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Type: Posts; User: jaggedben

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  1. From a firefighter's point of view, the one that...

    From a firefighter's point of view, the one that is more accessible from the service probably takes precedence. I don't think you're required to label more than one but if your just using stickers...
  2. In my opinion it's unnecessary. A cheaper...

    In my opinion it's unnecessary. A cheaper solution, probably, would be simply making that combiner panel a main-breaker panel. But I don't see why this is different from the many, many...
  3. Do you really want to run that much PV wire in...

    Do you really want to run that much PV wire in conduit instead of transitioning to THWN-2 at a j-box on the roof?
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    14$$
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    Look up those threads I talked about. The code...

    Look up those threads I talked about. The code actually has a lot of vagueness on this point.
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    14$$
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    The AC hot conductors are isolated from the GEC...

    The AC hot conductors are isolated from the GEC but of course the AC neutral is not. However since the inverter output does not utilize the neutral and is not supposed to put any current on it (it...
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    I did an install on exactly this type of...

    I did an install on exactly this type of construction a few years ago. We used Pro-Solar Fast jacks because they only required one bolt. We used double-sided Eternabond sealing tape in between the...
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    14$$
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    We had an 87 post thread about whether or not a...

    We had an 87 post thread about whether or not a supply side tap is a service disconnect a few threads back, which I'm not going to link to. :roll: You can find it, and a few others on the subject,...
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    24$$
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    I understand the concept of the 120% rule for...

    I understand the concept of the 120% rule for panelboards, which have distribution spread along the busbar, and which are not necessarily tested during the listing process to examine how thermal...
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    24$$
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    Good points, although if the AHJ decides to...

    Good points, although if the AHJ decides to enforce the 120% rule on this conductor then it's mostly moot. Not much support in the 2008 code for considering an inverter output circuit to also be a...
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    24$$
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    Hopefully your AHJ doesn't want to get you into a...

    Hopefully your AHJ doesn't want to get you into a sticky situation regarding that either.

    I feel that we can assure you that a feeder that is only rated for the load is safe. We just can't assure...
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    24$$
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    In this case that's not any help. But the 2014...

    In this case that's not any help. But the 2014 wording on feeders might be.
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    24$$
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    612

    There's no need to downsize the breaker with...

    There's no need to downsize the breaker with respect to the busbar. 125A*1.2= 150A, which is greater than 100A+40A. You are required, however, to put the solar breaker at the opposite end of the...
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    Sure. But the inverter is not three phase, and...

    Sure. But the inverter is not three phase, and that is the 'source', which is the way the code is written. (If there were multiple single phase inverters spread around three phases I would...
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    4$$
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    In my opinion the letter of 705.42 does not apply...

    In my opinion the letter of 705.42 does not apply to your system because you do not have a 3-phase source. Not being an engineer, I can't assure you that weird things couldn't happen that might make...
  15. Thread: battery

    by jaggedben
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    2$$
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    It depends on the voltage of the batteries and...

    It depends on the voltage of the batteries and the ratings of the equipment they are connected to.
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    NEC ampacities are calculated using safety...

    NEC ampacities are calculated using safety factors. A safety factor is a very broad engineering concept. In this case it's a factor that divides the amperage at which the conductor insulation...
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    5$$
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    You're right, misworded answer. It's a violation...

    You're right, misworded answer. It's a violation if you don't have the partition.
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    Not unless you have a partition separating them. ...

    Not unless you have a partition separating them. See 690.31(B). (This only applies to PV circuits. Other DC would be okay.)

    Also, depending on what you mean by 'trough', that may not be an...
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    13$$
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    Thanks for the resource. I wonder what some AHJs...

    Thanks for the resource. I wonder what some AHJs will think of a self-certified non-UL listed application.
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    13$$
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    That's an interesting idea that the two poles of...

    That's an interesting idea that the two poles of an ungrounded system are connected in series and thus meeting such a requirement. Never really thought about it that way before. I was about to say...
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    I would bet it's this, for meeting UL 1741. ...

    I would bet it's this, for meeting UL 1741.

    I'm assuming he's already looked into the possibility that the inverter can be configured to not require the neutral.
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    13$$
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    what ggunn said. Rooftop disconnects are a...

    what ggunn said.
    Rooftop disconnects are a PITA, but...

    Try out one (or two) of these multi pole disconnects on your AHJ....
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    13$$
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    (Why combine on the roof?) (If residential,...

    (Why combine on the roof?)
    (If residential, generally speaking, why combine at all?)
  24. Google found me a couple relevant results for...

    Google found me a couple relevant results for "200A sub feed lug kit..."
    ...
  25. Agreed.

    Agreed.
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