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ISO7221C-HT Datasheet(PDF) 12 Page - Texas Instruments

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Part No. ISO7221C-HT
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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ISO7221C-HT Datasheet(HTML) 12 Page - Texas Instruments

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– APRIL 2011
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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© 2011, Texas Instruments Incorporated
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