IS 302-2-208: Safety of Household and Similar Electrical Appliances, Part 2: Particular Requirements, Section 208: Single Walled Baking Ovens

14 Pages·1994·1.4 MB·English

by  Bureau of Indian Standards

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IS 302-2-208 (1994): Safety of Household and Similar
Electrical Appliances, Part 2: Particular Requirements,
Section 208: Single Walled Baking Ovens [ETD 32: Electrical
Appliances]
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Indian Standard
SAFETYOFHOUSEHOLDANDSIMILAR
ELECTRTCALAPPLTANCES
PART 2 PARTICULAR REQUIREMENTS
Section 208 Single Walled Baking Ovens
UDC 64-06-83 : 641~535.3 : 614.895

0 BIS 1994
RUREAU OF INDIAN STANDARDS
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NE-W DELHI 110002
April 1994 Price Groop 4
Electrical Appliances Sectional Committee, ET 32
FOREWORD
This Indian Standard was adopted by the Bureau of Indian Standards, after the draft finalized by the
Electrical Appliances Sectional Committee had been approved by the Electrotechnical Division Council.
This Indian Standard covers the general and safety requirements of single walled baking ovens. This
standard does not cover the performance requirem nts. which are covered under a separate standard
IS 8985 : 1978 Specification for single walled baking ovens’.
This standard is to be read in conjunction with IS 302-l ( 1979 ) Safety of household and similar electrical
appliances : Part 1 General requirements’. For the sake of convenience, the clauses of this standard corres-
pond to those of IS 302-l ( 1979 ), instead of reproducing full text of each clause. Clauses of IS 302-l
( 1979 ) which are applicable ( which means that relevant provisions of the clause apply ) or not applicable
and the sub-clauses or portions thereof which are not applicable are indicated as under:
a) In case of a clause where it is applicable or not applicable, the wording used is (This clause of
IS 302-l ( 1979 ) is applicable/not applicable’.
G) In case of sub-clause or part thereof ‘Not applicable’.
Wherever a sub-clause of IS 302-l ( 1979 ) is to be replaced by a new text, it has been indicated as
under:
‘Replacement - followed by the next text.’
Any addition to the existing provisions of a sub-clause of IS 302-l ( 1979 ) has been indicated as under:
&Addition - followed by the text of the additional matter.’
Clauses/tables which are additional to those of IS IS 302-l ( 1978 ) are numbered starting from 101 and
additional sub-clauses are numbered with the main clause number followed by 101, IO2 etc, for example,
7.101.
Should however, any deviation exist between IS 302-l ( 1979 ) and this standard, the provisions of the
latter shall apply.
While preparing this standard, assistance has been derived from the following publications issued by the
International Electrotechnical Commission:
IEC Pub 335-l ( 1976 ) Safety of household and similar electrical appliances : Part 1 General
requirements
IEC Pub 335-2-6 ( 1986 ) Safet y of household and similar electrical appliances : Part 2 Particular
requirements for cooking ranges, cooking tables, ovens and similar appliances for household use.
The Indian Standard which are necessary adjuncts to this standard are given in Annex AA,
For the purpose of deciding whether a particular requirement of this standard is complied with, the final
value, observed or calculated, expressing the result of a test or analysis, shall be rounded off m accordance
with IS 2 : 1960 ‘Rules for rounding off numerical values ( revised )‘. The number of significant places
retained in the rounded off value should be the same as that of the specified value in this standard,
AMENDMENT NO. 1 APRIL 2002
TO
IS 302-2-208 : 1994 SAFETY OF HOUSEHOLD AND
SIMILAR ELECTRICAL APPLIANCES
PART 2 PARTICULAR REQUIREMENTS
Section 208 Single Walled Baking Ovens
(Page 4, clause 101.1,. lines 2, 3 and 4) - Substitute 'a sample' for 'two
samples of Single Walled Baking Ovens of the same type and rating'.
(Page 5, clause 101.1.1, line 1) - Substitute 'Sample' for 'Both samples'.
(ETD 32)

