What Is The Meaning Of Creepage Distance?

A proper and adequate creepage distance protects against tracking, a process that produces a partially conducting path of localized deterioration on the surface of an insulating material as a result of the electric discharges on or close to an insulation surface.

How do you calculate creepage distance?

How to Determine Creepage Distance for Connectors

  1. Creepage Distance/Air Gap: The Path of Least Resistance. …
  2. Check the Pins on the Connector Face. …
  3. Check the Backside of the Connector: …
  4. Check Female Contacts as well: …
  5. Check For Hidden Creepage Paths Inside the Connector. …
  6. Check for Hidden Creepage Paths Outside the Connector.

What is creepage current?

Creepage is defined as the shortest distance between two conductive paths measured along the surface of a solid insulation. … Clearance is the shortest distance between two conductive parts measured through air, typically measured on a device package between pins under the body of the package.

What is creepage factor?

Creepage Factor (CF), is a global check of the overall density of creepage distance and is equal to l/A where: l is the total creepage distance of the insulator and A is the arcing distance of the insulator. For disc insulators the CF is determined for a string comprising at least 5 insulator units.

How does creepage differ from clearance spacing?

The parameters for pad-to-pad, pad-to-trace, trace-to-trace spacing—basically any spacing rule that is applied between conductive elements over an insulating surface—is creepage, not clearance. Spacing between conductive elements through air is clearance.

What is pollution degree?

The pollution degree describes the environmental influences such as dust, moisture and aggressive substances that can affect a device and its insulation. IEC/EN 60664-1 and VDE 0110-1 define four pollution degrees.

Why is creepage important?

The isolation required between parts with different operating voltages, to prevent against unacceptable risk, is the primary reason for the importance of creepage and clearance distances. … It is the shortest distance between two conductive parts, measured through air.

What is bushing creepage?

distance. Minimum nominal creepage distance is the shortest distance along the surface of an insulator between two conductive parts. In the case of bushings, this is the distance between the bushing top metallic dome/terminal and the flange, which is referred to in terms of mm/kV, Fig.

What is dry arc distance?

Dry arcing distance (or arc distance) Dry arcing distance is the shortest distance outside the insulator along the air not along the insulator body and between those parts which normally have the operating voltage between them. … Arcing distance is also called as flash over distance.

What is creepage insulator?

The creepage distance for insulators is the shortest distance along the insulator surface between the metal parts at each end of the insulator. Creepage distance can also be refer as leakage distance for insulators.

What do you mean by creepage distance of an insulator?

The creepage distance is an important parameter of the insulator that affects the safe operation of transmission lines. It refers to the shortest distance between two electrodes along the outer surface of the insulating member under a normal operating voltage.

What is protective creepage?

Creepage and Clearance are international compliance terms commonly referred to as “Over- Surface” and “Through-Air” Electrical Spacings in the US and Canada. Creepage & Clearance distances form part of the product’s electrical insulation system that protects the user from a Risk of Shock.

What is overvoltage category II?

Category II describes transients that could be applied to equipment supplied from a fixed installation. In a domestic context, for example, appliances designed to be plugged into wall outlets in the house, such as power tools, televisions, or similar must be able to withstand category II overvoltage.

What IEC 60947?

IEC 60947-1:2020 applies, when required by the relevant product standard, to low-voltage switchgear and controlgear hereinafter referred to as “equipment” or “device” and intended to be connected to circuits, the rated voltage of which does not exceed 1 000 V AC or 1 500 V DC.

What is pollution geography?

Pollution is the introduction of harmful materials into the environment. Landfills collect garbage and other land pollution in a central location. … Pollution is the introduction of harmful materials into the environment. These harmful materials are called pollutants. Pollutants can be natural, such as volcanic ash.

What is the difference between clearance and distance?

As nouns the difference between distance and clearance

is that distance is (lb) the amount of space between two points, usually geographical points, usually (but not necessarily) measured along a straight line while clearance is the act of clearing or something (such as a space) cleared.

What is protected creepage distance?

Protected creepage distance of an insulator means part of the creepage distance on the illuminated side of the insulator which would lie in shadow if light were projected on to the insulator at 90°(or 45°in special cases) to the longitudinal axis of the insulator.

What is reinforced insulation?

The reinforced insulation is an improved basic insulation with such mechanical and electrical properties that, in itself, the insulation provides the same degree of protection against electrical shock as double insulation. … The reinforced insulation has the same level of insulation just like a double insulation.

What is clearance and creepage in PCB?

Creepage is the shortest distance between conductor traces on a PCB along the surface of the insulation material while clearance is defined as the minimum distance through the air (line of sight) between two conductor traces. Clearance and creepage distances between two PCB conductors.

What is creepage in PCB?

Creepage – Creepage is the shortest distance to another conductor along the surface of the insulating material of your PCB. … This is because at higher voltages conductors can arc to one another or to other components if they’re too close together.

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