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ISO7221CDRG4 Datasheet(PDF) 19 Page - Texas Instruments

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Part # ISO7221CDRG4
Description  DUAL DIGITAL ISOLATORS
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
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ISO7221CDRG4 Datasheet(HTML) 19 Page - Texas Instruments

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Insulation:
Pollution Degree:
Installation Category:
ISO7220A, ISO7220C, ISO7220M
ISO7221A, ISO7221C, ISO7221M
SLLS755F – JULY 2006 – REVISED AUGUST 2007
ISOLATION GLOSSARY (continued)
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 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.
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.
19
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