Reprography Unit, BIS, New Delhi, India
IS 302-2-208 : 1994
Indian Standard
SAFETYOFHOUSEHOLDANDSIMILAR
LACIRTCELE SECNAILPPA
PART 2 PARTICULAR REQUIREMENTS
Section 208 Single Walled Baking Ovens
1 SCOPE 2.103 Automatic Oven
This clause of 1S 302-l ( 1979 ) is applicable An oven which is thermostatically controlled.
except as follows:
2.104 Non-automatic Oven
1 .l Replacement
An oven which is not thermostatically controlled.
This standard covers general and safety require- It may however be provided with a thermal cut-
ments for Single Walled Baking Ovens for baking out.
and grilling designed for household use, their
rated voltage not exceeding 230 volts ac single 2.105 Temperature of Oven
phase or dc.
The temperature anywhere in the central position
1.2 Replacement of baking space, the space being the cube of 5 cm
around the geometric centre of oven.
This standard does not apply to:
2.106 Baking Space
- Double walled cooking ovens and other
ovens which are covered by IS 302-2-6 The space within an oven which is above the
( 1993 ). lowest position of baking oven and not less than
For appliances intended to be used in vehicles or 5 cm from heating surface.
on board ships or aircraft, additional requirements
2.107 Oven Grill
may be necessary.
An oven which is provided with a grilling arrange-
2 TERMINOLOGY
ment with a heating element fixed near the top of
2.1 This clause of IS 302-l ( 1979 ) is applicable the baking space.
except as follows:
3 GENERAL RE~QUIREMENT
2.29 Replacement
This clause of IS 302-I ( 1979 ) is applicable:
Conditions of Adequate Heat -Discharge - except as follows:
The load that apply when a heat in g appliance is
operated under normal conditions of use. Baking 3.1 Para 2 Not applicable.

ovens and other similar appliances for baking
4 GENERAL NOTES ON TESTS
and grilling are operated so that the temperature
at centre of heater surface is maintained at 250 f This clause of IS 302-l ( 1979 ) is applicable
15”C, either by means of a thermostat or by except as follows:
switching the supply ‘on’ and ‘off’. If the thermo-
4.8, 4.10, 4.13 and 4.14 not applicable.
stat does not allow temperature to reach 25O”C,
the appliance is operated with the thermostat at 5 RATING
the highest setting.
This clause of IS 302- 1 ( 1979 ) is applicable
Additional Sub-clauses
except as follows:
2.101 Baking Pan
5.2 Replacement
_A sheet or tray which can be withdrawn and on
-which food items, such as cake, biscuits can be The rated input shall not exceed 2.0 kW.
baked. 6 CLASSIFICATION
2.102 Oven This clause of IS 302-I ( 1979 ) is applicable
A chamber which can be closed, and incorpora- except as follows:
tes heating units intended for heating the
7 MARKING
chamber, in which baking and/or grilling is
carried out. This clause of IS 302-l ( 1979 ) is applicable.
1
IS 302-2-208 : 1994
7.101 Every oven shall be marked indelibly and 12 OPERATLON UNDER OVERLOAD
clearly in accordance with 27.1 of IS 302-l (1979) CONDITIONS OF APPLIANCES WITH
on its outer surface or on a nameplate firmly HEATING ELEMENTS
attached to it. A clear marking indicating the
This clause of IS 302-l ( 1979 ) is applicable
different switch positions and correspond rating
except as follows:
in watts shall be provided where multi-top
switches are provided. In addition to above a 12.3 Not applicable.
marking stating whether the oven is insulation
‘0-I” uninsulated type shall be there. 13 ELECTRICAL INSULATION AND
LEAKAGE CURRENT AT OPERATING
7~162 Every oven shall be supplied with the TEMPERATURE
necessary instructions booklet including precau-
This clause of IS 302-l ( 1979 ) is applicable.
tions to be taken for its proper use. The instruction
shall describe in detail the manner of carrying
14 RADIO AND TELEVISION
out the va.rious baking operations which are
INTERFERENCE SUPPRESSION
possible with the Dven and shall in particular
indicate the best position in the oven for different This clause of IS 302-l ( 1979 ) is applicable.
types of baking, type of vessel to be used, clearn-
ing instruction and the appropriate thermostat 15 MOISTURE RESESTANCE
setting for various baking operation where a
This clause of IS 302-I ( 1979 ) is applicable
thermostat is provided.
except as follows:
7.103 The single walled baking ovens may also 15.1 Not applicable.
be marked with the Standard Mark.
15.2 Addition
7.103.1 The use of the Standard Mark is governed Ordinarv and drip-proof appliances are also
by the provisions of Bureau of Indian Standards subjected to the splash test with the apparatus
Act, 1986 and the Rules and Regulations made shown in Fig. 11 of IS 302- 1 ( 1979 ).
thereunder. The details of conditions under which
the licence for the use of Standard Mark may be 15.4 Replacement
granted to manufacturers or producers may be
Instead of the periods specified, the following
obtained from the Bureau of Indian Standards.
applies:
8 PROTECTION AGAINST ELECTRIC Appliances are placed in the humidity cabinet for
SHOCK a period of 48 h.
This clause of IS 302-l ( 1979 ) is applicable. Addition
8.2, 8.3 and 8.7 Not applicable. If it is not possible to place the whole appliance

