SUN - UL 2158, Electric Clothes Dryers

New clause added;

The installation instructions of an appliance that employs non-current-carrying metal parts within the enclosure that are accessible during installation and not grounded in accordance with Clause 27.1.4 shall include the following or equivalent:

²Certain internal parts are intentionally not grounded and may present a risk of electric shock only during servicing. Service Personnel – Do not contact the following parts while the appliance is energized: ___.²

A list of ungrounded parts shall be inserted.

New clause added;

The installation instructions of an appliance that does not comply with Clause 22.5.7 shall include the following or equivalent:

²To reduce the risk of fire, this appliance must be fastened or otherwise secured to an uncovered concrete floor.²

New clause added;

The user maintenance instructions of an appliance that employs non-current-carrying metal parts within the enclosure that are accessible during user servicing and not grounded in accordance with Clause 27.1.4 shall include the following or equivalent:

²Certain internal parts are intentionally not grounded and may present a risk of electric shock only during servicing. Service Personnel– Do not contact the following parts while the appliance is energized: ___.²(A list of ungrounded parts shall be inserted.).

Additions to existing requirements are underlined;

When an appliance is operated under the conditions specified in Clause 19.1.2, there shall be no:

a) emission of flame or molten metal;

b) glowing or flaming of combustible material upon which the appliance can be placed or that can be in proximity to the appliance as installed;

c) glowing or flaming of the cheesecloth; or

d) indication of flame or glowing embers in the load of clothes either before or after the access door is opened.

Additions to existing requirements are underlined;

An appliance shall be operated under all of the following conditions:

a) the test load shall be 100% of the rated load;

b) the test cloths shall be dry and tumbled for 5 min;

c) the temperature-regulating thermostats shall be shunted out of the circuit;

d) temperature controls shall be set to the position resulting in maximum temperatures in the dryer;

e) the timer shall be set to the longest drying time duration and the drum shall be held in a stationary position;

f) the heating element shall have one of its terminals open circuited and the element grounded at a point which will result in a current of 110% of the rating of the intended branch-circuit overcurrent protection flowing through the heater. If the current at 110% results in opening the heating element then the test shall be conducted at the maximum current that will result without the heating element opening; and

g) the appliance shall be supported on a surface of soft wood covered with four thicknesses of cheesecloth.

New section added;

Flood test

An appliance shall be tested as specified in Clause 19.3.2.2 to determine if failure of a water valve, water pump, or control of the valve or pump results in:

a) a leakage current greater than 5mA for cord connected appliances;

b) insulation resistance measured as described in Clause 13.2 less than 50 000 W between current-carrying parts and interconnected non-current-carrying parts for permanently connected appliances;

c) insulation breakdown as determined by repeating the electric strength test; or

d) obvious wetting of any electric component.

Note: Obvious wetting shall be considered to be wetting by a stream, spray, or dripping of water on the component that is observed during each test. Wetting by random drops of water that occur by chance and are not replicated are not considered obvious wetting.

The appliance shall be leveled prior to the test. The appliance shall be connected to the water supply or the water tank shall be filled with water as applicable. The water supply shall be 125 psi and 60 ±2°C if intended for hot water connection and 15 ±5°C if intended for cold water connection. The appliance shall be operated for 15 minutes after first evidence of overflow from the drum with the water valve locked open or the water pump locked on.

Breakdown of belts or parts and the interruption of water supply

Additions to existing requirements are underlined;

An appliance shall be tested as described in Clauses 19.4.2 and 19.4.3, and there shall be no:

a) emission of flame or molten metal;

Note: Drops of melted solder are not considered to be molten metal.

b) glowing or flaming of combustible material upon which the appliance can be placed or that can be in proximity to the appliance as installed;

c) glowing or flaming of the cheesecloth; or

d) indication of flame or glowing embers in the load of cloths, either before or after the access door is opened.

Additions to existing requirements are underlined;

With consideration given to the design of the appliance, the appliance shall be operated under abnormal conditions representing those likely to be encountered in actual service, such as the breakdown of drive belts or other parts, or interruption of the water supply to an appliance of the condensing type. Ordinarily, only one such condition shall be assumed at one time. In each abnormal-operation test, the drum shall be loaded with dry cloths having the weight specified in Clause 5.2. The cloths shall be stacked by hand, without propping by means of other objects, in the position that will result in maximum temperatures on the cloths in the stationary drum. The appliance shall be supported on a surface of soft wood covered with four thicknesses of cheesecloth. Before the start of the test, the appliance shall be thoroughly heated by being operated through one complete cycle of normal operation.

