IS 302 : Part 2 : Sec 21 : 2024/IEC 60335-2-21 : 2022 Household and Similar Electrical Appliances - Safety - Part 2 Particular Requirements - Section 21 Storage Water Heaters

ICS 13.120; 91.140.65

ETD 32

NATIONAL FOREWORD

This Indian Standard (Part 2/Section 21) (Third Revision) which is identical to IEC 60335-2-21 : 2022 'Household and similar electrical appliances - Safety - Part 2-21: Particular requirements for storage water heaters' issued by the International Electrotechnical Commission (IEC) was adopted by the Bureau of Indian Standards on the recommendation of the Electrical Appliances Sectional Committee and approval of the Electrotechnical Division Council.

This standard was first published in 1992 and revised in 2011, 2018. This revision has been brought out to harmonize with the latest version of IEC 60335-2-21.

This standard covers the safety requirements of storage water heaters. This standard does not cover the performance requirements, which are covered under a separate standard (see IS 2082 'Stationary storage type electric water heaters').

This Part 2 is to be used in conjunction with IS 302 (Part 1) : 2024 'Household and similar electrical appliances - Safety: Part 1 General requirements (seventh revision)'.

NOTE - When 'Part 1' is mentioned in this standard, it refers to IS 302 (Part 1).

This standard supplements or modifies the corresponding clauses in IS 302 (Part 1), so as to convert that publication into the Indian standard: Safety requirements for storage water heaters.

When a particular sub clause of Part 1 is not mentioned in this Part 2, that subclause applies as far as is reasonable. When this standard states 'addition', 'modification' or 'replacement', the relevant text in Part 1 is to be adapted accordingly.

NOTES

1 The following numbering system is used:

a) Subclauses, tables and figures that are numbered starting from 101 are additional to those in Part 1;

b) Unless notes are in a new subclause or involve notes in Part 1, they are numbered starting from 101, including those in a replaced clause or subclause; and

c) Additional annexes are lettered AA, BB, etc.

2 The following print types are used:

a) Requirements: in roman type;

b) Test specifications: in italic type; and

c) Notes: in small roman type.

Should however, any deviation exist between IS 302 (Part 1) : 2024 and this standard, the provisions of the latter shall apply.

This revision includes the following significant technical changes with respect to the previous version (minor changes are not listed):

a) Addition of direct current (DC) supplied appliances and battery-operated appliances (1);

b) Some notes have been converted to normative text (1, 5.2, 15.3, 19.1, 19.2, 19.3, 19.4, 22.47, 22.104, Annex AA introduction);

c) Addition of the temperature rises of external accessible surfaces (11.3, Table 101);

d) Introduction of a new 12 charging of metal-ion batteries;

e) Clarified that a drain hole needs to meet the minimum dimensions or it is considered to be blocked when determining compliance (22.6);

f) Addition of construction requirements for open-outlet water heaters having plastic containers (22.110);

g) Modification in construction requirements of water heaters (22.111);

h) Updated requirement restricting use of appliance inlets (25.1);

j) Figure of probe for measuring surface temperatures added; and

k) Modification in contents of Annex R and Annex AA.

The text of IEC standard has been approved as suitable for publication as an Indian Standard without deviations. Certain terminologies and conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:

a) Wherever the words 'International Standard' appear referring to this standard, they should be read as 'Indian Standard'; and

b) Comma (,) has been used as a decimal marker, while in Indian Standards the current practice is to use a point (.) as the decimal marker.