in the humidity cabinet, parts containing electrical

9 STARTING OF MOTOR-OPERATING components are tested separately, taking into
APPLIANCES account the conditions which occur in the appli-
ance.
This clause of IS 302-l ( 1979 ) is not applicable.
16 INSULATION RESISTANCE AND
18 INPUT AND CURRENT ELECTRIC SHOCK STRENGTH ( AFTER
HUMIDITY TREATMENT )
This clause of Part 1 is applicable.
This clause of IS 302-l ( 1979 ) is applicable
18.2 Not applicable. except as follows:
11 TEMPERATURE RISE 16.3 Not applicable.
This clause of IS 302-l ( 1979 ) is applicable. 17 OVERLOAD PROTECTION
11.5 and 11.6 Not applicable. This clause of IS 302-l ( 1979 ) is applicable.
11.8 Replacement 18 ENDURANCE
The temperature rise of handle, knobs and grips ( Under Consideration ) .
and the like which, in normal use, are held for
short periods and are made of moulded material 19 ABNORMAL OPERATION
shall not exceed 55°C.
This clause of IS 302-l ( 1979 ) is applicable
11.9 and 11.10 Not applicable except as follows:
2
IS 302-2-208 : 1994
19.1 Replacement Additional Sub-clauses
Appliances shall be so designed that the risk of 22.101 Heating Chamber
fire, mechanical damage impairing safety or the
The interior of the oven lining, sheet metal oven
protection against electric shock as a result of
runners and baffles, drip-trays, and the inner
abnormal or careless operation is obviated as far
panel of the oven door when made out of mild
as is practicable.
steel, shall be finished in vitreous enamel having
Compliance is checked by the tests of 19.2 resistance to thermal shock and heat such that it
ot 19.4. shall comply with the requirements laid down in
IS 3972 : 1968. These may also be made of
If, in any of the tests, a non-self-resetting thermal commercial purity aluminium ( see IS 737 : 1986 )
cut-out operates, a heating element ruptures or if in half hard condition duly anodized or stainless
the current is otherwise interrupted before steady steel or any other suitable material or finish.
conditions are established, the heating period is
considered to be ended, but if the interruption is The heating chamber shall be so constructed and
due to the rupture of a heating element or of an reinforced that baking pan is adequately supported
intentionally weak part, the relevant test is and the material of heating chamber does not
repeated on a second sample which shall then warp buckle when heated to maximum tempera-
also comply with the conditions specified in 19.11. ture of oven.
Rupture of heating element or of an intentionally Interior surfaces of the oven should be such that
weak part in the second sample will not in itself they lend themselves for early and thorough
entail a rejection.
cleaning even after continuous use.
Fuses, thermal cut-outs, overcurrent releases or
Interior surfaces of the baking oven should be
the like incorporated into the appliance, may be
such that they lend themselves for early and
used to provide the necessary protection.
thorough cleaning even after continuous use.
If more than one of the tests are applicable for
The ovens shall be provided with the suitable
the same appliance, these tests are made consc-
viewing arrangement.
cutivelv.
22.102 stnev
Provisions of 19.11 apply to all appliances.
One or more suitable vents shall be provided near
20 STABILITY AND MECHANICAL top of even, so arranged that they deflect fumes
HAZARDS and moisture away.
This clause of IS 302-l ( 1979 ) is applicable 22.103 Baking Pan and Tray
except as follows:
Every oven shall be supplied with at least one
20.1 ~Addition tray. The baking pan and tray shall be made of
aluminium or any other suitable material taking
Covers, lids and accessories are placed in the most into consideration that it does not warp on hear-

unfavourable positions. ing.