Blockage of lint screen, exhaust, and condenser

Additions to existing requirements are underlined;

A household appliance shall be tested as described in Clauses 19.5.2 to 19.5.8, and there shall be no:

a) emission of flame or molten metal;

Note: Drops of melted solder are not considered to be molten metal.

b) glowing or flaming of combustible material upon which the appliance can be placed or that can be in proximity to the appliance as installed;

c) glowing or flaming of the cheesecloth; or

d) indication of flame or glowing embers in the load of cloths, either before or after the access door is opened.

Additions to existing requirements are underlined;

An appliance shall be operated as described in Clause 19.5.7 under each of the following conditions, in turn:

a) lint screen blocked 75%;

b) lint screen blocked 100%;

c) exhaust blocked 75%;

d) exhaust blocked 100%;

e) air flow of condenser blocked 75%; and

f) air flow of condenser blocked 100%.

New clause added;

The requirements of Clause 19.5.2(c) and (d) do not apply to condensation type tumble dryers.

New clause added;

The requirements of Clause 19.5.2(e) and (f) do not apply to vented type tumble dryers.

Additions to existing requirements are underlined;

Each blockage is stated as a percentage of the total effective area of the opening as follows:

a) lint screen blockage shall be in the area representing lint build-up;

b) exhaust blockage shall be at the point where the air exits the dryer prior to connection of external exhaust ducts that are to be put in place when the dryer is installed; and

c) condenser blockage can be at the inlet or the outlet of the condenser unit, and shall be in the cross sectional area representing drying air flow.

New clause added;

At the discretion of the manufacturer, the temperatures in the appliance base, as defined by Clause 19.7.14, which are monitored during the tests of Clause 11, may be monitored during the tests of Clauses 19.5.2 – 19.5.7 for the purpose of confirming the validity of excluding the design under test from the Base fire containment, Clause 19.7, tests.

New section added;

Load fire containment

This new section includes new construction requirements, performance test requirements, markings, and instructions for Appliances having a rotating drum or basket (see standard for section details).

New section added;

Base fire containment

This new section includes new construction requirements, performance test requirements, markings, and instructions for Appliances having a rotating drum or basket (see standard for section details).

New clause added;

A thermistor-type temperature sensing device, such as a positive temperature coefficient (PTC) thermistor and a negative temperature coefficient (NTC) thermistor, that performs a temperature-regulating, temperature-limiting or combination temperature-regulating and -limiting function shall comply with:

a) CAN/CSA E60730-2-9 and

b) UL 1434 or UL 60730-2-9.

The number of cycles to be used when testing a sensing device in accordance with the endurance tests required by these standards is 100,000 cycles for temperature-regulating, -limiting and combination temperature-regulating and -limiting devices.

New clause added;

A neutral-grounding link or the equivalent shall not be colored green.

Polymeric Materials

New clause added;

Polymeric material employed to support a live part, in direct contact with a live part, or within 0.8 mm from a live part shall be rated for use at the operating temperature involved and shall have the following material properties determined in accordance with CSA C22.2 No. 0.17 and UL 746C:

a) volume resistivity of at least 50´106 ohm-cm;

b) comparative tracking index (CTI) of at least 175 volts (PLC 3 – see note (a) of Table 11) for a moderately contaminate environment; and

c) a high current arc ignition (HAI) and hot-wire ignition (HWI) as specified in Table 11.

New clause added;

In reference to Clause 33.1.4(c), the high current arc ignition of a material need not be evaluated when:

a) the spacing over the surface of the material is at least 12.7 mm between:

1) live parts of opposite polarity, and

2) live parts and grounded non-current-carrying metal;

b) the material is evaluated by conducting the end-product arc resistance test of UL 746 Cusing the power (current, voltage and power factor) of the circuit in the dryer; or

c) the live parts are part of a low power circuit, where the maximum power available does not exceed 15 W.

New clause added;

In reference to Clause 33.1.4(c), the hot wire ignition of a material need not be evaluated when:

a) the material is evaluated by conducting the abnormal overload test or end-product glow-wire test of UL 746C; or

b) the live parts are part of a low power circuit, where the maximum power available does not exceed 15 W.

New clause added;

In reference to Clause 33.1.4, foamed thermoplastic material employed for sound reduction that is in direct contact with an uninsulated live part or is within 0.8 mm of an uninsulated live part shall be rated HF-1 and is not required to be evaluated for CTI, HWI, and HAI.

New clause added;

With respect to Clause 33.1.4(b), if suitable measures are taken to protect the environment from contamination, the material shall have a comparative tracking index of at least 100 V (PLC 4) for a relatively clean environment.

New section added;

(Normative) Safety of Smart Enabled Electric Clothes Dryers

This new section includes new construction requirements, performance test requirements, markings, and instructions for electric clothes dryers intended to receive and respond to communication signals or data relating to power billing rate or demand response or communication signals from a remote user interface, such as a smart phone or computer. The clothes dryer response can include paused operation, delayed start, remote start or stop, or modified operation (see standard for section details).