Best Rated threads in ⏚ Electrical Engineeringshow all threads
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277-480 3 Phase Generator to single phase
Help please we are being given a a 50kW generator that puts out 3 phase 277-480 volt 3 phase, just have to pick it up. How do we use this with our sinle phase building? This is a serious question, if...
8
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17 years ago
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8 | |
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Wiring a contactor for Push Buttons.
I have a GE Contactor CR306Y1 with heaters that I am trying to wire for my motor starter. I understand how to energize the coil but can not find the other tap so I can integrate a start AND stop push...
1
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17 years ago
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Dumping 1.5 Amps to ground
I put a clamp on meter on the main cable from the meter into the panel and noticed an imbalance (should read 0). Next, I checked the ground cable going to a water pipe and found the same current...
11
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17 years ago
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11 | |
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Window AC unit questions Fridgidaire FAA087P7A
We just got a Fridgidaire FAA087P7A3 8000 BTU window unit to cool a garage area. It is equipped with a "dongle" type power cord which includes some sort of arc fault detector in the event the power...
5
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17 years ago
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Voltage Between White Neutral And Gnd Wire Question In House Wiring ?
Hello: Have been trying to get some smoke detectors interconnected, and during the trouble shooting of the problem, I measured (with an analog voltmeter) the voltage between the white neutral, and the...
4
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18 years ago
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Need Information for a Science Experiment
I want to build an electro-magnet for a HS physics class. I'm using a 6v dry cell battery for the power. I want to include a pot in my circuit to control the amount of power going to my magnet which...
19
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18 years ago
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19 | |
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Linear current booster
Wondering where I might find a schematic for a home brew linear current booster to control PV module power to a very small 12V 2.5A bilge pump? My googling didn't turn up anything. Chuck
7
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18 years ago
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7 | |
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Spectrum Controls SOI 200 User Manual
Hi All! Have a spectrum control SOI 200 here in a water treatment facility. They've lost the user manual for it, it's hooked up to a SLC 5/02. Anyone in the group know where I could obtain a user...
2
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18 years ago
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2 | |
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12470 to 208 transformer
I can't seem to find a transformer for 12470 pri to 208 sec. Any suggestions? