Questions tagged [creepage]
Creepage is the separation between two conductors as measured along the surface/layers of a board
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Galvanically isolated voltage PCB track clearance requirements
I am designing a PCB to switch high voltage (440VAC) from a microcontroller.
In this project, the 440VAC voltage is galvanically isolated from the microcontroller circuit. I am using an opto-coupler ...
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1answer
39 views
Creepage and Clearance for Connectors
I’m looking to mount SMT pogo pins on a PCB. The connectors will see a maximum working voltage of 120VDC between any two pins, but only when connected to their corresponding female header.
If the ...
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1answer
35 views
Does recommended creepage distance apply to copper planes under soldermasks?
I have a design that requires around 0.5mm of creepage distance between conductors.
TI said in this video that "creepage is the shortest distance between two uninsulated conductors along the ...
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1answer
155 views
IEC 61010 table for creepage distances
Good day
I am making a pcb layout that is required to comply with the IEC 61010-1. In the standard, there is a table for clearances and creepages, which depends on working voltage, pollution degree ...
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56 views
Required creepage distance & clearance in high temp. (600~1000℃) for high voltage DC system (400V)
We have a high voltage battery pack. During abuse test, the Li-ion cells will eject lots of hot gas and graphite. These ejection will cause short circuit which is definitely not wanted. I want to know ...
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29 views
Can creepage distance be separated into more sections?
Can I count that the creepage distance of two separate circuits can be divided into two sections, while the inner conductive pad/track is isolated/floating?
Similarly, can I use two resistors (200V ...
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1answer
133 views
for calculating the number of insulator disks needed for creepage is line to line voltage or phase voltage used?
For example, I am calculating the number of disks required for a 330kV line. Assuming medium pollution (20mm/kV) and each disk having 405mm would my number of disks be 17 (based off line voltage) or ...
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2answers
183 views
Does silkscreen help with voltage creepage distance?
I have seen on various mains powersupply PCBs that they have a lot of silkscreen lines near the high voltage areas. So my question is that does the silkscreen helps rise the voltage rating of that ...
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195 views
IEC60950-1 - Does soldermask reduce creepage to pollution degree 1?
Since creepage distance requirements across a PCB are at least partially due to the potential of conductive pollution, is soldermask a sufficient coating to reduce fully covered traces to pollution ...
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1answer
156 views
Clearance and creepage for AC Optocoupler for 230V line detection
I was wondering how I need to handle clearance and creepage in this scenario.
It's AC mains line detection circuit.
I need to achieve around 2.5mm creepage.
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3answers
644 views
Why does increasing altitude (low air pressure) results in lower resistivity/ breakdown voltage?
I got this question because the creepage and clearance distances need to be adjusted for altitude. The higher the altitude, the higher the distances should be. It seems to me however that the contrary ...
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42 views
Heatsink Crossing Primary and Secondary Sides in Switched-Mode Power Supply
I've taken apart a non-oem laptop power supply. There is clearance on the board between primary and secondary. However, they've placed a single heatsink across the board for the primary and secondary ...
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107 views
Proper implementation of creepage and clearance in high voltage PCB
I am designing a 3phase voltage detector based on optocouplers as shown below:
simulate this circuit – Schematic created using CircuitLab
For this I need to follow DIN 60664-1 and my biggest ...
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1answer
315 views
Barrier and slot within reduced area on a PCB
Imagine this situation in a little area of your PCB:
According to the worst case and used material, I need a creepage distance = 30mm. According some tables, clearance must be 30mm. First Red banana ...
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5answers
442 views
When to use slots instead of barriers in high voltage design?
I have read a lot of information about the clearance and creepage strategies, distances, materials, etc..
I am designing my first HV PCB, main LV circuit will be on TOP and HV (6KV) on the bottom. ...
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1answer
393 views
How can be creepage between two conductor points be determined for HV pcb design?
I have read about spacing at HV design and it seems to say that there are two main standards to be followed: IPC or UL (IEC). IPC is a generic and commonly used. But UL is the best option for designs ...
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166 views
crossing 240 V traces on both top and bottom sides of a 2 layer PCB
My situation is the same as the crossings encircled in white from Can I place 220V Live traces on top and bottom of PCB?
Therefore, running Line traces on the top layer and Neutral traces on
the ...
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1answer
55 views
Clearance distance and resin filler
I'm designing a circuit to detect presence of AC line voltage. It's actually a very simple device with AC side made up of a 200Kohm 1W resistor and an optocoupler and a protection diode.
There will be ...
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2answers
117 views
Creepage on SMT DIP package with an NC pin
I'm having trouble understanding how the CPC1972GSTR can have the specs it does.
Here's the datasheet.
