IEC60335-1 Clause 20.1 Standard Inclined Plane Test Device

The tester consists of a surface and an angle adjusting device with angles 0~15°C. The appliance
is placed in any normal position of use on a plane inclined at an angle of 10°C.
 
To the horizontal,the supply cord resting on the inclined plane in the most unfavorable position. 
However,if part of an appliance comes into contact with the horizontal supporting surface when the appliance is tilted through an angle of 10°C.

The appliance is placed on a horizontal support and tilted in the most unfavorable direction through
an angle of 10°C;Appliances provided with doors are tested with the doors open or closed, whichever
is the more unfavorable.

Appliances intended to be filled with liquid by the user in normal use are tested empty or filled 
with the most unfavorable quantity of water up to the capacity indicated in the instructions.

Reference standards:IEC60335-1 clause 20.1