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What is conductor spacing in PCB?
The two most important spacing distances are the shortest distance through air between any two conductors (clearance distance), and the linear distance traveled over the surface of the PCB between any two conductors (creepage distance). Both of these distances are determined by the voltage used on the PCB.
What is High Voltage PCB?
1.1 What is a high voltage PCB? In short, any PCB that runs at a much higher voltage than the normal rail voltage can call a medium or high voltage PCB. Boards like mains powered power supplies, Inverters, EV chargers, etc. fall into this category.
What is clearance in PCB?
Clearance – Clearance is the shortest distance in the air between two conductors. You can think of this as the line of sight distance between two mountain tops. Creepage – Creepage is the shortest distance to another conductor along the surface of the insulating material of your PCB.
How to calculate conductor spacing for high voltage PCB?
In high voltage PCB design, important design requirements are specified in the IPC-2221B standard. Note that IPC only specifies minimum conductor spacing values for voltages up to 500 V. Simple formulas are provided for calculating minimum conductor spacing values for voltages above 500 V.
Which is the standard for high voltage PCB design?
In high voltage PCB design, the important generic standard for PCB design is IPC-2221. Many important design aspects are summarized in this design standard, some of which boil down to simple mathematical formulas.
What are the minimum conductor clearances for PCB?
It is widely accepted throughout the world as a generic PCB design standard for commercial and industrial applications. The Table 6.1 of IPC-2221B specifies minimum required conductor clearances as a function of voltage, elevation level and the coating. Since their introduction in 1998, these numbers were never revised.
Why is line spacing important in high voltage circuit boards?
In high-density interconnect PCBs, maintaining a minimum line spacing between traces is quite a challenging task. Creepage and clearance distances of the traces become important at high voltages. Designing a high-voltage circuit board requires good knowledge of international safety standards and regulations such as IPC 2221A and UL 60950-1.