EE-RM-90-201 COMMENT OOR4

Addenda to American National Standard 

Z21.1-1974 

Z21.1a-1974 

for 

HOUSEHOLD COOKING 

GAS APPLIANCES 

Approved 

February 13, 1976 

AMERICAN NATIONAL 

STANDARDS INSTITUTE, INC. 

Secretariat 

AMERICAN GAS ASSOCIATION 

Boulevard 

Arlington, Va. 22209 
EE-RM-90-201 COMMENT OOR4

The standards set forth herein to the twentieth edition of American 

National Standard for Household Cooking Gas Appliances, Z21. and 

Addenda thereto, and supersede corresponding standards therein . 

.. u ..... ,a .. J:: their preparation the supervising subcommittee, were accepted 

by American National Standards Committee Z21 and subsequently approved as 

American National Standard the American National Standards Inc. 

© American Gas Association 

rei:)ldJlli~;b material herein in laws or Ordil!arICE~S 

or similar documents .. "", .... ""' .. other 

8501 

in U.S.A. 
EE-RM-90-201 COMMENT OOR4

Addenda to 

I 

CONSTRUCTION 

1.23 ELECTRICAL EQUIPMENT AND 

WIRING 

1.23.24 Adequate dielectric shaH be interposed 

between ungrounded current-carrying parts and 

those external surfaces which can be contacted. 

Method of Test 

When connected to a supply circuit of rated 

voltage and frequency, the appliance shall be operated under Test Condition 1 in Table X in accordance with the procedure specified in 2.22 or 

2.26.7, whichever is applicable. 

At the conclusion of the operating period specified, and with continued application of rated voltage 

and frequency, leakage current between each of 

the supply terminals and all noncurrent-carrying 

metal parts (ungrounded) which might become 

1 

energized shall be measured using the instrumentation as specified in American National Standard for 

Leakage Current for Appliances, C10l.l-1973. The 

leakage current shall not exceed 0.5 milliampere. 

Immediately after measurement of the leakage 

current, the electrical circuit of the appliance 

shall be subjected to a GO-cycle alternating test 

in quadrature with the supply voltage 

applied between current-carrying parts and noncurrent-carrying metal parts which might become 

energized. Starting at not more than twice rated 

voltage, the test potential shall be increased 

to 900 rms volts and maintained at that value for 

a period of 1 minute. 

The arrangement of the test circuit shall be 

such that if the dielectric material breaks down 

a positive signal will be obtained, rather than 

depending upon a visual inspection of the material. 
EE-RM-90-201 

----------------

COMMENT OOR4

.......... 

2.5 COMBUSTION 

2.5.1 A household cooking appliance shaH not 

produce a concentration of carbon monoxide in 

excess of 0.01 percent in a room of 1,000 cubic 

feet content with 4 air changes occurring during 

the combustion of an amount of gas liberating 

60,000 Btu. 

combustion tests of a unit, aU 

cracks or other openings (other than designed air 

openings) shaH be sealed. At the conclusion of 

the combustion tests, the sealing means shall be 

removed. 

Method of Test 

Burners shall be 

Thermostats shall be set at 

""", .. .,'VH after have been 

in 2.3.5. 

for carbon monoxide shall be on an airCarbon monoxide concentration in a 

cubic foot room shall be calculated the 

formula*; 

60 

where 

C concentration of CO inroom 

v 

e '= 

* This formula 

%, 

CO in air-free of 

%, 

inches in diameter 

water at 

!.no,,",,,'u over each 

hood shall then 

and broiler burners 

sections, if 

be in 

burners and 

be Simplified to read: Cr 0.0147 Ca V. 

during the time the samples of flue gases from the 

top burners are being secured. After the top burners 

have been in operation for 5 minutes under Test 

Conditions 2 and 3 in Table X, samples of the flue 

gases shall be secured from the hood vent and 

analyzed for carbon monoxide and carbon dioxide. 

b. An additional test under Test Condition 3 in 

Table X shall be conducted on top burners. During 

this test, other burners shall not be in operation. 

On units for use with natural, manufactured and 

mixed gases, or natural and mixed gases, this 

test need be conducted with test Gas A only. 

