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This is fine if: You use ultra pure water (deionized and demineralized, the impedance should be in the MegΩ, with a water impedance tester) No components on the board are sensitive to humidity or wa …

Since there is an air gap (on DB9 the gap exists between the conductors on the back, on the pogo pins the gap exists between the pins) you would use creepage and clearance between two conductors for air …

You can then set the clearance. … You could do the whole component and create a component to component clearance in design rules\placment\component clearance, altium will use the 3d model to calculate the clearance. …

It would change the length of the clearance, so if the electrical design is in a rocket or a high altitude balloon (or airplane), then it's something to take into consideration. … Source: Teledyne: Paschen’s results Creepage and clearance simply define a minimum safe distance that conductors can be placed apart on the PCB to prevent arcing. …

Which UL insulation requirements (in terms of B/R/S) and which voltage level should be used to determine the creepage/clearance of the gap between the CIRCUIT COMMON (which connects to MAINS through a … See this question: What is the general rule of thumb regarding UL's creepage clearance regulation? And this one: How to define working voltage class net to calculte the creepage? …

Right click on the object and go to violations then wave the violation. You can't exclude an entire layer, only objects in that layer. If you don't want to do that then you will need to add a custom q …

The clearance is probably going to be the thing that determines the distance as any bare conductors, so creepage doesn't really matter. … Source: http://blog.optimumdesign.com/clearance-and-creepage-rules-for-pcb-assembly If we have a 5kV voltage being ran into a pcb (I know your voltage is larger but I don't have those numbers on hand) …

It really depends on what standard you need to adhere to. This involves whatever NRTL or ETL you'll take to get the product tested (if you do so). If you are going the NRTL route, you might be able to …

Also remember the difference, if you can't get the clearance distance you can increase it with barriers or gaps. This image says it best for creepage vs clearance. … Source: https://www.protoexpress.com/blog/importance-pcb-line-spacing-creepage-clearance/ …

The more via's you use in parallel the less inductance you have. Each via can be modeled as an inductor with a few 10's of nH. If you really want to find the inductance closely there are calculations …

Typically no, like you said RS232 distances are short. I have isolated RS232 but for a different reason, I had a sensitive analog board and I wanted to avoid any kind of ground loop. So if you need to …