-
Categories
-
Platforms
-
Content
There is a language problem here. Please try again.
Pour means to flow a liquid or slurry. Concrete and wine are poured.
Poor means insufficient.
If wires comming through a printed circuit board are touching a grounded area then there will be strange effects, possibly damaging.
If the circuit is at high voltage, then proper clearances are essential for safety.
Pour means to flow a liquid or slurry. Concrete and wine are poured.
Poor means insufficient.
If wires comming through a printed circuit board are touching a grounded area then there will be strange effects, possibly damaging.
If the circuit is at high voltage, then proper clearances are essential for safety.
I mean copper pour
http://www.wisegeek.com/what-is-a-copper-pour.htm
What I mean is if the plastic underside of the component can touch copper. Voltage is 12V.
http://www.wisegeek.com/what-is-a-copper-pour.htm
What I mean is if the plastic underside of the component can touch copper. Voltage is 12V.
Last edited:
Arouse1973
Adam
We do this all the time when we design PCBs. You are referring to a power plane of some sort I guess? If you are having your PCB manufactured professionally and you have solder resist put on as a protective coating then this should be fine. Although more expensive It is quite common practice to have spacers for some components which as Duke mentioned will help with PCB flex on larger boards. Resistors on the other hand can be formed with a kink in the legs which will ensure they just clear the PCB. Most of the time though resistors are touching the PCB and when soldered in place. Larger components like power diode and resistors might need to be elevated to stop them wearing away the resist in applications of low to moderate vibration. This gap also helps with cleaning of the PCB so the cleaning fluid can get under the components.
Adam
Adam
If you want a good idea where it's not, look here:
The large silver area is where a failure took off the solder mask. The failure was of a capacitor connected across the mains. That solder mask is connected to circuit (and mains) ground.
When the capacitor failed, it *may* (it did not, as it happened) have produced some connection between mains active and circuit ground. In this case that would have tripped an ELCB, but in other cases it might have had worse results.
It is important that you maintain adequate clearances, and that depends on the voltage. The ground plane may be fine around the relay coil contacts, but unless it is connected to protective ground, I would keep it well away from 230VAC. If it is absomutely required for shielding, then you MUST observe the requirements for creepage and clearance.
The large silver area is where a failure took off the solder mask. The failure was of a capacitor connected across the mains. That solder mask is connected to circuit (and mains) ground.
When the capacitor failed, it *may* (it did not, as it happened) have produced some connection between mains active and circuit ground. In this case that would have tripped an ELCB, but in other cases it might have had worse results.
It is important that you maintain adequate clearances, and that depends on the voltage. The ground plane may be fine around the relay coil contacts, but unless it is connected to protective ground, I would keep it well away from 230VAC. If it is absomutely required for shielding, then you MUST observe the requirements for creepage and clearance.