Two adjacent burners shall be covered with 

cast-iron 9-1/2 inches in diameter 

the recessed 3/16 inch with approxia 1/8-inch-wide 

a burner having an 

hour or more is 

covered the 

ameter 

on each 

After the 

5 minutes, 

Additional tests shall be conducted deemed 

necessary with the other combinations any two u", .• u.",-",~ 
EE-RM-90-201 COMMENT OOR4

c. When the 

that can be 

er flames to 

burner tests 

that 

d. An open top broiler unit shall be tested with 

the grid uncovered, and with the effective 

area covered with a sheet-metal panel. 

each test a suitably designed test hood of 

size to collect the products of combustion shall be 

placed on the cooking top. With the unit operating 

under Test Conditions 2 and 3 in Table X, samples 

of the flue gases shall be secured from the hood 

vent and analyzed for carbon monoxide and carbon 

dioxide after the burner(s) has been in operation 

for 5 minutes. 

e. An additional test shall be conducted on an 

broiler unit when under Test 

in Table X. On a for use with 

manufactured and mixed gases, or natural 

and mixed gases this test need be conducted with 

test Gas A top broiler unit shall be 

covered with a flat panel of a size 

that will cover the top to the outer edges of the 

of the unit. A suitably designed test hood of 

size to collect the of combustion 

shall be on the After the burner 

has been in for , a 

of the flue gases shall be secured from the hood 

vent and analyzed for carbon monoxide and carbon 

dioxide. 

f. An oven or enclosed broiler unit shall be 

operated for 5 minutes under Test Conditions 2 and 

3 in Table X, after which samples of the flue 

gases shall be secured from the flue outlet and 

analyzed for carbon monoxide and carbon dioxide. 

In the case of a unit having the top burner at 

a lower elevation than the oven and broiler burners, 

such top burners shall be placed in operation simultaneously with the oven and broiler burners and 

shall be operated during the time the oven and 

broiler samples are being secured. 

the flue gases from two oven or broiler 

assembled within the same are 

separate flues, they shall be 

h. All sections of a floor-mounted unit 

flue collar and which does not 

a built-in or attached draft 

shall for 15 minutes under 

Table X with the flue collar 

3 

outlet blocked. On a uni 1: for use with 

manufactured and mixed or natural and 

gases this test need be conducted with test 

Gas A of the shall be secured 

from each section to vent the 

flue collar and carbon and 

carbon dioxide. 

2.6 BURNER AND PILOT' OPERATING 

CHARACTERISTICS 

2.6.9 If oven and broiler burners are incorporated as part of the appliance, their operation 

shaH not cause top burner flames to show objectionable lifting, floating, or blowing, or be otherwise 

adversely affected. 

Method of Test 

This test shall be conducted under Test Conditions 1 2 and 3 in Table X. On an for 

use manufactured and gases, 

or natural and gase s, this test need be conducted with test Gas A 

The gas to oven burners and broiler 

burners shall be turned on and after which 

the gas to burners shall be turned on and 

and made ofth e top burner flames. This 

test shall be conducted for a 15-minute 

without utensils placed over the burner. 

2.6.11 Pilot and bypass flames of thermostatically controlled top burners shaH not be extinguished, or shall reignite in accordance with 

2.6.15, after having been subjected to a wind with 

a velocity of 3 miles per hour directed from the 

front, sides and intermediate points at an angle 

30 degrees down from the horizontal and also 

from the horizontal. 

Method of Test 

This test shall be conducted under Test Condition 1 in Table X. On a unit for use with natural, 

manufactured and mixed gases, or natural and 

mixed gases, this test need be conducted with test 

Gas A only. 

rate on the burner shall be obtained 

as in 2.6.5. This test shall be conducted 

with the vessel in 

The wind 

deli vers air 

diameter 

orifice plate with a 

to its outlet end. The 

before each test to 

miles per hour from 

a blower which 

of 5-incha sheet-metal 

orifice fastened 

blower shall be adjusted 

a wind velocity of 3 

a distance of 6 as 
EE-RM-90-201 COMMENT OOR4

four 6-inch 

a area foot square 

to the axis of the air stream 

orifice. 

maintained. 

