I have 1/2" rigid conduit, can I run 12 AWG through it for a length of about 6'? It will be a single cable pull, and it has one 90 degree bend.

Code is mute on running NM in conduit, yet you would need to do a conduit fill calculation to see if what you are trying to install will meet code.

Here it is in a nut shell:
If you are just sleeving (protecting) the NM for six feet, I say go for it (recommend 3/4" conduit).<-----Note: in this case, both ends of the conduit are open. Yet, if you are running the conduit from box to box, then use THHN.

Here is the situation... I have an outlet in my kitchen that is currently served with 14 awg wire, no ground (and the conduit is not grounded). I want to install a new grounded 20 amp receptacle, easiest way is to fish the wire from the basement to outlet (6' ish). The conduit will be attached to the box in the kitchen but will be open in the basement where I'll be tapping into an existing 20 amp kitchen circuit.

If I were to run individual wires through the conduit I would then need a new junction box in the basement to tap into the romex, correct? Quicker and easier to do the romex in the conduit, but I'll do the calcs to see if I'm within code.

You never mentioned what type of conduit. Yet, I'm going to assume it's emt. If my assumption is correct, then you should be fine with one 12-2 NM-b in 1/2 EMT conduit. "Very tight fit"! Yet, I still recommend you pull #12Thhn. To add: RNC (Sch 80) and ENT will not work . You will have to up size to 3/4".

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If I were to run individual wires through the conduit I would then need a new junction box in the basement to tap into the romex, correct?

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Yes, and the Junction box will have to be accessible.

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I want to install a new grounded 20 amp receptacle

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If you plan to install a recptacle in a kitchen, then see my post here: https://www.askmehelpdesk.com/electr...nt-219313.html

Please note that in the forum room I listed above, it speaks on the kitchen receptacle requirements. Note: Code says no fewer than two small appliance circuits. This means you have to have two, yet it also means you can have more than the two required.



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