What is difference between IEC60332 and 94ULV0

IEC 60332 and UL V0 are two different standards for testing the flame retardant performance of cables, with the main differences being the testing methods, application scenarios, and flame retardant level requirements.
IEC 60332 standard
Scope of application: The vertical burning test standards for bundled cables developed by the International Electrotechnical Commission (IEC) are divided into three categories: A, B, and C, used to evaluate the flame retardant performance of bundled cables under vertical burning conditions.  ‌
Test conditions:
Sample: Multiple cables with a length of 3.5 meters are bundled and installed on the sample ladder, vertically placed in the test box.
Combustion intensity: 20.6kW gas 

burner for vertical fire supply.
Fire supply time: 40 minutes for Class A/B and 20 minutes for Class C.
According to the standard, the carbonization height should not exceed 2.5 meters.  ‌

UL V0 standard
Scope of application: The vertical burning test standard for single cables developed by Underwriters Laboratories (UL) in the United States is used to evaluate the flame retardant performance of single cables.  ‌

Test conditions:
Sample: A single 60cm long cable is vertically fixed.
Burning intensity: A propane burner with a flame length of 175 millimeters contacts the specimen at a 45 degree angle.
Fire supply time: 20 minutes.
According to the standard, the distance betw

een the burned damaged part and the fixed end should not exc

eed 50 millimeters.  ‌
 

core difference
Test object: IEC 60332 for bundled cables, UL V0 for single cables.
Fire supply method: IEC 60332 is vertical fire supply, UL V0 is 45 degree inclined fire supply.
Application scenarios: IEC 60332 is more closely related to practical engineering applications (such as bundled laying), while UL V0 is suitable for general scenarios of single cable.  ‌