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How much clearing for a PCB?
How much clearing for a PCB?
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Old 14th November 2019, 12:52 PM   #1
Nocturna81 is offline Nocturna81  Netherlands
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Default How much clearing for a PCB?

So I was wondering the following: what is the minimal safe distance for a trough hole pcb to be mounted on a metal enclosure? The pcb will have 12V running through it with at most 2.5A so nothing too exciting.

Hope anyone can answer this one!
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Old 14th November 2019, 12:56 PM   #2
nenad88 is offline nenad88  Serbia
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Standard hex standoff size.
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Old 14th November 2019, 01:14 PM   #3
Nisbeth is offline Nisbeth  Denmark
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How much clearing for a PCB?
Not sure there is a standard for 12V? For 230VAC mains the clearance requirement is 6mm IIRC.
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Old 14th November 2019, 01:14 PM   #4
Nocturna81 is offline Nocturna81  Netherlands
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Quote:
Originally Posted by nenad88 View Post
Standard hex standoff size.
Ehr, which would be? I have them as small as 5mm
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Old 14th November 2019, 01:18 PM   #5
OlegSh is offline OlegSh
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How much clearing for a PCB?
I typically use 8 or 10 mm long hex standoffs depending on how tight I want it to be. You just have to make sure that long protruding component leads do not come too close to the enclosure bottom even if the PCB or the bottom cover bends due to various use or handling conditions.

Regards,
Oleg
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Old 14th November 2019, 01:21 PM   #6
OlegSh is offline OlegSh
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How much clearing for a PCB?
With 5mm standoffs one can run into problem that standard 5~6mm long screws are too long to tighten.
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Old 14th November 2019, 01:26 PM   #7
Nocturna81 is offline Nocturna81  Netherlands
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Quote:
Originally Posted by OlegSh View Post
I typically use 8 or 10 mm long hex standoffs depending on how tight I want it to be. You just have to make sure that long protruding component leads do not come too close to the enclosure bottom even if the PCB or the bottom cover bends due to various use or handling conditions.

Regards,
Oleg
That's actually a good one, hadn't thought about that!
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Old 14th November 2019, 08:14 PM   #8
Mark Tillotson is offline Mark Tillotson
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Adding insulation on the inside of the case can be useful if clearance might be iffy - but not gaffa tape(!). I've used kapton tape for this in small diecast boxes.
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Old 14th November 2019, 08:28 PM   #9
olsond3 is offline olsond3  United States
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Heavy parts in the middle of the board and dropping it while powered on can get exciting if there isn't sufficient clearance. I just assume everything gets pulled off the table by someone tripping on the cable.
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Old 15th November 2019, 12:44 AM   #10
MAAC0 is offline MAAC0  Portugal
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If You use a long screw say 20mm You can add 2 or 3 female screws to adjust the height. I usually use 3 between chassis and PCB.
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