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BS 7822-3:1995 Insulation coordination for equipment within low-voltage systems - Part 3. Use of coatings to achieve insulation coordination of printed board assemblies

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This part of IEC 664 applies to rigid printed board assemblies with an insulating coating applied to one or both sides of the printed board. Such coatings are used to provide insulation and to protect the microenvironment of the printed board assembly surface against pollution, for the purpose of insulation coordination. It describes the requirements and test procedures for printed board assemblies provided with coatings. This part covers two types of coatings: - type A coating only provides protection against pollution. The clearance and creepage distance requirements of IEC 664-1 apply to the printed board assembly under the coating; - type B coating provides protection against pollution and insulation. There are no requirements for clearances and creepage distances under the coating. Only the requirements of IEC 664-1 for solid insulation apply. NOTES 1. For type B coating, the conductors are embedded in solid insulation consisting of the base material and the coating. 2. Clearances and creepage distance requirements apply to all uncoated parts of the board and between conductive parts over the coating. The principles in this part are applicable to functional and basic insulation. Note 3- For supplementary and reinforced insulation, additional requirements, which are under consideration, may apply.
Contributor(s):
MAR - Data Entry Person
Primary Item Type:
British Standard
Identifiers:
ISBN 0580245543
ICS  29.080.01 Electrical insulation in general
Language:
English
Subject Keywords:
Stress; Design; Voltage; Temperature; Assembling; Performance; Electrical equipment; Visual inspection (testing); Environmental testing; Electrical insulating materials; Clearance distances; Printed-circuit boards; Coordination; Leakage paths; Coatings; Clearances; Pollution; Electrical insulation; Low-voltage equipment; Quality control; Grades (quality); Electrical conductivity; Electric conductors; Dimensions; Sampling methods
First presented to the public:
12/29/2022
Original Publication Date:
11/15/1995
Previously Published By:
British Standards Institution
Place Of Publication:
London, United Kingdom
Citation:
Extents:
Number of Pages - 16
License Grantor / Date Granted:
  / ( View License )
Date Deposited
2022-12-29 15:06:07.61
Date Last Updated
2022-12-29 15:37:57.146
Submitter:
Muhamad Azmil Ramli

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