Search results for query: *

No worries; I thought maybe I was just looking at an older/newer version of the Code. I definitely appreciate the reference!!

Section 127 of my 2007 NESC states the following:

rbalex- I think it would be best to split 502.10(A)(4) into two sections: (4) Fittings and boxes: (a) Fittings and boxes in which taps, joints, or terminal connections are made, or that are used in Group E locations, shall be identified for Class II locations. They shall be dusttight and...

I agree with the Code language change. It's an issue of Code language versus reality. They try to give you some leeway if there's no splice in the box by saying that it only has to be dust tight, but then they say it still has to have threaded bosses. No such enclosure exists in the real...

respcapt19- The reference to "threaded bosses" makes sense in the case of conduit fittings; I think all conduit fittings (e.g. outlet bodies, etc.) rated for hazardous locations have threaded entrances cast right in. However, in the case of enclosures, they typically don't have the same...

Thanks, rbalex. I tend to agree with your approach. I am generally very conservative by nature on these types of issues. Just trying to play "devil's advocate" and explore all options. Any other guidance is fully appreciated! Thanks!

Veeeerrryyy interesting. That can be a pretty big judgment call for the Authority Having Jurisdiction, especially if the AHJ isn't exactly a Code expert. That leads to an interesting question, if a threaded Myers hub doesn't meet the "threaded" requirement, what does?? Again, I'm talking...

Thanks, resqcapt19. Does anybody else have an opinion on Myers hubs? I looked up Myers hubs on Cooper Crouse-Hinds' website and the data sheet lists "Class II, Divison 1 & 2" under the 'Certifications' section.

We recently performed a full evaluation of our Class II, Division 1 classified locations (coal handling). There were several instances in one building where single locknuts were used for conduit penetrations in enclosures. What can we do to meet the Code requirements for these...

Thanks, guys! oldfieldguy- That's what the isophase OEM stated. It just feels weird to me to use a "mechanical" grease on an electrical connection. I don't think we've ever done that before at the plant, so it's just making me nervous.

My plant electricians are getting ready to replace the braided connection from our utility generator to our isolated phase bus conductor system (I.e. isophase). The voltage is 20kV. In the past, we have used No. 2 EJC electrical joint compound at this connection. The isophase OEM rep just told...

Thanks for the help! I have notified the manufacturer that we will be supplying 480V, 3-phase power and they are choosing the ballasts accordingly. It sounds like a very good suggestion to make sure the fixture housings are grounded. I took a look at some of the manufacturer's other setups...

I am looking to install several 1000W exterior lights at our facility. I have been told by the vendor that I can supply any voltage that I want and he will select the ballast accordingly. All of the 277/480 lighting panels that are nearby are fully loaded, so I am looking at feeding the lights...

ScottyUK, Since the original posting, I have since found that the motors are started with resistor time-starter controllers, exactly as you guessed. The 140 HP was a type-o. The nameplate FLA is 140, and the rated HP is 20. We measured the inrush at about 510A, about 360% of FLA. Sounds...

Driving. It was...I want to say three days before the mix up was discovered, so the truck had been run for probably 120 miles or so before that. I just filled the tank up right away to try to dilute the mixture (probably not a the best idea). But, like I said, the truck has been running fine...

Hey, I've got a 2002 Chevy Avalanche and I let my buddy borrow it to move some stuff. Well, being the nice guy that he is, he decided to fill the fuel tank up before he gave it back to me. The problem is, for some reason he thought the truck was a diesel and put about 12 gallons of diesel fuel...

I'm not really sure how a SWGR manufacturer would have information about DC motor inrush. More than likely, I will just have an electrician clamp the input to the motor during the next outage when we can start up these Emergency DC motors and get accurate measurements, but until then, I would...

I need to establish a load profile for our DC battery system at a U.S. power plant. The profile is being used to evaluate the adequacy of size of our battery system. I have two questions: 1) What is a typical estimate for DC current needed for 2400V switchgear to trip? I know that the...

radomir- Thanks for the reminder :-) RAM- Thanks for the advice. I have read further on similar postings in the Electric Power Forum and am looking into some possible causes.

Thanks, ERaySir. We feel confident that our rotor alignment is good. However, we do have a voltage unbalance which is likely causing the problem.