How to power a Raspberry Pi

[rich2202]

Originally Posted by Al Skierkiewicz

Yes, but the rules do allow you to feed two VRM by splicing the leads together.

I presume that "same position that the VRM is wire from the PDP" means the VRM/PCM connectors at the end of the PDP that is protected by the 20 amp mini fuse.

Per R44, "no other electrical load shall be connected to these PDP terminals". I presume that means "directly or indirectly".

Are you saying that 2 VRM's can be connected via a splice to the VRM/PCM power supply terminals at the end of the PDP?

I see that R48 lets you have 3 VRM/PCM's off one 20 Amp circuit, but I presumed that applied to the WAGO terminals, and not the special power supply terminals.

I had presumed that R44 intended to give extra headroom to the VRM providing power to the Radio, and the PCM that would be powering the Compressor.

Let's say that you wanted to connect 2 VRM's, and no PCM's. R44 would require you to use a splice (only a PCM can be connected to the other terminal). Why wouldn't you allow a VRM or PCM to be connected to the 2nd terminal (with the restriction that a PCM could not be spliced off). In other words, the allowable combinations would be:

1) VRM
2) VRM, PCM
3) VRM, VRM
4) VRM/VRM (via splice), PCM

[Al Skierkiewicz]

R44 is confusing. It begins with saying the VRM supplying the radio must be connected here and it allows that one PCM may also be connected at that point.
R44 does go on to say "no other electrical load shall be connected to
these PDP terminals". So I gave you wrong info.
If it were me, I would not power a VRM, a PCM on a single 20 amp fuse. My recommendation would be to power additional VRMs and PCMs separately from two 20 amp breakers. Most compressors exceed 20 amps in start.