Search results for query: *

It may be a bit embarrassed asking this question, but this is where engineering meets real life questions IMO. Is this 200A fuse allowed to be installed in the shown 400A FDS or are fuse reducers required (Eaton Part # J-42)?

We have a vendor who is supplying an integrated motor control cabinet on a piece of equipment. The motor is a 480V, 250HP motor. Down stream of the main CB, the vendor is tapping the power cables between the CB and the 250HP motor contactors to supply 2 small fan motors, a 3HP and a 7.5HP...

Can anyone offer a website or point me in the direction on some estimated costs for 15KV Switchgear costs? We're likely spec 15KV metal-clad outdoor with common BIL and KAIC ratings. Just need to put together a quick high level estimate and don't need to bother vendors at this point. I was...

We have a customer in Philly who currently has an old 2 Phase system (which history tells me has a phase shift of 90 Deg). These systems used to be popular in Philly and still existing in some areas. For years, the customer had what appears to be a single phase buck-boost transformer to turn...

Hope everyone is staying well. Looking for software to assist in guy wire calculations for power poles with OH lines? Any suggestions?

Per the sketch below, can someone confirm these cables only need a 0.80 de-rating factor (Table 310.15(B)(3)(a) since there are 4 carrying conductors per cable (DC application, 2-1500V+ and 2-1500V -) as long as 1" cable diameters are spaced at 1" intervals via intermittent plastic cable...

Does anyone know of a spreadsheet or website to compare the difference in price for different installation practices for MV power cable? Looking to compare ACSR, Direct Bury and underground ductbank.

We have an application where we need to replace an older synchronous motor with a 4KV, 1250HP, 8P replacement synchronous motor. I would prefer to replace it with a VFD and SC motor, but unfortunately, this is not an option. Who, besides TECO Westinghouse, still manufacturers these relatively...

Does anyone have a recommended website, rule of thumb when pricing namebrand MV Switchgear (CBs and E-2) and/or LV Switchgear? Trying to put together some pricing estimates from local suppliers and prices appear to vary significantly until the final contact will be negotiated. Anyone know of a...

Can anyone recommend either a publication or website that gives broad overall information on power equipment such as switchgear, power transformer, etc. I routinely need weights, or dimensions. I used to have a Siemens Power Engineering Guide (4th edition?) but have recently misplaced it. It...

Does anyone know of any website which lists the benefits/requirements of getting electrical drawings stamped by an Electrical PE per state? My immediate state in question is PA. What type of drawings are typically required to be stamped and in what industry? I would imagine power one lines...

Do any of you know the common way of how turn signals (pulsed signal) cancel the brake lights (steady when brake is depressed) in automobile applications?

Anyone have any experience with Magnadrives on motors >500HP? Their website is very convincing, but I don't see this technology taking off like I thought it would. Just wondering why. www.magnadrives.com .

Can anyone suggest a decent 3-4 day refresher course on topics such as MV Motor, MV starters, relay protection?

Ok guys, I really need your help on this one. NEMA Size 7 500HP DOL Starter Parallel 500MCM Cu Cables per Phase into contactor Parallel 500MCM Cu Cables per Phase out of contactor Length 75 Feet Cable Tray Installation Load Cables Measure 554 556 552 Here's where it gets wierd: Independent...

We are looking at keeping a VFD turned on but have it output 0 Hz in order to keep the motor warm without the use of space heaters. No external process conditions will turn the motor. My assumptions are when we magnetize the motor at zero speed, we don't get the "conventional" iron losses...

Why is it when we, as an engineering firm, follow the NEC for industrial motor applications, Electrical contractors always fight conductor sizing. For example, when sizing a motor, and taking into account temperature deratings and cable fill deratings, a 100A conductor is sometimes only rated...

I was always under the impression that agitators were to be categorized as constant torque applications. However, per this website, agitators tend to have this speed-torque curve which indicates that they are variable torque. Can anyone elaborate on this? http://cipco.apogee.net/mnd/meavovr.asp

We commonly use Ohio Semitronics PC2 KWTs for KW feedback from our motors. What's the easiest way to verify the KWT is accurately working?

Just need to ask if I'm missing anything here in this analysis: Motor Async Sync Load 1169 1169 KW Motor Eff 0.96 0.96 % Gear Box Eff 0.985 0.985 % Power Factor 0.88 1 hours/day 24 24 Hours days/year 350 350 Day $/KWH $0.09 $0.09...