UL风筒测试项目

Test Plan for Hair dryer

HD-001

Product Details:

Type of test object………………..…: Hair dryer

Model No. ………………………......: HD-001

Version……………………………....: UL

Ratings………….…………………...: 125VAC 60Hz, 1875W

Manufacturer ………………………..: Hang Shun Hing Co., Ltd

Prepared by ………………………...: Steven Zhang

(Printed name and signature) ……………………. Approved by ………………………...: Andy Hu

(Printed name and signature) …………………….

Date of Issue………………………..: 2011-01-04

Number of pages………………......: Total 10 Pages

Testing Laboratory:………………..: Hang Shun Hing Co., Ltd (ENGINEERING TEST CENTRE). Address……………………………..: Shek Pai District, Heung Shakok, Dongguan, Guangdong, China.

Test specification:

Reference standard:………………: UL 859: 2007-03

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Contents Section 1: General conditions

1.1 Scope

1.2 Atmospheric conditions

Section 2: Performance

2.1 Power Input test

2.2 Performance test

Section 3: Life / Endurance / Strength

3.1 Unit life test

3.2 Cord flexing test

3.3 ON/OFF switch acceptances test

Section 4: Safety test

4.1 Strength of enclosure test

4.2 Leakage current test

4.3 Leakage current test following humidity conditioning

4.4 Dielectric voltage-withstand test

4.5 Hand supported hair dryer- temperature test

4.6 Softwood surface temperature test

4.7 Strain relief test

4.8 Drape test

4.9 Locked rotor drape test

4.10 Stalled rotor test

4.11 Motor slowdown test

4.12 Restricted air inlet test

4.13 Restricted air outlet test

4.14 Broken heating element test

4.15 Component fault Test

4.16 Motor short-circuit Test

Section 5: Packing

5.1 3 Feet unit drop test

5.2 6 Feet unit drop test

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Test

Result–Remark Verdict

–

Clause Requirement

Section 1: General conditions

1.1 Scope

Hand-supported hair dryer, HD-001, UL version.

1.2 Atmospheric conditions

Tests are carried out at (25±10) ℃, (60±30) %RH, (86-106) kPa.

Section 2: Performance

2.1 Power Input test (QTY: 1 pc)

Connected the unit to an alternating current, 60Hz source of supply and

input rated voltage. And then, operated under the Max. Setting conditions of

use. With the sample operated one minute, the power input to the unit was

measured by the use of a suitable meter.

The power input shall be within the inclusive range of 90 – 110 percent of

that rating.

2.2 Performance test (QTY: 3 pcs)

Connected the unit to a rated voltage 125V 60Hz power source and

operated under various conditions of use; with the sample in a state of

thermal equilibrium. Measured the Power input, Current, Motor Speed,

Noise (20 cm) and Wind Speed of the unit.

The test data shall comply with the product spec. of HD-001

Section 3: Life / Endurance / Strength

3.1 Unit life test (QTY: 3 pcs)

Connected the unit to alternating current, 60Hz source of supply and under

highest rated input voltage. Test the appliance “10 minutes ON” and “10

minutes OFF” until 200 hours completed.

The appliance shall still functional after 200 hours.

3.2 Cord flexing test (QTY: 6 pcs)

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6 samples of handle with power supply cord are used for test. Each

conductor is loaded with the rated current of the appliance at rated voltage:

Test A

3 pcs samples for 6,000 cycles at 540 degrees of rotation in rotation and

reverse rotation to the starting point with 1/4 LB weight load attached to the

cord 8 inches from the cord entry and flexing rate 10 cycles per min.

Test B

℃℃

3 pcs samples are placed in oven with 87 for 168 hrs or 100 for 96 hrs.

Following oven conditioning and cooling to a room ambient. 1,000 cycles at

540 degrees of rotation in rotation and reverse rotation to the starting point

with 1/4 LB weight load attached to the cord 8 inches from the cord entry

and flexing rate 10 cycles per min.

There was no break or exposure of live parts of the power supply cord.

There was no indication of dielectric breakdown

3.3 ON/OFF Switch acceptances Test (QTY: 3 pcs)

3 switches are tested in appliance with10,000 cycles, 10 cycles per minute.

The appliance is supplied by rated voltage and test in “OFF” to “Max power”

positions.