In particular, it has a blocking voltage spec of 800V, but if you look at the recommended ...
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2answers
916 views
Maximum allowable voltage between PCB traces
I have some confusion regarding the guidelines for clearance between surface uncoated PCB traces (specifically component pads). IPC-2221 guidelines and other guidelines and standards indicate spacings ...
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2answers
464 views
High Voltage Capacitor Lead Clearance
I am designing a high voltage board, 10,000 VDC. I wish to use a suitably rated capacitor such as the DHR4E4A102K2BB. When I have been studying the ...
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2answers
604 views
Creepage distance over pcb
How to measure creepage distance over pcb ?
Is creepage and clearance distance measure by pbc layout or soldering?
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1answer
69 views
Insulation of SiC Diode
I am reading about creepage distance and clearance and came across a T0-247-3 SiC diode (IDW20G120C5B). This diode is rated for 1.2kV which would mean that it won't break down at let's say 800V, which ...
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1answer
544 views
Creepage distance get from UL840 note
I'm considering on creepage distances on my PCB. I have read UL840,there are two significant tables. 6.1 "Minimum acceptable creepage distances" and 6.2 "Minimum acceptable creepage distances on ...
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1answer
294 views
Proper way to route high-voltage tracks near THT components
I think this is not a duplicate of this question.
My design has the following constraints:
type and position of connectors
pinout assignments
260 VDC / 2A for high-voltage tracks
12V / 200 mA for low-...
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0answers
193 views
Creepage and clearance of through hole resistor
Recently I found a resistor broken on a PCB. It is a MOF type 1/2W through hole resistor. I found that the resistor is directly placing (touching) on a PCB Live trace and I know that the potential ...
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0answers
224 views
Becoming crazy with EU LVD regulation in PCB and electric strength
First of all I will explain the design characteristics of my project to make clear what it is and where it enters for regulation.
It is a fixed electric/electronic installation in offices so it can'...
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1answer
534 views
How to define working voltage class net to calculte the creepage?
I work of a project of single phase PFC converter and I need to define the working voltage to each each NET of Schematic to calculate creepage distance.
I have a question about the low voltage of NET ...
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0answers
708 views
Low Voltage PCB Creepage Requirements
Both 60950 (Table 2N – Minimum creepage distances) and 60335 (Table 18 – Minimum creepage distances for functional insulation) seem to specify a minimum creepage distance of 0.4mm (~16mil) with a IIIa ...
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2answers
3k views
Will a cut or a slot in a PCB change clearance or creepage?
Does a cut or a slot in a printed circuit board increase clearance, creepage or both?
Some say it will increase clearance, but I don't think clearance will change because, even with a cut in the PCB, ...
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1answer
2k views
How to measure creepage distance?
What points do you need to measure in PCB according to IEC 601? Is it the closest distance between any conductive parts? For example minimum air clearance for means of operator protection in secondary ...
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0answers
368 views
What is the common cause of short circuit in PCB design
In PCB design there is some clearance and creepage distances to respect according to the UL 60950 standard for example, I want to know why this distances need to be respected in PCB design, what is ...
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1answer
2k views
Ethernet LED & Diffpair Clearance
How do you maintain creepage distance between diff pairs and the LED terminals on an Ethernet connector?
My understanding is that based on EN60950, for 250V IT equipment, the air clearance is 2mm and ...
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1answer
476 views
How does a fuse affect creepage reqirements?
I am designing a mains-powered device that has to comply with IEC 60079-15 (Non-incedive industrial eqipment). Creepage distances in this standard are inherited from IEC 60664, pollution degree 3. For ...
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1answer
696 views
pollution degree and creepage distance
I read in some books that pollution degree can influence the creepage distance in electronic circuits, is there any relation (mathematical) between the pollution degree and the creepage distance.
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1answer
3k views
Clearance and creepage requirements in EU
I'm looking for the clearance and creepage requirements between live voltage (230V) and SELV (Safety Extra Low Voltage) in the EU.
I had a look at this and other questions, but I rarely see numbers ...
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1answer
16k views
Clearance rules for outer/inner layers?
I found some information about general creepage and clearance distances here but it doesn't mention what is OK for inner layers, which are insulated and not subject to contamination the way outer ...
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2answers
1k views
Creepage and clearance when using relays
I'm looking at this 10A, 277VAC relay and wondering if there is sufficient spacing between the low voltage (3.5V, 100mA) and the high voltage(277VAC, 10A). The foot print looks like this:
Are the 5V ...
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2answers
3k views
High Voltage PCB
I am building a test probe PCB to test 75-115V. What is the minimum distance between traces that I should adhere to when building my PCB? I will have ground, 3v and 115V traces running next to each ...
