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I'm working on the design of a service for lights at a ball field. The poles are concrete and will be 70ft above ground level. The pole has a bare Cu. wire encased in the concrete and bonded to the lights supports. My questions are: 1. Should I terminate the bare Cu. wire at the bottom of the...

Hello there, our company has to provide test results on the Thermal Resistivity of a concrete mix design for a duct bank. Does any one know of a testing company that can do this type of testing and is located in the state of Florida? Thank you.

Chapter 430, Part X of NEC requires that feeders for VFD be rated at 125% of their rated input. I would like to know if I'm interpreting this correctly. If I have a VFD rated at 400A, the feeder for this VFD will have to be sized for 500A (400*1.25)? Ahead of the VFD, the feeder for the motor...

Hello, I have a question on using the foundation rebar as one of the grounding electrodes. The code specify the use of a concrete-encased electrode when the concrete foundation is in direct contact with earth and other restrictions which are not in question. Should this method be suitable when...

Thank you everybody, That's kind of what I had in mind. Engineering/Consulting fees at one rate and drafting at a lower rate. I think is fair enough. Regards

Hy everybody, I'm thinking on open a consulting firm and hopufully somebody can answer some questions. Are the engineering fees different from the drafting fees?, when the company offer both services., or are the drafting fees included on the engineering fees? Regards

well earned imok2, but the pay check did not have the same luck... quark is from the mechanical engineers. Like I said before I just want to be sure that I'm not missing a detail on the HVAC system. Thank you all for your help.

Thank you all. That is my understanding too, but I just want to double check with the experts.

Hi, may be I'm missing something. Sometimes when I asked for the electrical specifications/requirements on an HVAC unit condensing/AHU, the people give me the tons. Like 4 tons 15 tons. Is there any way that you can size the min/max protection on these units just having the capacity in tons...

Thank's everybody for the information. jghrist, at this time will be commercial/industrial and in the future will try to get some work from utilities.

Hello, I'm planning on buy a software to perform Coordination Studies, Short Circuit, Power Flow, Arc Flash and possible Harmonics. Could you people give me some advice between ETAP and ESA, pros versus cons. Which may be the best way to go getting the more practical uses of the software...

Thank you mpparent and rbulsara for the information. That's the way I see it. You guys have a great weekend.

Hello there, we are discussing the use of GFI receptacles in commercial bathrooms and there are different arguments, I hope you people share your knowledge. Here are the issues, It is required in a commercial bathroom (one toilet one basin) to install a power receptacle? and if is required it...

Thank you for your responses davidbench and stevenal, that makes sense.

Thanks davidbeach, it seems that the clearance should be ok. I did not enter to the room because there are too many things around, once I get the drawings and they remove all the junk from the room I'm planning on take some measurements. But don't you think that this location should be...

Hi there, I was asked to check an existing building. The building has a restaurant and a retail area and the intention is to renovate the retail area. I don't have any drawings yet on the existing conditions, the owner is working on that. There are two gas operated water heaters inside the...

Hy, we are installing a transformer 69/12.47 kV , 30/56 MVA. The actual design for the secondary conductors is 2- 1750 bare Cu./phase. 1.Has any body knows the availability of this type of conductor? 2. There are some concerns with the weight that will be imposed to the bushings. Any...

Alehman, my application will be a panelboard on the same wall as the drinking fountain and will be facing an open area, it won't be enclosed in a room. This wall is only about 7ft wide. What is your opinion on installing this Panelboard about 2ft horizontally apart from the drinking fountain...

Hello, can a panelboard be installed 20" from a drinking fountain, as long as you have the 30" working space in front of the panel? or do I need to treat it as a receptacle next to water, so that the working space be at least 6' from the drinking fountain? (I probably don't want a GFI panelboard...)

Sorry but I forgot to ask, Can I make toolbars? and are we talking on the VB that cost about $100.00 if not which one I should be looking for? I'm not too familiar and when searching there are too many different packages. Thanks.