After the test, applied the dielectric strength to – disconnection/different

potential/different polarity.

The units shall show no damage and normal function after the test.

The dielectric shall not breakdown.

There was no indication of dielectric breakdown.

Section 4: Safety test

4.1 Strength of enclosure test (QTY: 3 pcs)

According to Clause 28.1 UL 859.

One sample was subjected to this test a 5 lb (22.2 N) force was applied for 1

min at each enclosure grill opening of the sample. The force was applied to

the grill from the flat end of a 1/4 in. (6.2 mm) diameter by 5 inches (127mm)

long steel rod. The rod was vertical when applied to the sample and the

sample was oriented in the most adverse position. After this, the enclosure

opening was examined by use of an articulate probe and the product was

examined for short spacing.

The steel rod did not come in contact with any uninsulated live parts during

this test. The articulated probe could not touch any live parts and there was

no reduction for spacing between uninsulated live parts of opposite polarity

and between uninsulated live parts and dead metal.

4.2 Leakage current test (QTY: 1 pc)

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According to Clause 31 UL 859.

One sample was mounted on an insulation surface and was connected to a

125 v, 60 Hz source of supply. Leakage currents to each ground measured

from all accessible metal parts of the unit by use of a meter with an input

impedance of 1500 ohms shunted by a 0.15 μF capacitor. The unit was

wrapped in a conductive foil, and conditions outlined below, first with the

plug in the normal position and then with the plug reversed.

0.5 mA for an ungrounded (two wire) portable, stationary, or fixed appliance.

4.3 Leakage current test following humidity conditioning (QTY: 1 pc)

According to Clause 32 UL 859.

One complete sample of the appliance, which had been preheated to a

temperature just above 34℃, was placed in a humidity chamber and

exposed to moist air having a relative humidity of 88±2 percent at a

temperature of 32±2 for a period of 48h. at the end of this conditioning, while

still in the chamber the leakage current was determined using a meter with

an input impedance of 1500 ohms shunted with a 0.15 μF capacitor. The

sample was then operated while either in the chamber or immediate

afterward. The leakage current was measured under the following

conditions using polarities of the supply source.

0.5 mA for an ungrounded (two wire) portable, stationary, or fixed appliance.

4.4 Dielectric voltage-withstand test (QTY: 1 pc)

According to Clause 38 UL 859.

While in a well-heated condition an “as received” sample was completely

wrapped in conductive metal foil and was subjected to a dielectric potential

of 2500 V. the 60 Hz potential was started at zero and was gradually

increased to the maximum value of 2500 v where it was maintained for a

period of 1 min. the test potential was applied between live electrical

connections and the which was in contact with any exposed dead-metal

parts.

There was no indication of dielectric breakdown.

4.5 Hand supported hair dryer- temperature rise test (QTY: 1 pc)

According to Clause 37.5 UL 859.

With the user adjustable controls set for the most severe condition of normal

use, one sample was connected to an alternating current supply source

adjusted to rated voltage or the voltage resulting in rated wattage, whichever

resulted in the maximum recorded wattage (129 V ac test voltage) and

operated at normal motor speed until a state of thermal equilibrium was

attained. A thermocouple grid described in Par. 37.5.2 of UL 859 was

centered 1 in. in front of the air outlet. Grid temperatures were continuously

monitored throughout the tests and the five highest grid temperatures were

recorded.

There shall not be a temperature rise greater than the limits, nor greater

than 100℃ (180℉) for the average of the five highest thermocouple

readings on the grid.

4.6 Softwood surface temperature test (QTY: 1 pc)

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According to Clause 39.3.1 UL 859.

One sample was placed on a flat horizontal softwood surface, which was

covered with two layers of white tissue paper. The sample was connected to

an alternating current supply source adjusted to rated voltage or the voltage

resulting in rated wattage, whichever resulted in the maximum recorded

wattage (129 V ac) during the input test. The sample was operated until a

state of thermal equilibrium was attained. The sample was positioned to

produce the maximum temperature on the paper-covered supporting

surface. Thermocouples and a temperature-indicating meter were used to

measure the surface temperature.

The temperature rise on the paper shall not exceed 125℃

4.7 Strain relief test (QTY: 1 pc)

According to Clause 41.1 UL 859.