Determinations made at each !.JU:~HjcVH shall be 

of 2 minutes duration. 

2.6.12 

fected the any of burners 

under Conditions 1, 2 and 3 in Table X. 

2.6.13 Burners shall 

without undue 

and 3 Table X. 

Method of Test 

The burner 

"''''''Ul'~ for ",.uUUH;:a 

in Table X. 15 minutes of 

rate to the burner shall be 

not exceed 500 Btu per hour. 

The burner shall then remain in and 

be to Test Condition 2 in X for 

an 5-minute which a stable 

flame shall be maintained. 

PILOT BURNERS AND SAFETY 

SHUTOFF DEVICES 

2.8.3 The time 

device to close off the 

1 minutes when the 

Test 1 in Table 

shutoff 

Method of Test 

the burner controlled 

shall be 

a. When an 

the 

Oven burner is controlled 

shutoff the oven thermob. 

c. 

stat 

of the 

be set at the 

thermostat dial. temat center of the oven has reached 

measured an or 

and thermoaccording to the method 

in 2.12, the the rmos tat shall be 

this temperature. The 

burner shall then be operated for 1 hour 

and the test started. 

be set to 

The burner 

for 15 minutes 

oven and 

is controlled the 

the test conditions 

"b" above. 

the 

have shall be 

the device to 

to the controlled 

and time 

shut off the gas 

noted. 

2.19 EVALUATION OF CLOTHING 

IGNITION POTENTIAL 

2.19.4 Oven 

The test outlined in 

ap]!'u..dU";""'" with ovens. 

shaH be conducted on 

The test outlined "b" shall be conducted 

with ovens where the oven bottom is 36 

or less above the floor when 

accordance the instaUation 

structions. 

Method Test 

a. U'C'd'CIUI'l": into Oven. 

lowest 
EE-RM-90-201 COMMENT OOR4

The gas to the oven shall be 

the thermostat set to 400 F and the oven 

to with its door open for at least 10 minutes. 

6-inch simulated 

of test 

half so there are no 

cut edges and used to grasp the oven rack the 

front within the fold. The oven rack shall 

be full out and then returned 

to normal of the test 

material shall occur. 

This test shall be with the simulated 

holder folded in half so as to form a 

b. ;JL,un.;u."'fi Beside Open Oven Door. 

The oven racks shall be removed. The gas to the 

oven shall be the thermostat set 

to 400 F and the oven to with its 

door open for at least 10 minutes. 

One corner of a 6-inch 6-inch simulated 

as described in 2. shall be 

to the of the of the open oven 

door closest to the oven 8). The 

free of the material be moved 

direction from the of attachment and 

to dwell at for 30 seconds. No 

of the test shall occur. 

2.20 EVALUATION OF BURN HAZARD 

POTENTIAL OF EXTERIOR SURFACES 

2.20.1 The contact ternDer:atlJu'e,s 

when its 

with the exterior surfaces of 

not exceed 131 F for surfaces feet or less 

above the floor and 149 F for surfaces 3 

feet but not more than 5 above the floor, 

be used, 

Method of Test 

thermesthesiometer an instrument constructed accordance with 

National Bureau of Standards Technical Note Number 816: "Engineering and 

Construction Manual an Instrument to Make Burn Hazard Measurements 

COnSUmE"f Products." A commercial model may be purchased from 

Dynatech Thermatest 99 Erie Street, carrmncage, 

02139. 

5 

When the ro.om T01m .. ",,,,',, is other 

shall be 

F for each 5 

or less than 

the allowablte 

increased or decreased 

F of room 

shall be installed with 

at least 1 foot above 

and 1 foot on either side of and with 

no side walls. Built-in appliances shall be installed 

in an enclosure constructed in accordance with the 

manufacturer's installation instructions. Surfaces 

to be measured shall be c leaned to remove surface 

dirt and oil before tests a re begun. 

With the unit at room 

shall be turned on and 

be set to maintain an oven 

measured in accordance with 

scribed in 2. of 400 ± 5 For, on continuous 

the 

if in excess of 400 F, 

increased or decreased 

F of room 

F. The oven 

be closed. When a unit more 

the test shall be conducted with 

Broilers shall not be 

conduct of these tests. 

