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How much would an EMP that disables all vechicles, walkers, titans and planes in the target area affect power- and terminator armour?
Do they have built in backup systems?
And what weapons would still remain operational?
Could the SM/GK remove their armour if disabled and continue fighting without it?
How long can an SM survive in the vacuum/coldeness of space if the life upkeep systems of his power armour have failed?

Honestly I'm surprised the Tau haven't used some captured Imperial tech to find a way to use EMP or a computer virus to their advantage, particularly when it comes to the AI systems on the Land Raider/Rhino/etc.. Could just be that the Dark Age of Technology-era "Machine Spirits" (computer systems) on these machines are so high quality

1) See haywire grenades/missiles and extrapolate.
2) I don't recall them ever being mentioned, but redundant systems would make sense.
3) Presumably yes.
4) Space Marines can supposedly survive hard vacuum for 'a limited period'.

Most of these are really details which are down to artistic licence, since such situations seldom arise on the tabletop.

I'm thinking all imperial stuff must have Tempest Shielding built in. I guess Ceramite and Adamantine are impenetrable to EMP, so EMP Grenades need to be placed right on the hull of the tank itself to get through.

Power armor has been, if not designed, at least regularly used in space, exposed a lot of the old cosmic radiation. Terminator armor was based off a design of engineering armor used to protect engineers against space, power cores and other hostile environments. Both are going to come up against some form of ionising radiation at some point. Both are completely screwed if they just stop. They are going to be hardened as much as they can be and redundant where they can't, or its important. Unless there has been instances of power armor shutting down in the fluff, that I haven't read about?

Lots of military hardware in this millennium is shielded from EMP to some extent. I would imagine they would have that down by 40,999. Like the Good Doctor said, haywire grenades and the like only work in very close proximity, which we can attribute to the effectiveness of shielding.

As for removing armor and continuing to fight, there is support in some novels for marines putting on/taking off armor unaided. I'm more inclined to believe the illustrations showing a half dozen tech adepts and serfs practically building the armor around the marine. I don't think something like power armor could be so easily donned or removed. Short of ripping off a damaged glove or pauldron, I think a marine would have to tough it out in his damaged armor.

Marines can survive hard vacuum for short periods. There is a specific implant that controls this, something about modifying sweat glands to produce a waxy/resin substance that hardens in a cocoon around the marine. I imagine exposure to vacuum would trigger this, protecting the marine in case his armor was breached. Only problem is it triggers a sort of suspended animation that requires an apothecary to revive you. Somebody correct me if I'm wrong on any of this, but I believe there's a bit of fluff where a marine survived floating in space for years after his boarding torpedo was destroyed en route to an enemy ship, just hibernating in a resin cocoon until his chapter returned and found him.

PA and TDA is most likely shielded from EMP due to it functioning in solar radiation and who knows what Chaos tosses at you.

It's going to be hard to measure the EMP requirement because, quite simply, we dont know enough about the power armor and how it works. It works at least to some extent on electronics (the fibre bundles are electrical/electronic) it has batteries and/or a reactor that probably generate or releaes electricity, it has sensors and such which probably are electric or emit radiation of some kind. It doesnt help that there are differnet kinds of EMP as well (it can be generated nuclear and non-nuclear fashion, for example).. you protect basically by shielding (covering the exposed or vulenerable bits somehow - metal I understand is good for this) Or you make the components that are vulneable more robust and thus better able to endure the effects. In the case of Space MArine armor I imagine they can do both (The armor has metal, and I imagine the fibre bundles are metal sheathed to some degree to offer cutting resistance and durability, so they could be EMP resistant as well. Having the power source, capacitors, etc in the backpack would also put them in a well shielded locale.) There may be other problems (points of vulnerabilit yor means of protection) that I dont know about.

Your best bet for any sort of measurement is to look in the fluff for examples of nuclear detonations and similar cases. REsistance to lightning strikes or electricity may or may not provide some comparison as well.

It used to be possible to disable power armour with haywire grenades back in the day (when anti-plant, virus and vortex grenades also ruled).
Then you hit them with tanglefoot.
(messed up their co-ordination on top of halving their Mv).

And shot them for a couple of turns because they couldn't move.

Safor wrote:And what weapons would still remain operational?

Fists?

Most weapons seem to include some kind of electronical device ... if you go by GW, even the boltguns with their chemically propelled projectiles are fired via electric impulse.

Safor wrote:Could the SM/GK remove their armour if disabled and continue fighting without it?

For power armour, they might not need to - at least if you subscribe to studio fluff. If you go by the 2E Angels of Death Codex, moving in disabled power armour is "only" difficult for a Marine, but not impossible. But ... see chromedog.

As for putting it on or taking it off ... I'm not sure. That it takes half a dozen serfs for a Marine to put on his armour may well be simple tradition, but not necessary - similar to many medieval knights. On the other hand, depending on how/where the armour closes, it may well be that it's rather difficult for an Astartes to unlock it. The suit is quite bulky due to all the subsystems it contains, so getting your arms around it to reach all those little connectors may be quite a bit of work.
I could imagine there to be many different interpretations, depending on which novel you look at.