每500伏特的安全距离为1MM左右呢？

平常打高压，是否可以这么理解，每500伏特的安全距离为1MM左右呢？初级对地爬电距离3MM，空间距离1.5MM呢？是否正确。

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隐形专家

LV.10

2010-11-20 22:47

wuzhonggui

LV.9

2010-11-20 22:56

@隐形专家

[图片]

一、安全间距

1. LN之间3mm以上，空间距离1.8mm以上，不足时开1mm以上的槽增加沿面距离。

2. 初次级间6.4mm以上，空间距离5mm以上，不足时开1mm以上的槽增加沿面距离。

3. 初级与外壳地4.5mm以上，空间距离3mm以上，不足时开1mm以上的槽增加沿面距离。

4．高压与地之间铜箔距离1mm以上，其它无要求铜箔间距离0.5mm以上。

wuzhonggui

LV.9

2010-11-20 23:00

@wuzhonggui

一、安全间距1. LN之间3mm以上，空间距离1.8mm以上，不足时开1mm以上的槽增加沿面距离。2.初次级间6.4mm以上，空间距离5mm以上，不足时开1mm以上的槽增加沿面距离。3.初级与外壳地4.5mm以上，空间距离3mm以上，不足时开1mm以上的槽增加沿面距离。4．高压与地之间铜箔距离1mm以上，其它无要求铜箔间距离0.5mm以上。

这是IEC-60950的空间和爬电距离要求：附表2J – AC交流电源瞬间电压（摘录标准表2J）
AC main supply voltage up to and including ^a				Mains transient voltage Vpeak ^b
AC main supply voltage up to and including ^a				Overvoltage category
Vr.m.s				I						II
50				330						550
100				500						800
150 ^c				800						1500
300 ^d				1500						2500
600 ^e				2500						4000
a For equipment designed to be connected to a three-phase, three-wire supply, where there is no neutral conductor, the AC MAINS SUPPLY voltage is the line-to-line voltage. In all other cases, where there is a neutral conductor, it is the line-to-neutral voltage.
b The MAINS TRANSIENT VOLTAGE is always one of the values in the table. Interpolation is not permitted.
c Including 120/208 V and 120/240 V.
d Including 230/400 V and 277/480 V.
e Including 400/690 V.
In general,CLEARANCES in equipment intended to be connected to the AC MAINS SUPPLY shall be designed for Overvoltage Category II.
如果所测的工作电压峰值超过下表规格时，上述空间距离的值需增加下表所列的对应值

附表2K – 一次电路以及一次电路与二次电路之间的最小电气绝缘（摘录标准表2K）
														Unit:mm
Peaking working voltage up to and including, V	Mains transient voltage
	1500						2500						4000
	Pollution degree
	1 and 2			3			1 and 2			3			1, 2 and 3
	F	B/S	R	F	B/S	R	F	B/S	R	F	B/S	R	F	B/S	R
71	0.4	1	2	0.8	1.3	2.6	1	2	4	1.3	2	4	2	3.2	6.4
210	0.5	1	2	0.8	1.3	2.6	1.4	2	4	1.5	2	4	2	3.2	6.4
420	F 1.5 B/S 2.0 R 4.0												2.5	3.2	6.4
840	F 3.0 B/S 3.2 R 6.4
The values in the table are applicable to FUNCTIONAL INSULATION (F) if required by 5.3.4 a) (see 2.10.1.3), BASIC INSULATION (B), SUPPLEMENTARY INSULATION (S) and REINFORCED INSULATION (R).
If the peak working voltages exceeds the peak voltage of the AC main supply voltage, linear interpolation is permitted between the nearest two points, the calculated minimum clearance being rounded up to the next higher 0.1 mm increment.

