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Thank you, resqcapt119 and waross. I think we will settle on making the ground-check conductor green with a yellow stripe to differentiate it from the actual grounding conductor. We will connect the ground-check conductor to a ground lug inside the motor terminal box and land the mcc end of that...

Hi All, We are starting to design a system where the motor control center is feeding power to various motor and other loads at 480Vac. The difference is, we want to include an insulated non-current carrying conductor that will serve as a 'ground-check' conductor. The idea is to land one end of...

Well, crap. I didn't realize the CPT got moved under the contactor. It didn't used to be there, but the last time I worked in an MCC bucket was ages ago and it was probably pre-Intellicenter. Thanks. J.R. Galatians 2:20

Hi jraef, Thank you so much for your reply and your offer to photograph a 1SF bucket on Monday. I would greatly appreciate that. Since we intend to order the MCC with separate control power, which eliminates the control power transformer and fuse block inside the bucket, I'm thinking that might...

Hello fellow sparkies, I did a search on this site for a similar question and, finding none, thought I'd post it here. Is it possible to 'shoehorn' a single E300 digital expansion module into a 1-space factor Allen Bradley IntelliCenter bucket that gets its 120 Vac control power from a...

Good day, all.... Looking for some practical advice on whether to integrate a 200 HP PowerFlex 755 VFD as part of a new Allen Bradley Intellicenter, or keep the VFD in it's own cabinet separate from the MCC. I know both can be done, but I'm looking for practical advice either way. Thanks...

RRaghunath... Adding a fused disconnect at the zigzag is precisely what I was NOT wanting to do, nor do I think it's advisable. If that switch is turned OFF or if one or more fuses blow the derived neutral ground is no longer present. One alternative, I suppose, would be to feed the zigzag...

Hello Everyone, I am in the process of designing a 480V three-phase, 3-Wire + Ground industrial distribution system that will be fed from a 2500 KVA pad mount transformer with a 480V Delta secondary (The delta secondary is being used to create a 30 degree phase shift from a different pad mount...

Do any of you know of an insulation resistance tester (0 - 2500 V) that incorporates a remote dead man switch feature? We are getting ready to do a lot of insulation resistance testing on new construction in an industrial plant. I've been doing megger testing the old school way for years, but...

Hi All... Not sure this is the right forum for this question but thought I'd take a shot anyway. I'm looking for a graphical software package similar to FlashTrack (facilityresults.com) but which operates on either the iPad or an Android tablet. FlashTrack only operates on Windows. Any...

Hello cuky2000, Thanks for your advice. I haven't gotten into this far enough to make a beer napkin or whiteboard engineering drawing yet. I was thinking that since the total suspended length of the cable will be around 85 ft, I could use a single 4 ft long chinese finger cable grip to support...

Hi All, I have been given the task of installing 15kV power via a 50 ft long borehole, six inches in diameter, from the surface down into an underground limestone mine. The power cable down the borehole is estimated to be a 500 MCM three-conductor cable plus ground. I have never installed a...

Thank you, DTR2011. That instrument looks pretty nifty, especially since it can do tan delta testing of cables. Thanks! Galatians 2:20

Excellent paper, dpc. Thank you for the link. I believe that if we end up installing a neutral grounding resistor to limit the ground fault current to 50 amps or less, I would feel a lot more confident that we can continue to use the existing conduits if we supplement them with added parallel...

Thanks dpc. I have the same lack of confidence in continuing use of conduit as the equipment grounding conductor. All systems that we have installed over the last 15 years or so have ground wires pulled with the phase conductors in each and every conduit, regardless of the conduit material. I'm...

Thank you for your reply, Skogsgurra. I'd be very interested in learning the results of your testing. Stevenal... the problem is a little more complicated than this, I'm afraid. We already do employ ground detectors and you're right about their use reducing the chances of a double phase to...

I have an existing facility that was built 30+ years ago where the 480V power is supplied by transformers with ungrounded delta secondaries. As such, no equipment grounding conductors were pulled through the conduits between the ungrounded delta transformer secondaries and the motor control...

Hi All, Do any of you know of a manufacturer of 600V, 3-conductor power cable, Type G-GC (ground plus ground-check) with a galvanized steel or aluminum armor and overall PVC jacket? Needing sizes #10 AWG thru #4/0 AWG. If so, please point me to the manufacturer(s) where I can order. Thanks in...

Perfect. Thanks DRWeig! Ohio Aviator Galatians 2:20

Hello All, I'm looking for some free or nearly free Cad drawings (dwg, dxf, etc.) for various styles of overhead power line pole framing- mostly simple R.E.A. type framing. Any ideas where I can go download? Thanks! Ohio Aviator Galatians 2:20