Questions tagged [creepage]
Creepage is the separation between two conductors as measured along the surface/layers of a board
29
questions
5
votes
3answers
369 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 ...
1
vote
0answers
35 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 ...
1
vote
0answers
50 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 ...
5
votes
1answer
146 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 ...
2
votes
5answers
222 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. ...
3
votes
1answer
176 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 ...
0
votes
1answer
142 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 ...
0
votes
1answer
49 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 ...
2
votes
2answers
65 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 ...
1
vote
2answers
327 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 ...
6
votes
2answers
305 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 ...
1
vote
2answers
469 views
Creepage distance over pcb
How to measure creepage distance over pcb ?
Is creepage and clearance distance measure by pbc layout or soldering?
3
votes
1answer
65 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 ...
1
vote
1answer
281 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 ...
2
votes
1answer
220 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-...
0
votes
0answers
153 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 ...
2
votes
0answers
199 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'...
2
votes
1answer
437 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 ...
2
votes
0answers
583 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 ...
8
votes
2answers
2k 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, ...
-1
votes
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 ...
1
vote
0answers
367 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 ...
5
votes
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 ...
5
votes
1answer
397 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 ...
1
vote
1answer
641 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.
0
votes
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 ...
9
votes
1answer
14k 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 ...
3
votes
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 ...
5
votes
2answers
2k 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 ...