A sample, with the internal power supply connections disconnected, was

subjected to a 35 lb force on the cord in the direction which would result in

the greatest strain being exerted on the strain relief means. The force was

applied for a period 1 min

There was no displacement of the power supply cord, which would indicate

that stress was applied to internal connection.

4.8 Drape test (QTY: 1 pc)

According to Clause 39.2 UL 859.

One sample was placed on a flat horizontal softwood surface, which was

covered with two layers of white tissue paper. The sample was connected to

an alternating current supply source adjusted to the voltage resulting in

rated wattage (129 V ac). The sample was operated until a state of thermal

equilibrium was attained, and then draped with a double layer of

cheesecloth and operated for 8 hours or until stabilized conditions are

apparent, whichever is longer.

The 3 A fuse did not open.

The cheesecloth shall not discolor, glow, or flame as a result of this test. 4.9 Locked rotor drape test (QTY: 1 pc)

According to Clause 39.2A UL 859.

After the above Drape test, the double layer of cheesecloth was taken away,

and then the motor blower was locked and a single layer of cheesecloth

loosely draped over the appliance. The dryer is then to be operated for 7.5

hours or until stabilized conditions are apparent, whichever is longer.

The 3 A fuse did not open.

The cheesecloth shall not discolor, glow, or flame as a result of this test. 4.10 Stalled rotor test (QTY: 1 pc)

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One sample with the rotor of the motor mechanically stalled, placed on a

tissue covered softwood surface and connected to a 125 V ac supply

source. The sample was covered with a double layer of cheesecloth. The

test was conducted for a period of 7 h. A 3 a fuse was connected between

exposed dead-metal parts and earth ground.

The 3 A fuse did not open. There was no ignition of any material, or

emission of flames, sparks, or molten metal. The sample did not collapse

and there was no displacement of parts. The tissue paper did not char or

ignite. The cheesecloth did not glow or flame. The thermostat did cycle. The

thermal cutoff did open.

4.11 Motor slowdown test (QTY: 2 pcs)

According to Clause 39.3.7 UL 859.

Test A

Thermocouples were placed on various internal components and surfaces

as indicated in the results. The samples were operated in the severest

condition of normal use. The heater and motor circuits were separated to

allow the motor voltage to be varied with negligible effect on the heater

circuit. This was accomplished by powering the motor with a separate

source of supply and providing the sample under test with an equivalent

dummy motor load. Beginning at 2062 W (110 percent of the rated wattage),

the voltage to the internal motor was reduced at a rate of 1 V/min until the

thermostat operated. The motor voltage just above control operation was

recorded and subtracted from the normal motor voltage. The motor voltage

was increased by 10 percent of this difference unless a large increase was

necessary to prevent the control from reopening. The appliance was held at

this value until constant temperatures were recorded on the thermocouple

grid.

Test B

Method A was repeated with all temperature controls shunted and the

voltage to the internal motor was reduced at a rate of 1 V/min until the

thermal cutoff opened. The temperatures were recorded on the

thermocouple grid.

There shall not be a temperature rise greater than 100℃ (180℉) for the

average of the five highest thermocouple readings on the grid.

4.12 Restricted air inlet test (QTY: 2 pcs)

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According to Clause 39.3.3 UL 859.

Test A

Three samples were tested. Each sample was operated in the most severe

condition of normal use at 110 percent of the rated wattage. The air intake

openings were gradually obstructed by using a maximum of ten layers of

terry cloth sized at least 2 in. greater than the dimensions of the intake

openings. These were placed over the openings one layer at a time at 3 min

intervals until the temperature control thermostat functioned. If the

temperature control did not function after ten layers were in place, then the

sample was allowed to operate with ten layers for 7-1/2h. All exposed

dead-metal parts were connected to earth ground through a 3 A fuse.

Test B

Method A was repeated with all temperature controls shunted and continued

until the thermal cutoff opened. If the thermal cutoff did not open after ten

layers were applied, no additional layers of terry cloth were added, and the

sample was allowed to operate for 7h.

In each case, there was no ignition of materials, emission of flames, sparks,

or molten metal. There was no displacement of parts or exposure of live

parts and the ground fuse did not open. There was no component burnout

other than the thermal cutoff. In Method A, the temperature control did

function and the thermal cutoff did not open. In Method B, the thermal cutoff

did open.

