I mostly agree. But I find it hard to believe that anyone would seek the AHJ's opinion regarding the particular construction details of LISTED luminaires.
It's likely that the only time the Article 410 sections I referenced will come into play, will be AFTER there has been an injury or fire...
Thanks to all those that replied.
I've asked a number of folks about this, and posted it on Holt's forum as well. To summarize all of it:
(1) Section 90.7 of the 2005 & 2008 NEC roughly states that one need NOT inspect Listed equipment prior to installing it (except to look for defects, or...
I used Part VII as an example. What interests me the most are actually: 410.18(A), 410.20, 410.28. These requirements seem to apply to the manufacturing stage of the fixture. Please see the 2nd & 3rd paragraphs of my initial post (above), regarding this.
True, but Part VII of Article 410, includes detailed requirements regarding the CONSTRUCTION of Listed luminaires, and they are stricter than those of UL 1598.
Sometimes there are inconsistent requirements for manufacturers, between the NEC and UL standards. Presently, I'm looking at requirements for manufacturing luminaires, and see some grounding requirements in the NEC, are stricter than those of the UL.
For example Article 410.18 states that...
I did find it - but only through some persistence. I've used the NEC for nearly 30 years, and have been an IEEE member for nearly 20, but I don't typically associate one with the other. For the places I've worked (e.g., A&E design firms & petro-chem), the term "IEEE" is rarely used, except...
resqcapt19: Thanks - I agree that 300.3(B) would be a great reference for this.
BtW - I've visited several forum sites lately. For most of them it's readily apparent where to find the best forum for NEC topics/questions; but not for this one. It seems that there should be a separate forum...
Here's an oddity I came across. An electrician was called to a house, because of lights flickering. He came to believe there was an open in the neutral of a 2-wire branch circuit. But he was unable to locate and correct the open. So, he jumpered the neutral to the neutral of another 2-wire...
The bridge crane (including its 1600 kVA transformer and VFD's) will be a very small part of this yet-to-be-built plant (which will use 100's of MVA overall), and I doubt it would have a significant contribution on the overall power system distortion.
So, I must somehow simplify this issue with...
Thanks for the replies; they were very useful.
FYI - the two largest VFD's (for 450 HP motors) will be part of a 44-ton capacity bridge crane. I'm simply providing a 5 kV feeder to the 1600 kVA transformer that rides with the bridge (this transformer supplies all power to the bridge crane). The...
I'm involved in the selection of VFD's for some large AC motors (up to 450HP). The spec that was given to the supplier imposes the requirement that these VFD's "shall meet all requirements of IEEE Std 519".
I have IEEE Std 519 ("Recommended Practices and Requirements for Harmonic Control in...
Section 409.60 of the 2005 NEC refers to "Multisection industrial control panels", but there is no definition. What would be an example of a Multisection industrial control panel? Would it be multiple sub-panels in a common enclosure?
Also, the second sentence of 409.60 seems ambiguous. Is a...
Section 440.4(B) of the 2005 NEC requires that the Short Circuit Current Rating (SCCR) be included on a visible nameplate for "Hermetic Refrigerant Equipment" having multiple motors or combination loads, when supplied by an OCPD of more than 60A .
A major industrial HVAC equipment manufacturer...
A large 1 MVA, Delta-Wye transformer supplies a 480V, 3-Wire MCC via a bus-duct. The 20-foot length of bus-duct contains NO ground-bus, and no neutral, and the enclosure is NOT Listed for grounding.
The transformer secondary, and the Ground-Bar inside the MCC, are both connected to the...
What I want to focus in on is the point you made regarding the "single Main" inside the Control Panel. Let's assume that 240.21(C)(3) is satisfied, including the requirement that the OCPD's are "grouped" (i.e., there is no single MCB; but two branch CB's that the supply conductors terminate onto...
A particular 480V Industrial Control Panel in a "Supervised Industrial Installation" is fed from a large (say 2000 kVA) transformer, without any type of OCPD on the transformer's secondary side, and without a Main CB inside the panel. Instead, the 15-foot long tapped supply conductors terminate...
Thanks for the replies. For dpc's reply, note that the section referred to is for 600V, and above (the transformer in question is 480V-208Y/120V).
For wareagle's reply, I DO want to "install the full load capacity"; which is what prompted the thread. But I have been unable to find a code basis...
Assume a balanced connected load of 25 kVA on the secondary of a 45 kVA, 3-phase, 480-208/120V transformer. Does the NEC prohibit less than that of the transformer's primary rating for sizing wiring and CB? For example, can a 45A CB, and 50A ampacity wiring be used to supply the transformer's...
For a large existing hotel two new circuits will be added to each guest room to eliminate nuisance CB trips caused by too many coffee pots and hairdryers. These new circuits will feed only one receptacle each per room (one for a hairdryer & one for a coffee pot). New panels & transformers will...
