ELECTRICAL APPARATUS FOR USE IN ZONE 20, ZONE 21 AND ZONE 22 HAZARDOUS (CLASSIFIED) LOCATIONS - PROTECTION BY ENCAPSULATION "MD"

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

01-01-2006

Publisher

International Society of Automation

1 Scope
2 References
3 Terms and definitions
4 General
   4.1 Temperature classification
   4.2 Level of protection
   4.3 Level of protection "maD"
   4.4 Level of protection "mbD"
   4.5 Supply specifications
5 Requirements for compounds
   5.1 General
   5.2 Specification
6 Temperatures
   6.1 General
   6.2 Temperature limitation
   6.3 Determination of the limiting temperature values
7 Constructional requirements
   7.1 General
   7.2 Determination of possible faults
   7.3 Switching contacts
   7.4 External connections
   7.5 Protection of bare live parts
   7.6 Cells and batteries
   7.7 Protective devices
8 Type tests
   8.1 Tests on the compound - water absorption test
   8.2 Tests on the apparatus
9 Routine verifications and tests
   9.1 Visual inspections
   9.2 Dielectric strength test
10 Marking
Annex A (informative) Basic requirements for compounds for
                      encapsulation "mD" apparatus
Annex B (normative) Allocation of test samples
Annex C (normative) Test procedure during thermal cycling test
Annex D (Informative) United States major deviations

Applies to electrical apparatus protected by encapsulation type of protection "mD" and surface temperature limitation for use in areas where combustible dust may be present in quantities which could lead to a fire or explosion hazard. Also specifies requirements for design, construction and testing of electrical apparatus, parts of electrical apparatus and Ex components where the rated voltage does not exceed 10 kV.

Committee	SP12.10
DevelopmentNote	To be read in conjunction with ISA 61241-0. (10/2006)
DocumentType	Standard
Pages	44
PublisherName	International Society of Automation
Status	Current

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