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Guidance for compliance to AS/NZS 3820 for hoverboards or self-balancing scooters

Until there is a specific Australian standard for Hoverboards, they shall comply with the latest requirements of AS/NZS 60335.1 (Incorporating Amendments 1, 2 and 3 or incorporating Amendments 1 and 2) Household and similar electrical appliances – Safety – Part 1: General requirements, including the requirements of Annex B and the following additions or variations as outlined below.

1 Scope

This clause of Part 1 is replaced by the following:

This Standard deals with the safety of hoverboards incorporating batteries containing alkaline or other non-acid electrolytes.

2 Normative references

This clause of Part 1 is applicable except as follows.

Addition:

IEC 62133, Secondary cells and batteries containing alkaline or other non-acid electrolytes – Safety requirements for portable sealed secondary cells, and for batteries made from them, for use in portable applications.

3 Terms and Definitions

This clause of Part 1 is applicable except as follows:

3.1.9 Replacement:

normal operation

the appliance with a fully charged battery is loaded in such a way to simulate the riding position and is operated on a continuous belt or rollers. The appliance is loaded with a load of 100 kg or the maximum load specified in the instructions, whichever is higher. The motors are loaded to 66% of their locked rotor current.

3.101

cycle

time required for the batteries to be discharged while under the conditions of normal operation until the appliance no longer operates plus the time required for the batteries to be fully recharged from the fully discharged condition with the appliance connected to its designated power supply unit.

3.102

hoverboard

appliance comprising of a power supply unit or a battery charging unit and a functional part. The functional part has one or more wheels fitted with a gyroscope controlled by the feet of the user and powered by internal batteries with a motor to drive each wheel. Hoverboards are also known as self-balancing scooters.

9 Starting of motor-operated appliances

This clause of Part 1 is not applicable.

11 Heating

This clause of Part 1 is applicable except as follows:

11.7 Replacement:

The appliance is operated for two cycles.

19 Abnormal operation

This clause of Part 1 is applicable except as follows:

19.13 Addition:

During the tests the temperature the battery surface shall not exceed 130°C.

24 Components

This clause of Part 1 is applicable except as follows:

24.101 Batteries used in the functional part of the hoverboard shall comply with the requirements of IEC 62133.

Compliance is checked by inspection and the tests in IEC 62133.

30 Resistance to heat and fire

This clause of Part 1 is applicable except as follows.

30.2.2

Not applicable.

The following additions and variations are currently under consideration

6 Classification

This clause of Part 1 is applicable except as follows.

5 General conditions for the tests

This clause of Part 1 is applicable except as follows.

5.3 Modification: The test of 21.102 is carried out before the test of Clause 11.

6.1 Modification: The functional part of a Hoverboard shall be of class III construction.

6.2 Addition: Appliances shall be at least IPX4.

11.8 Addition: The temperature-rise of surfaces that cannot be touched by means of test probe B of

IEC 61032 are not measured.

15 Moisture resistance

This clause of Part 1 is applicable except as follows:

15.1 Addition: Inspection shall show that there is no trace of water on the inside of the appliance that houses electrical parts.

19.101 The functional part of the hoverboard is subject to an overload condition where the load is
increased on the motors until the overload protection or the motor control operates. The motor current that caused the overload protection or motor control to operate is measured. The test is repeated with the functional part of the hoverboard loaded to give a motor current that is 90% of the current that caused the protection or motor control to operate. If the motor control or overload protection again operates the test is repeated with the motor current reduced in steps of 10% of the current that caused the protection or motor control to first operate until the motor control or overload protection does not operate.

19.102 Hoverboards with batteries that have cells connected in series are tested as follows.
All cells shall be discharged to the specified fully discharge condition except for one cell which is
discharged to 50% of the specified fully discharge condition.
The battery is then charged for to the fully charged condition and the voltage across the partially discharged cell is monitored to ensure that the charge voltage does not exceed the maximum voltage limit assigned by the manufacturer.

21 Mechanical strength

This clause of Part 1 is applicable except as follows.

21.1 Modification: Compliance is also checked by the tests of 21.101 and 21.102.

21.101 The functional part of the hoverboard with fully charged batteries is subjected to the test free-fall – procedure 1, of IEC 60068-2-31. It is then dropped from a height of 1 m. The hoverboard shall then be operated for one cycle, and the battery shall not rupture or ignite and the temperature the battery surface shall not exceed 130°C.

21.102 The functional part of hoverboards shall be designed to withstand vibrations to which they
may be subjected.

Compliance is checked by carrying out the vibration tests specified in IEC 60068-2-6 under the following conditions:

  • the functional part of the hoverboard is strapped to the vibration generator with the functional part in its normal position of use;
  • the direction of vibration is vertical;

the amplitude of vibration is 0,35 mm;
the sweep frequency range is 10 Hz to 55 Hz;
the duration of the test is for one cycle or 30 min whichever is longer.

After the test, the hoverboard shall show no damage affecting safety; in particular, no connections or parts the loosening of which may impair safety shall have loosened.