4.13 Restricted air outlet test (QTY: 2 pcs)

According to Clause 39.3.4 UL 859. Test A Three samples were tested. Each sample was operated in the most severe condition of normal use at 110 percent of the rated wattage. The air outlet of each sample was gradually obstructed in steps, at 3 min intervals, such that approximately 50, 75, 90, and 100 percent of the outlet opening area was progressively blocked until the temperature control opened. The air outlet was obstructed so that the thermal cutoff stayed in the airflow for the longest time. If the temperature control did not function after 100 percent blockage, the sample was allowed to operate in this manner for 7h. A 3 A fuse was connected between exposed dead metal parts and earth ground. Test B Method A was repeated with all temperature controls bypassed. If the thermal cutoff did not open after 100 percent blockage, the sample was allowed to operate in this manner for 7-1/2h.

In each case, there was no ignition of materials, emission of flames, sparks

or molten metal. There was no displacement of parts or exposure of live

parts and the 3A ground fuse did not open. There was no component

burnout other than the thermal cutoff. In Method A, the temperature control

did function and the thermal cutoff did not open. In Method B, the thermal

cutoff did open.

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4.14 Broken heating element test (QTY: 1 pc)

According to Clause 39.3.6 UL 859.

One sample was subjected to this test. The heating element was severed in

several locations, electrical spacing were measured, and the accessibility to

live parts was tested by use of the articulated probe while the appliance was

rotated and handled as intended during normal use.

There was neither reduction of electrical spacing nor exposure of

uninsulated live parts.

4.15 Component fault test (QTY: 2 pcs)

Test A

Samples were connected to an alternating current supply source adjusted to

rated voltage or the voltage resulting in rated wattage, whichever resulted in

the maximum recorded wattage (129 V) and placed on a flat, horizontal

softwood source which was covered with a double layer of white tissue

paper. Dead-metal parts of the sample were connected to earth ground

through a 3 A fuse.

Test B

Short and Open Circuit Tests were then conducted on the motor diodes and

the appliance was allowed to operate in its most disadvantageous manner

for a period of 7 h. During each Abnormal Operation Test, the appliance was

draped with a double layer of cheesecloth. This test was conducted at the

maximum speed settings and repeated at the minimum speed setting of the

appliance.

The 3 A fuse did not open. There was no ignition of any material, emission

of flame, sparks or molten metal. The sample did not collapse and there was

no displacement of parts. There was no exposure of live parts. The

thermostat did not cycle. The thermal cutoff did not open.

4.16 Motor short-circuit test (QTY: 1 pc)

According to Clause 39.5 UL 859.

One sample of the appliance was placed on a flat, horizontal softwood

surface, which was covered with a double layer of white tissue paper. The

input terminals of the dc motor were short-circuited. All exposed dead-metal

parts were connected to earth ground through a 3 A fuse. The unit was

connected to an alternating current supply source adjusted to rated voltage

or the voltage resulting in rated wattage, whichever resulted in the maximum

recorded wattage (129 V ac) and allowed to operate under the most severe

conditions of use for a period of 7 h.

There was no ignition or charring of paper. The 3 A fuse did not open. There

was no ignition of any material, emission of flames, sparks or molten metal.

There was no exposure of live parts. The sample did not collapse and there

was no displacement of parts. The thermostat did not cycle. The thermal

cutoff did not open. There were no components burned out.

Section 5: Packing

5.1 3 Feet unit drop test (QTY: 3 pcs)

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Subject three energized unit to three (3) successive drops from a height of 3

feet onto a UL-859 standard hardwood surface. The unit shall show no

damage, function normal and the dielectric shall not be break down.

The articulated probe could not contact any uninsulated live parts. There

was no dielectric breakdown. Electrical components did not burn out. The 3

A ground fuse did not open.

5.2 6 Feet unit drop test (QTY: 3 pcs)

Subject a new unit to one (1) drop from a height of 6 feet onto a UL-859

standard hardwood surface without creating a hazardous condition and/or

exposing live parts/lead wires or failing leakage tests.

The articulated probe could not contact any uninsulated live parts.

There was no dielectric breakdown. Electrical components did not burn out.

The 3 A ground fuse did not open.

------The End-----