs due to conductive dust, rain, or other wet conditions.

Installation Category:

Overvoltage Category

— This section is directed at insulation co-ordination by identifying the transient

overvoltages which may occur, and by assigning 4 different levels as indicated in IEC 60664.

I: Signal Level

— Special equipment or parts of equipment.

II: Local Level

— Portable equipment etc.

III: Distribution Level

— Fixed installation

IV: Primary Supply Level

— Overhead lines, cable systems

Each category should be subject to smaller transients than the category above.

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