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What is UL 60335-2-51?


UL 60335-2-51 is a technical standard that focuses on the safety requirements for household appliances using electric motors. This standard is important in ensuring the safety and reliability of various appliances we use in our daily lives, such as washing machines, vacuum cleaners, and fans.

Scope of UL 60335-2-51

UL 60335-2-51 covers a wide range of household appliances that have electric motors, including but not limited to:

Washing machines

Tumble dryers

Vacuum cleaners


Microwave ovens with fan-assisted heating

The standard specifies safety requirements for these appliances throughout their lifecycle, including design, manufacturing, installation, and use.

Main Safety Requirements

UL 60335-2-51 sets out several key safety requirements that manufacturers must adhere to. These requirements include, but are not limited to, the following:

Protection against electric shock

Appliances must be designed and constructed to prevent any risks of electrical shock to the user. This includes ensuring proper insulation, grounding, and adequate clearance between live parts and accessible surfaces.

Protection against mechanical hazards

Appliances must be designed to minimize any potential mechanical hazards during normal operation. For example, rotating components like washing machine drums must be appropriately guarded to prevent accidents or injuries.

Protection against thermal hazards

Appliances should be able to withstand high temperatures generated during normal operation without presenting any risk to users or causing damage to the surroundings. This can be achieved through proper insulation, cooling mechanisms, and temperature monitoring systems.

Protection against fire hazards

Appliances should be designed and manufactured to minimize the risk of fire. This involves using fire-resistant materials, adequate ventilation, and effective overheating protection mechanisms.


UL 60335-2-51 plays a crucial role in ensuring the safety and reliability of household appliances with electric motors. By complying with this technical standard, manufacturers can produce appliances that meet stringent safety requirements and provide consumers with peace of mind. It is important for both manufacturers and consumers to be aware of UL 60335-2-51 to promote a safer living environment and reduce the risk of accidents or injuries caused by faulty appliances.


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