Questions tagged [clearance]

Clearance denotes the shortest distance between two conductive parts as measured through the air.

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5
votes
1answer
448 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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vote
1answer
671 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.
1
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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 ...
13
votes
5answers
20k views

Cleaning PCBs… using water?

I found this video where a technician with a lot of experience seems to clean his PCBs using water, and then he just puts it in the sun so it can dry. I was just amazed to see the circuit keeps ...
1
vote
1answer
5k views

Eagle Clearance Error on DS2784

I am using the CAD drawing for the DS2777 from Maxim Integrated. http://www.maximintegrated.com/en/design/packaging/cad/?phase=proc&return_url=http%3A%2F%2Fwww.maximintegrated.com%2Fen%2Fdesign%...
9
votes
1answer
15k 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 ...
2
votes
1answer
513 views

PCB clearance on eagle to make coplanar lines

I need to define a clearance between my signal path and souronding ground of 0.16mm in Eagle PCB layout. I tried to setup the "isolate" at 0.16 and do "ratsnets" but it keeps the same distance as ...
3
votes
2answers
364 views

Minimum distance from TQFP to chip cap on PCB assembly?

I want to put decoupling caps (0603) as close as possible to TQFP-48-7x7. So PCB/assembly wise how close I can put them (pad to pad, component to component)? Does the 'court yard' need to be exactly ...
12
votes
5answers
35k views

How do I disable clearance check for a layer or for only some certain elements?

I'm designing a PCB in Altium Designer. There is a very large heat sink in my project. When I put it on the PCB, there will be plenty of empty space under it where I can put other small components. I ...
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 ...
3
votes
2answers
12k views

EAGLE PCB How to set drill clearance?

I have designed an land pattern for a micro USB connector. The connector have 2 x 0.9mm drill holes under it. The problem is the clearance distance around these holes being to big and overlaps the ...
5
votes
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 ...
10
votes
3answers
28k views

How to change polygon clearance in Altium

In Altium, when I draw a polygon, it automatically leaves a gap around copper of a different net. However, my Vin net is high voltage, and needs to have a 1mm clearance. Therefore, If I draw a Vin ...

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