附表2L– 次电路中的附加间隙（摘录标准表2L）
														Unit:mm
Mains transient voltage
1500V								2500V
Pollution degree 1 and 2	Pollution 3		Functional basic or supplementary insulation			Reinforced insulation		Pollution degree 1, 2 and 3			Functional basic or supplementary insulation			Reinforced insulation
Peak working voltage up to and including, V			Functional basic or supplementary insulation			Reinforced insulation		Peak working voltage up to and including V			Functional basic or supplementary insulation			Reinforced insulation
210	210		0			0		420			0			0
298	294		0.1			0.2		493			0.1			0.2
386	379		0.2			0.4		567			0.2			0.4
474	463		0.3			0.6		640			0.3			0.6
562	547		0.4			0.8		713			0.4			0.8
For voltages above the peak working voltage values given in the table, liner extrapolation is permitted.

附表2N – 最小爬电距离（摘录标准表2N）
														Unit:mm
RMS working voltage up to and including , V	Pollution degree
	1		2		1		2				3
	Material group
	Printed boards				Other materials
	I, II, IIIa, IIIb		I, II, IIIa		I, II, IIIa, IIIb		I	II	IIIa, IIIb		I	II		IIIa, IIIb
10	0.025		0.04		0.08		0.4	0.4	0.4		1	1		1
12.5	0.025		0.04		0.09		0.42	0.42	0.42		1.05	1.05		1.05
16	0.025		0.04		0.1		0.45	0.45	0.45		1.1	1.1		1.1
20	0.025		0.04		0.11		0.48	0.48	0.48		1.2	1.2		1.2
25	0.025		0.04		0.125		0.5	0.5	0.5		1.25	1.25		1.25
32	0.025		0.04		0.14		0.53	0.53	0.53		1.3	1.3		1.3
40	0.025		0.04		0.16		0.56	0.8	1.1		1.4	1.6		1.8
50	0.025		0.04		0.18		0.6	0.85	1.2		1.5	1.7		1.9
63	0.04		0.063		0.2		0.63	0.9	1.25		1.6	1.8		2
80	0.063		0.1		0.22		0.67	0.9	1.3		1.7	1.9		2.1
100	0.1		0.16		0.25		0.71	1	1.4		1.8	2		2.2
125	0.16		0.25		0.28		0.75	1.05	1.5		1.9	2.1		2.4
160	0.25		0.4		0.32		0.8	1.1	1.6		2	2.2		2.5
200	0.4		0.63		0.42		1	1.4	2		2.5	2.8		3.2
250	0.56		1		0.56		1.25	1.8	2.5		3.2	3.6		4
320	0.75		1.6		0.75		1.6	2.2	3.2		4	4.5		5
400	1		2		1		2	2.8	4		5	5.6		6.3
500	1.3		2.5		1.3		2.5	3.6	5		6.3	7.1		8
Linear interpolation is permitted between the nearest two points, the calculated spacing being rounded to the next higher 0.1 mm increment. For reinforced insulation, the calculated value for basic insulation shall be doubled first before applying the rounding off.

我司产品一般使用“污染等级2，材料组别：IIIa或IIIb”
如果从表2N查得的爬电距离小于从表2K或2L或表2M（适用时）查的相应的电气间隙，则应采用所查得的该电气间隙值作为最小爬电距离的数值

