Spacing Calculator (for UL 60730-1)
Declare by Power System
Enter Line-to-Neutral Voltage Directly
Power System (from Standard):
Nominal Voltage System:
Line-to-Neutral Voltage (V):
Rated voltage (V) for Basic Insulation Creepage:
Working Voltage (V r.m.s.) for Functional Insulation:
Overvoltage Category:
I
II
III
IV
Pollution Degree:
1
2
3
4
Material Group:
Group I (PTI/CTI ≥ 600; CTI Index 0)
Group II (400 ≤ PTI/CTI < 600; CTI Index 1)
Group IIIa (175 ≤ PTI/CTI < 400; CTI Index 2, 3)
Group IIIb (100 ≤ PTI/CTI < 175; CTI Index 4)
Altitude (sea level):
≤ 2000 (Standard condition)
2000 (No correction)
3000 (Factor: 1.14)
4000 (Factor: 1.29)
5000 (Factor: 1.48)
6000 (Factor: 1.70)
7000 (Factor: 1.95)
8000 (Factor: 2.25)
9000 (Factor: 2.62)
10000 (Factor: 3.02)
15000 (Factor: 6.67)
20000 (Factor: 14.5)
Clearance Case:
Case A
(Inhomogeneous Field)
Case B
(Homogeneous Field)
Application Type for Creepage:
Printed Wiring Material (PCB)
Plastic Material
Calculate