Burn hazard shall be dete rmined on all 

exterior surfaces hour after the 

Burn hazard 

for: 

a. 

has first been or, 

at the manufacturer's 

is 

shall not be determined 

surface of the section 

section burners and 

such as 
EE-RM-90-201 COMMENT OOR4

c. surfaces 

and 

d. flue 

faces 

than 5 feet above the 

or 

Burn shall be measured with 

the set for a 4-second probe 

contact time. Prior to each reading, 

the shall be cooled to stabilization 

temperature. 

The temperatures indicated by the thermes - thesiometer shall not exceed the limits 

above. 

9, deleted.) 

10 becomes 

2.20.2 

the 

of 

above 

131 F 

alternate method for 

of surfaces above 

the surface measurement 

and teltnUleratlue limits for suror less above floor as 

H.pp'l:!" ..... IULA E may be used. 

Method of Test 

section 

2.4. 

1 hour 

X. Burn hazard 

be determined with a 

burner shall 

shall be 

Test Conshall 

as described in 2.20.1. The maximum contact H>l'lnnIC'r 

ture on unbroken surface other than 

areas, above the burners 

not exceed 131 (55 C) on a room 

of 77 F. Where the room 

ture is other than 77 the allowable 

shall be increased or 1 

each 5 F of room 

less than 

TEMPERATURES OF 

KNOBS 

on door valve hanand any other knobs 

<1"''''"'''7 normal COiokllng 

exceed those spl~Clne'a 

TABLE XII 

MAXIMUM HANDLE AND KNOB 

F* 

Column A Column B 

Bare or metal 131 (55 C) 152 (66.7 C) 

149 (65 C) 172 (77.8 C) 

167 (75 C) 182 (83.3 C) 

Glass 

Wood or plastic** 

* Maximum allowable temperatures are based on 

a 77 F (25 C) room temperature. When the 

room temperature is other than 77 the al-

** 

lowable temperatures for handles knobs 

shaH be increased or decreased 1 degree F for 

each degree F of room temperature greater 

or less than 77 F. 

or 

with a metal not more 

thick and a 

not less than 0.005 inch thICk. 

Method of Test 

as 

and 

means of No. 24 AWG ironin firm contact as 

with the handle or knob 

shall be measured on all 

handles and knobs that are 

and shall not exceed temin Column A of Table XII. 

knob skirts inch or 

of knob shall not exceed the U<O'"UJl,",,", in Column B of Table XII. 

b. When handles and 

to be affected more 

knobs are located so as 

of section 

burners than 

additional test 

tion shall be made to 

oven burners, an 

section in 

handle 

sections shall be tested with a 7-

each 
EE-RM-90-201 COMMENT OOR4

and 

burners shall be 

until the 

determined in 

reaches 400 F or the 1"""~r"H'~ 

the maximum of 

lower. This 

constant for the remainder of the 1-hour test 

The operating temperature of the griddle 

surface shall be increased or decreased 1 degree F 

for each F of room greater 

or less than 77 F. Temperatures of handles and 

knobs shall be determined as described in "a" 

above and shall not exceed the 

in Table XII. 

2.22 

2.22.1 The maximum of eXI!)O~,eO wall or counter surface aOlaC!erlt to a 

concealed waH or enclosure surface in 

COm:2ICI with or to and the burner 

box surface of a broiler 

unit that extends into the shall not 

be more than 117 F in excess of a room ~<t::!.un~l 

ture of 70 F. The temperature on the 

beneath a floor-mounted unit shaH not be more 

than 90 F in excess of a room of 70 F. 

Method of Test 

a. Test Enclosures. 

The shall be installed in a "u,na."H,Y 

instrumented test structure ctIJIJU\-ctl"H;; 

type of as listed below: 

A floor-mounted unit not 

elevated oven or broiler shall 

in a partial test enclosure with its back 

and sides parallel to the walls of the 

enclosure, as shown in Figure 10, and 

with the spacing specified in Figure 1 O. 

