Technical Articles

What is IEC 60335-1 Standard?

1. Safety Standard IEC60335-1

IEC 60335-1:2010 deals with the safety of electrical appliances for household and similar purposes.

Table1 shows the comparison of requirement between IEC60335-1 and IEC60950-1 in terms of safety.

Table1 The comparison of requirement between IEC60335-1 and IEC60950-1 in terms of safety

#	Safety standard		IEC60950-1	IEC60335-1 200V	IEC60335-1 100V
#	Over voltage category		Ⅱ	Ⅱ	Ⅱ
1	Isolation voltage *1	Input - Output	3,000	2.4･U+2400	2,000
		Input - FG	1,500	1.2･U+950	1,000
		Output - FG	(500)	-	-
2	Creepage *2	200-250V　*3	2.5/5.0	2.5/5.0	2.5/5.0
		250-300V　*3	3.2/6.4	4.0/8.0	4.0/8.0
		300-400V　*3	4.0/8.0	4.0/8.0	4.0/8.0
3	Clearance *2	150-250V　*4	2.0/4.0	2.0/3.5	2.0/3.5
		250-300V　*4	2.0/4.0	2.0/3.5	2.0/3.5
		300-400V　*4	3.2/6.4	-	-
4	Leakage current	Hand-held	0.75mA	-	-
		Movable	3.5mA	-	-
		Stationary	3.5mA	-	-
		Portable class I appliances	-	0.75mA	0.75mA
		Stationary class I motor-operated appliances	-	3.5mA	3.5mA
5	Maximum temperature (Wire)	Type A	Less than 90℃	-	-
		Type E	Less than 105℃	-	-
		Type B	Less than 110℃	-	-
6	Temperature increasing (Wire)	Type A	-	Less than 65deg	Less than 65deg
		Type E	-	Less than 80deg	Less than 80deg
		Type B	-	Less than 85deg	Less than 85deg

*1:(U) Maximum working voltage
*2:(Basic isolation/Reinforced isolation)
*3:Listed voltage means working voltage.
*4:Listed voltage means working voltage in IEC60950-1, and rated input voltage in IEC60335.

2. IEC60335-1 compliance

(1) Creepage

Required creepage in IEC60335-1 is more strict than IEC60950-1 in some part.

(2) Temperature of wire

In IEC60950-1, type of wire is categorized by the absolute maximum temperature. In IEC60335-1, type of wire is categorized by the temperature increasing against temperature at 25ºC ambient temperature.