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    Simplified

    That was awfully lengthy, going into all the Code rationale.
    Here's the result; wondering if experts agree with me.

    A bundle has several hot wires per breaker; we wish to modify the derating...
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    Echoing JIm on the old back-stabbed receptacles;...

    Echoing JIm on the old back-stabbed receptacles; if you're having circuit problems, just go ahead and remove all of these. In my limited amateur wanderings, I've seen at least half a dozen of them...
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    I'm guessing you saw the first posting in this...

    I'm guessing you saw the first posting in this thread but not the follow-up? The first discusses the trivial case of one wire; the second goes into neutrals (which are counted unless part of a...
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    online NEC 2008: a printing tip

    If you're on a budget like me, and haven't yet bought a printed copy of NEC 2008, hopefully you know about the free online edition:...
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    Think I've got it, based on FPN 1 and Annex B

    I think I finally tumbled to what Annex B is saying about how load diversity (the percentage of active conductors) applies to the derating of multi-conductor bundles, and this explains how to handle...
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    Derating bundled wires on same circuit

    When over three wires from the same branch circuit are run in a conduit, NEC appears to require them to be derated just as if they were on separate circuits, all capable of carrying full current at...
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    Edit - Yes, it turns out the existing square-D...

    Edit - Yes, it turns out the existing square-D bkr lists a torque for #2 Al, and I was able to get the conductors to fit comfortably.
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    Thought I'd give you an update: we're replacing...

    Thought I'd give you an update: we're replacing the entire feed with four-wire SE-R (Al #2 with #4 ground). Wasn't as expensive as I'd feared, tho it's work to get it into place.

    I didn't trust...
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    Torque (getting it right)

    How do you estimate (or measure) torque on connector screws?
    Put another way: how do you teach an apprentice what the correct torque feels like?

    I discover I over-tightened some screws on the...
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    Checking, I discover the old 50A feed starts out...

    Checking, I discover the old 50A feed starts out as SE (red, black, wire braid) and then splices (probably in the crawl space) to the cable with R/Bk/Wh type TW that's found at the subpanel.
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    not SE

    Fortunately the subpanel's feeder is not SE; neutral is white, and similar to the other two: individually marked as TW, though in a cable. (Probably it's whatever they used in 1955.)
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    Supplying ground to old subpanel

    I discovered our old garage/rec-room subpanel is fed with 3-wire 220V (no ground), with N-G bonded locally. :eek: (This is an attached garage, soon to have a laundry.) If I'm reading the tables...
  13. Reading elsewhere, I notice there isn't even...

    Reading elsewhere, I notice there isn't even consensus to use GFCI outlets for a laundry if there's no sink -- which suggests that I may be overly-cautious here about controls near the washing...
  14. laundry: washing-machine clearance from switches

    I need to place some controls in the vicinity of our washing machine: switches, fan speed, and a 120V thermostat.
    Above the washer, heat from the appliances will affect the thermostat; below the...
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