A floor-mounted unit of either the room 

heater or bungalow type shall be installed 

in the test enclosure with side wall clearinches, as specified 

and back wall clearinches a flue 

but not less than 6 from the 

of the unit. The back wall clearance 

unit fuels 

be as 

Vertical walls of the enclosure shall be 

constructed of either nominal 1-inch -thick 

wooden boards and 

finished in flat wall shall 

be 6 feet The lower side walls shall 

extend at 6 inches the oven 

door surface and be 

so that be even with the 

be equipped with 

increase their height to 6 

be constructed of 

oak 

2. A floor-mounted unit incorporating an 

elevated oven or broiler shall be installed 

in an enclosure as shown in Figure 11. 

The back wall and the floor shall be as 

described in "1" above. The simulated 

cabinets shall be constructed of either 

nominal 1-inch-thick wooden boards or 

3/4 -inch plywood with dimensions as indicated in Figure 11. All surfaces facing 

the appliance shall be finished in flat 

black. The unit shall be installed flush 

with rear wall and cabinet surfaces. to side walls 

and 

shall be as specified 

3. A built-in top section, 

or combination thereof, be 

in an enclosure as described by 2.1.9 and 

shown in 4. 

4. A built-in oven, enclosed broiler unit or 

combination oven and enclosed broiler uni t 

shall be installed in an enclosure as desscribed in 2.1.10 and shown in 5. 

When an oven, broiler, or combination 

oven and broile r, is provided with a flue 

collar, a 4-foot-high listed Type B Gas 

Vent of the specified by the manufacturer (see .25.9) shall be attached to 

the flue collar. At the points where the 

vent pierces the panel directly above the 

top of the unit and the top panel of the 

enclosure, an opening shall be cut which 

will provide an annulus around the vent 

in accordance with its listing. The annuli 

thus formed shall be sealed on their top 

surfaces with asbestos paper (see Figure 12). 

A unit differing from the 

"I" "4" above 

the test structure most 

and modified as deemed 

agency. 

b. Instrumentation. 

Test enclosure i'~,~,~~,~~ 

mined f.-.eans 

eter No. 24 copper-constantan 
EE-RM-90-201 COMMENT OOR4

Extensions 

above 

cooking top, 

adjustable 

sidewise in 

integral 

inches 

(clearance(s) 

specified by 

manufacturer) 

Side walls 

extend 

6 inches 

beyond 

oven door 

surface 

Installed with 

zero or I-inch 

clearance (specified 1 by 

manufacturer) Lower side 

walls aligned 

even with 

cooking top 

Installed with zero* 

or 1/2 inch clearance** 

* If zero side wall clearance specified, zero back wall clearance shall also be specified. 

** Spacing means to hold side wall away from side panel of unit not permitted. 

and 
EE-RM-90-201 COMMENT OOR4

- A--""'" 

Dimensions 

Wall and 

Construction to simulate 

13" deep wall cabinets 3D" 

o 

o 

B 

c---

as specified by 

18" 

84" 

36" 

Construction to simulate base 

cabinets extending 6 inches 

beyond oven door surface 

manufacturer 

Test Enclosure for 

Elevated Sections 
EE-RM-90-201 COMMENT OOR4

c. 

shall be at intervals 

of 3 inches over the entire surfaces 

the back and side walls the interior surfaces 

and on surfaces 

above the front of an elevated oven 

a built-in oven or or a combination 

oven and broiler unit. 

bedded in the floor shall be 6 inches 

floor-mounted 

the vertical 

intersects 

each the lower side walls. Each lower 

side wall shall also have two additional vertical rows of locatedat1-inch 

intervals both sides row ofthermointersected the vertical of 

the oven door surface. center line of the 

horizontal row of on each 

lower side wall shall be below the 

top. 

An enclosure for a 

additional 

ter or wall 

on center lines 

the recess 

built-in unit shall have 

embedded in counat intervals of 2 inches 

inch from the of 

the and 

in other enclosed surfaces 

the agency. For a vented 

or combination oven and 

as describedin2.22.1-aand 

5, additional as previously described, shall be on the 

bottom of both combustible surfaces, centered inch away from the annuli around 

the (See 12.) 

Determination. 

of 

be 

shall be de2. 

3. 

