Capacitor Clearance

What is the minimum clearance distance for an electrical device?

Consider an electrical device with a working voltage of 250 V AC and a pollution degree of 2. To determine the minimum clearance distance, we can refer to Table 1 below, which is adapted from the IEC 60664-1 standard: Based on the table, the minimum required clearance distance for our example is 1.5 mm.

What if a capacitor is +20 % tolerance?

If the capacitors are +-20 % tolerance, you must assume +20 % one one and -20 % on the other, and the one with the lower capacitance will see significantly higher voltage for any AC signal. For DC, it’s only the leakage which determines the distribution, and it’s almost never guaranteed.

What is a good lead spacing for a 10kV rated capacitor?

When I have been studying the IPC-2221 and IEC 61010 standards the conductor clearance should be in the order of 0.00305 mm/volt, therefore you would think that for a 10kV rated capacitor the lead spacing should be at least 30.5mm. However, when looking at many datasheets they are around 9.5mm +/-2mm.

How much clearance should a connector have?

If the associated clearance is less than 3 mm, the minimum slot width can be reduced to 1/3 of the clearance. The maximum voltage to be applied to the connector depends on the distance between two connections. Clearance = shortest distance between two conductive parts (in air) Creepage distance = distance along surface

Does Murata have a creepage distance over a capacitor?

You still have the creepage distance over the capacitor surface to contend with- it's probably not adequate unless you coat the board or pot the circuit. By the way, that Murata part has a final order date of 'September 2019, meaning it is marked to be permanently discontinued.

How much clearance should a PCB have?

Connectors, canned capacitors and crystals should have a clearance of 0.5mm, in addition to the clearance required for mating of the connector. BGA devices should have a clearance of 1.0mm. Best practices on PCB layouts to ensure that sufficient component clearance is provided for the assembly process and avoid component touching.