If a MCC has a surge protection device in it and if it feeds a panel board and is on a emergency system (generator) does the panel board still a surge protection device to meet the requirements of NEC 700.8.
It couldn't hurt. I think it's a design question that is best answered by Earl, the engineer. It's possible, but also possibly not necessary. He may require it in more than one location. Some of the plan is too light to read (at the generator) but thanks for providing the plan.
PS - That design goes back to 2016, so a call to the engineer may be in order.
would the generator even be considered a emergency system. It does not proved power to any emergency systems per the NEC definition.
I disagree. It may not be Article 700, but it could be Article 701 or even Article 708 (COPS). Critical Ops by definition if disrupted, could affect the public health. That plan you have there is for Department of Public Works. Are you looking for reasons why not to install the surge protection? Why don't you just call the engineer?
Just getting push back from the contractor. I put a RFI to the engineer today.
Good. I'm also an EC in MD, and I would never take it upon myself to make a decision like that, especially a job of that high importance.
RFI came back saying SPD are not required because there are no emergency systems connected to the generator.
The code language answers your question.
700.8 Surge Protection. A listed SPD shall be installed on all emergency systems switchboards and panelboards.
Last time I checked, "all" means "ALL"!
Yeah.....but I was thinking it might be kind of the same case as GFP, like in 215.10. GFP wouldn't be required on the feeder if GFP protection is provided at the service. I'm overthinking.
But in this case, I don't see any exception...like in 215.10. So I'm going to agree that "all" means "ALL !"
Ummm, are you calling a Circuit Breaker a Surge Protection Device?
A "listed SPD" as referred to in 700.8 does indeed refer to a device listed per UL 1449.
The device can be a piece of dung and would still be compliant as long as it is a SPD listed to UL 1449.
And all does in fact mean all.
The installation of multiple SPD's on multiple panelboards creates a cascading of protection where the next SPD "sees" less of an event than the prior SPD. Thus you improve power quality by designing electrical systems that utilize multiple SPD's in all power paths.
UL 1449 is one of the very few UL standards that measures performance.
I'm learning new stuff. I've always looked at Surge Protection as Components in parallel. In this case, what I see is a CB with the added ancillary feature of having Surge Protection. It is very difficult to measure the performance of a Varistor - and it would be destructive - rarely done that I know of. I believe most in this category suggest replacing the Component of which the Surge Protection resides - after a particular amount of Time.
I think the gist of your comment is that UL 1449 is one of the few Standards that hold a higher level of performance.
Well, someone must of thought it was an emergency system, since we were asked a question and given a drawing with "700.8" written on it.
I have my doubts as to the validity of the answer you got. That is a municipal water system and could very well establish pressure for a fire pump....somewhere.
I wonder if any hospitals are supplied with water?
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