4. On a built-in 

the on 

that extend into the cabinet 

determined as 

d. Electrical 

e. Test Period. 

where 

The <1Pll'H.:1,,,;t;: 

under 

tinued in 

ditions of 

and 

Table 

conditions 

Table XIII. 

ferent times are 

different sections, the sections shall be 

turned on in a sequence that allows the 

various tests to be run and 

ended 

shall be closed during the tests. 

test periods, and operin Table XIII, all ~ .... "u~.<UJ.'" 

shall be and reambient room shall be 

thermometers located as shown in 

recorded. 

end of the test no enclosure or 

shall exceed 117 F or 90 

above a room of 

maximum wall, enclosure or burner box surface 

ture, 
EE-RM-90-201 COMMENT OOR4

Cabinet ~------------------------~ Cabinet 

~ 30" Minimum 

Dimensions A and 

Test ...... "" .. , 

Area 

"All 

Both 

sides 

manufacturer 

taIled in 

as shown for 

Unit. 

14 
EE-RM-90-201 COMMENT OOR4

observed 

above 70 

5 

low 70 

rise 

for surfaces and 

PERFORMANCE OF UNITS PROVIDED 

WITH PYROLYTIC SELF-CLEANING 

OVEN OR SELF-CLEANING BROILER 

FEATURES 

2.26.1 

broiler features 

of carbon monoxide excess 

a room of cubic foot content witb 

ch::uu.es tbe combustion of 

Method of Test 

outlet 

carbon dioxide 

the manufacturer's 

shall also be ob-

~<11lJ,UJl'" of operaafter each 

contact ternpEer,atu 

faces of 

features shaH 

tbe unit 

Method of Test 

,,"'lYUH'" pershall be determined on 

in 2.20. tbat temtaken on vertical surof the oven door and tbe 

surface. If surface is tbis surface is considered to extend inches above the 

of the oven 

Ovens. 

of 

Provided 

valve hanother knobs 
EE-RM-90-201 COMMENT OOR4

IVens, 

lVen. 

Z.26.11 become 2.26.7 
EE-RM-90-201 COMMENT OOR4

E 

is informative and is not of the 

The burn hazard 

may also be determined 

in 

test 

shown in E-1 and surface te!ffil:ler 

limits "'V,.,"'jlU.'~ in Table E-I. 

The 

in 2.20. 

E becomes AlJ'pemlllJ!: 

2.20 

14 

TABLE E-I 

MAXIMUM SURF ACE F* 

Bare or ICI<lIU"""U 

Porcelain "" .. , ..... "". 

Glass 

** 

or 

thick. 

152 

160 

172 

182 

182 

190 

202 

212 

F room temis other 

are to be increased 

F for each F of 

or less than 77 F, 

with a metal 

thick and 

not less than 
Calibration Reference Mark Scribed on Shaft 

1/4 Tubing Ferrule-Positioned to obtain 

Ibs. Pressure at Reference 

* Dimensions shown above are based on use 

of the following purchased parts: 

Marlin #1060 Iron-Constantan Plug Marlin 111070 Tube Adapter 

#C420-045-1000 Spring 

(Associated Spring Corp.) 

** This dimension will vary so that 

5 lbs. calibration will align with 

reference mark on probe shaft. 

7/32 x .020 Copper Disc. #24 Ga. Rubber Insulated Thermocouple Wire

Type J Iron-Constantan, Silver Soldered at Outer Face of Disc 

11/16 Die. x 3/4 Cork: ASTM P2l17P Med. Grade Gasket Cork 

11/16 0.0. x 3/64 Wall x 5/8 Copper Cap Cork Protector 

Brass Washers Silver Soldered to Tubing 

1/4 0.0. Stainless Steel Tubing 

.420 Dia •. 045 Wire x 1.0 Spring, Ends Flattened 

and Ground, Spring Rate: 20.72lbs./in.* 

3/8 0.0. Aluminum Tubing 

Vood File Handle 

4-7/8 

6-3/8 

13 

-

.".. (All dimensions are in inches.) 

Ther

wire

1/16 

disc

thro

hole

E ... 1. T.n1l'W1ln£hl}'OfI'lItll1l1l"'.ftI and Probe