20.2 Not applicable. 22.104 Heating Element
The heating element shall be so designed and
21 MECHANICAL STRENGTH
located that the heating condition required for
baking can be obtained and local over-heating
This clause of IS 302-l ( 1979 ) is applicable.
or burning of the foodstuffs avoided. Use of
21.2 to 21.4 Not applicable. mineral filled sheathed heating elements conform-
ing to IS 4159 : 1983 is recommended. However,
22 CONSTRUCTION if bare heating coils supported in a tubing is used,
steatite ceramic shall be used for supporting the
This clause of IS 302-l ( 1979 ) is applicable heating coil.
except as follows:
22.105 Wiring and Components
22.1 Replacement
The wiring and all the components used in an
Appliances shall be of Class I construction. oven shall be constructed and fixed in such a
manner that they shall be able to withstand
Compliance is checked by inspection and by the continuously the temperature to which they are
relevant tests. exposed when the oven is operated at its maxi-
mum temperature. All the wiring and components
22.15, 22.18, 22.20, 22.24, 22.25, 22.29 and 22.m32 shall be suitable protected from spillage or over-
Not -applicable. flow from vessels in the oven.
a
IS 302-2-208 : 1994
22.106 Thermostats flexible cable not lighter than ordinary polychloro-
prene or other equivalent synthetic elastomer-
Where a thermostat is used it shall comply with sheated cord [ see IS 9968 ( Part 1 ) : l988 1.
IS 4165 : 1991. An indicator shall be provided to
give an indication when the contacts of ther- 25;6 Addition
mostat have a voltage and current rating not less The length of the supply cord measured between
than the heating element it controls.
the entry point into the appliance and the entry
22.107 Handles point into the plug and cord guard included,
shall be not less than 2.0 m if supplied with plug,
The oven shall be provided with handles of or shall be not less than 2~05m if supplied without
adequate size so that possibility of touching the
plug.
body while handling the oven is avoided. The
handles shall be made of heat insulating material 25.10 Not applicable.
for safe handling of the oven,
26 TERMINALS FOR EXTERNAL
22.108 Switches CONDUCTORS
Manually operated switches if used in an oven This clause of IS 302-l ( 1979 ) is applicable.
shall comply with the relevant provisions of
IS 3854 : 1988. Switches and controls shall be 27 PROVISION FOR EARTHING
located or protected so that they are not subjected
to mechanical injury, spillage from baking or This clause of IS 302-l ( 1979 ) is applicable
collection of grease. except as follows:
22.109 Heat Control 272 Addition
Oven heating elements of 750 watts and over Small fixed exposed metal parts, for example
shall be controlled by a switch having not less name plates and the like, are not required to be
than three heat steps, by an energy regulator, or in electrical contact with the terminal.
by a thermostat. A non-automatic oven shall be
provided with a temperature indicator. In case of 28 SCREWS AND CONNECTIONS
grill type of ovens provisions for separate switch-
This clause of IS 302-l ( 1979 ) is applicable.
ing arrangement of the grilling element.
30 RESISTANCE TO HEAT, FIRE AND
23 INTERNAL WIRING
TRACKING
This clause of IS 302-l ( 1979 ) is applicable.
This clause of IS 302-l ( 1979 ) is applicable.
24 COMPONENTS
31 RESISTANCE TO RUSTING
This clause of IS 302-l (1979 ) is applicable
This clause of IS 302-l ( 1979 ) is applicable.
except as follows:

24.9 and 24.10 Not applicable. 32 RADIATION HAZARDS
This clause of IS 302-l ( 1979 ) is applicable.
24.11 -Replacement
101 TESTS
Thermal cut-outs shall provide all phase discon-
nection from the supply.
101.1 Type Test
Compliance is checked by inspection.
The tests specified in Table 101 shall constitute
the type tests and shall be carried out on two
25 SUPPLY CONNECTION AND EXTERNAL
samples of Single Walled Baking Ovens of the
FLEXIBLE CABLES AND CORDS
same type and rating selected preferably at ran-
dom from a regular production lot. Before com-
This clause of IS 302-l ( 1979 ) is applicable.
mencement of the test, the steam cookers shall be
25.4 Addition visually examined and inspected for obvious visual
defects in respect of components, parts and their
Type X attachment shall be used for appliances
assembly, construction, mechanical hazards,
delivered without a cord,
markings, -provision of suitable terminals for
~25.6 Replacement supply connections, earthing and the effectiveness
of screws and connections. The external surface
Instead of the types of power supply cord speci- finish shall be even and free from finishing
fied, the following applies: defects.
Power supply cords shall be oil resistant sheathed NOTE - See also 4.2.
4