ppfc_ctr

LV.6

2010-11-20 23:02

@wuzhonggui

这是IEC-60950的空间和爬电距离要求：附表2J–AC交流电源瞬间电压（摘录标准表2J）ACmainsupplyvoltageuptoandincludingaMainstransientvoltageVpeakbOvervoltagecategoryVr.m.sIII50330550100500800150c8001500300d15002500600e25004000a Forequipmentdesignedtobeconnectedtoathree-phase,three-wiresupply,wherethereisnoneutralconductor,theACMAINSSUPPLYvoltageistheline-to-linevoltage.Inallothercases,wherethereisaneutralconductor,itistheline-to-neutralvoltage.b TheMAINSTRANSIENTVOLTAGEisalwaysoneofthevaluesinthetable.Interpolationisnotpermitted.c Including120/208Vand120/240V.d Including230/400Vand277/480V.e Including400/690V.Ingeneral,CLEARANCESinequipmentintendedtobeconnectedtotheACMAINSSUPPLYshallbedesignedforOvervoltageCategoryII.如果所测的工作电压峰值超过下表规格时，上述空间距离的值需增加下表所列的对应值附表2K–一次电路以及一次电路与二次电路之间的最小电气绝缘（摘录标准表2K）　　　　　　　　　　　　　Unit:mmPeakingworkingvoltage uptoandincluding,VMainstransientvoltage150025004000Pollutiondegree1and231and231,2and3FB/SRFB/SRFB/SRFB/SRFB/SR710.4120.81.32.61241.32423.26.42100.5120.81.32.61.4241.52423.26.4420F1.5 B/S2.0 R4.02.53.26.4840F3.0 B/S3.2 R6.4 ThevaluesinthetableareapplicabletoFUNCTIONALINSULATION(F)ifrequiredby5.3.4a)(see2.10.1.3),BASICINSULATION(B),SUPPLEMENTARYINSULATION(S)andREINFORCEDINSULATION(R).IfthepeakworkingvoltagesexceedsthepeakvoltageoftheACmainsupplyvoltage,linearinterpolationispermittedbetweenthenearesttwopoints,thecalculatedminimumclearancebeingroundeduptothenexthigher0.1mmincrement.附表2L–次电路中的附加间隙（摘录标准表2L）　　　　　　　　　　　　　Unit:mmMainstransientvoltage1500V2500VPollutiondegree1and2Pollution3FunctionalbasicorsupplementaryinsulationReinforcedinsulationPollutiondegree1,2and3FunctionalbasicorsupplementaryinsulationReinforcedinsulationPeakworkingvoltageuptoandincluding, VPeakworkingvoltageuptoandincludingV21021000420002982940.10.24930.10.23863790.20.45670.20.44744630.30.66400.30.65625470.40.87130.40.8Forvoltagesabovethepeakworkingvoltagevaluesgiveninthetable,linerextrapolationispermitted.附表2N–最小爬电距离（摘录标准表2N）　　　　　　　　　　　　　Unit:mmRMSworkingvoltageuptoandincluding,VPollutiondegree12123MaterialgroupPrintedboardsOthermaterialsI,II,IIIa,IIIbI,II,IIIaI,II,IIIa,IIIbIIIIIIa,IIIbIIIIIIa,IIIb100.0250.040.080.40.40.411112.50.0250.040.090.420.420.421.051.051.05160.0250.040.10.450.450.451.11.11.1200.0250.040.110.480.480.481.21.21.2250.0250.040.1250.50.50.51.251.251.25320.0250.040.140.530.530.531.31.31.3400.0250.040.160.560.81.11.41.61.8500.0250.040.180.60.851.21.51.71.9630.040.0630.20.630.91.251.61.82800.0630.10.220.670.91.31.71.92.11000.10.160.250.7111.41.822.21250.160.250.280.751.051.51.92.12.41600.250.40.320.81.11.622.22.52000.40.630.4211.422.52.83.22500.5610.561.251.82.53.23.643200.751.60.751.62.23.244.5540012122.8455.66.35001.32.51.32.53.656.37.18Linearinterpolationispermittedbetweenthenearesttwopoints,thecalculatedspacingbeingroundedtothenexthigher0.1mmincrement.Forreinforcedinsulation,thecalculatedvalueforbasicinsulationshallbedoubledfirstbeforeapplyingtheroundingoff.我司产品一般使用“污染等级2，材料组别：IIIa或IIIb”如果从表2N查得的爬电距离小于从表2K或2L或表2M（适用时）查的相应的电气间隙，则应采用所查得的该电气间隙值作为最小爬电距离的数值

IEC-60950的空间和爬电距离要求，资料很详细，收了谢谢