Technical Articles

IEC60335-1:2010 Standard Difference Points


NOTE 2: For appliances produced in the main body, some of which operate at a safe exceptionally low voltage and are delivered with a detachable power supply unit, the main part of the appliance is considered to be a Class I or Class III structure within a Class II appliance according to its suitability.

3.6.6 Widgets

Each surface is enclosed within a circular range of 15MM in diameter, or part of the surface exceeds the circular range of 15MM in diameter and no surface can accommodate a circle with a diameter of 8MM


Appliances equipped with voltage selectors are tested at the rated voltage position where the switch is placed in the test.


If the element or part of the appliance has both self-resetting and non-self-resetting characteristics, and the conformity to the standard does not depend on the non-self-resetting characteristics, then the appliance should be tested in the case of non-self-resetting characteristics being failed.


Symbol IEC60417-5018, to be marked on Class III appliances.

Appliances that work using batteries and rechargeable batteries charged outside the appliance may be unmarked with this sign.


Apparatus with a class III structure powered by a detachable power supply unit should state that the appliance uses only the power supply device equipped with the appliance


The gasoline used for this test is the aliphatic solvent ethane


Increase the heat generation coefficient of copper and aluminum motors:

Aluminum windings with ≥ 85% aluminum content and copper/aluminum windings, K=225;

Copper/aluminum windings with a copper content of ≥ 15% and < 85%, K=229.75;

Copper windings and copper/aluminum windings with a copper content of ≥ 85%, K=234.5;


The power cords No. 53 and No. 57 in IEC60245 are rated at 60°C

The power cord No. 88 in IEC60245 is rated at 70°C


For measuring leakage current, use a low-impedance ammeter that can measure the true RMS value of the leakage current


30.2.3 Applicable electric appliances and combination appliances (unattended appliances) are subject to overload operation tests.


Apparatus with a lid or door controlled by one or more interlocks, one of the interlocking devices should be released in the following two cases.

- When the chain is released, the lid or door does not move to the position of automatic opening;

- When the chain is released, the appliance will not restart.


In normal use, the power off or contactor is not short-circuited in order to ensure that the appliance can be powered and does not operate for this purpose in normal use.


For appliances with a main voltage selector switch, the switch is set at the lowest rated voltage position and the highest rated voltage value is used to supply power.


The insulation material buried in the heating conductor is considered basic rather than reinforcing.

This requirement does not apply to PTC heating element conductors.


For Class II structures, conductive liquids that are easily accessible or may become accessible in normal use and conductive liquids that come into contact with ungrounded and easily accessible metal parts should not be in direct contact with the basic or reinforced insulation, unless the reinforced insulation consists of at least 3 layers.


If necessary, perform the following tests on resistors and capacitances to determine their eligibility.

The resistance is tested at 14.1a in IEC60665, and the capacitor is tested at the rated voltage of the instrument according to the test of the Y-class capacitor in IEC60384-14.


When the sleeve is used as additional and reinforced insulation to the internal leads, it should remain in place in a manner that clamps the ends or can only be moved in case of destruction or cut-off.


For multiphase appliances that are powered by a power line and are intended to be permanently connected to a fixed wiring line, the power cord should be connected using a Y-connection.


The power cord for Class III appliances should have sufficient insulation. Through visual inspection, manual testing and the following tests are performed on class III appliances with live parts.

The insulation is at the test temperature of Chapter 11, and a voltage of 500V is applied between the wire and the metal foil that wraps the outside of the insulation layer for 2 minutes and should not be broken down.


The maximum value of the functional insulation clearance depends on:

-Table 16 based on rated pulse voltage

- If the quiescent voltage or the frequency of the cyclic peak voltage does not exceed 30kHZ, the quiescent voltage or the expected cyclic peak voltage is IEC60664-1 standard F.7a.

- If the quiescent voltage or the frequency of the cyclic peak voltage exceeds 30kHZ, the quiescent voltage or the expected cyclic peak voltage is Article 4 of the IEC60664-4 standard.


Insulating materials subjected to voltage cycle frequencies exceeding 30 kHz are evaluated in accordance with the provisions of 6.3 in IEC60664-4.



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