Electronic load input circuitry and mains earth isolation

[electricar]

Hey folks,

I’m designing my own electronic dc load and am wondering if anybody can show me the right input circuitry. I know from several designs, that you should take into account the inductance of the leads from your power supply to the dc load. This is e.g. done with a RC-snubber (e.g. 1R and 4,7uF in series from the positive dc load input to the negative).
You can see in Dave’s #862 - BK Precision 8601 DC Electronic Load video that there are two 1R power resistors and also two big capacitors (see "BK Precision Load Input Components.PNG"). Where do you have to place the second snubber? Is this simply in parallel to the first one?
Also there are two MOVs and two other capacitors. Does anybody know where they are exactly placed (I assume between the positive and negative load inputs)?
Do you know how to dimension them and what the exact purpose is? I assume classic ESD and transient protection on the inputs?

Another question is concerning the isolation of the load inputs and the mains earth and the connection between them.
On the HP 6060B electronic load there is this connection (see "HP 6060B Input Circuitry.PNG").

Mains earth and the positive floating load input (+BUS) are connected through a 22nF 250VAC capacitor. Mains earth and the negative floating load input (-BUS) are connected through a 22nF 250VAC capacitor and a 10Meg resistor in parallel.
What is the purpose of this connection? Okay, it’s not a direct connection of the negative terminal and mains earth, but is this enough high impedance to be called “floating”?

If I connect a mains earthed power supply to those “floating” inputs, the isolation of the primary interface (mains earth referenced) and the secondary interface (floating) from the block diagram (see "HP 6060B Block Diagram.PNG") will be bridged, won’t it?
Could this lead to any unintended function states?

Thank you very much in advance!
electricar