Both require excessively large masochism to pull those stiff, balky things. You can either use it as physical armor only (for which sched 40 PVC is inadequate), or you can use it in the conduit wiring method, however that requires excessively large conduit to meet the fill rules. You ARE allowed to run cable in conduit, in two modes. Cable in Conduit: Yes actually, but it sux I suspect it only made sense in context of that other question (you didn't get it out of NEC). ![]() I can't vouch for what "3-wire set" means. TLDR: you would need 3 conduits for #8 50A. I know it is not permissible for me to run NM cable through conduit and do not plan to do so. Is it permissible under the NEC for me to run all 6 hots plus one earth ground in the same conduit (in which case, from what I see, I can use 1" conduit), or do I have to have a separate conduit run for each "3 wire set"? The conduit fill tables seem to indicate it is permissible, but then I ran into that "3 wire set" language elsewhere which confuzzled me. when they say "3 wire set" do they mean something like 6/3 where you have two hots and a neutral and ground wire, or is 6/2 a "3 wire set"? I am unclear as to what exactly is meant by that. I read I can run #8 (rather than #6) THWN/THHN for a 50 amp circuit when the THWN/THHN is installed in conduit "as part of a 3-wire set". I've read through the NEC to attempt to ensure I will be compliant, but I am still unsure as some of the language is confusing. I would like to run the wires from my main panel in PVC conduit (the grey sched 40 stuff the big box stores sell) to make a neater installation, rather than attempting to run three 6/2 cables (not to mention there is only 1 connection point inside the water heater for an earth ground, so running three 6/2 cables, each with its own ground wire, would be problematic as to what to do w/ the other two ground wires in the cables.) ![]() The water heater is roughly 50' from my panel. I am installing a new electric point-of-presence hot water heater which requires 3 240v 50 amp circuits (6 hot wires, 1 earth ground).
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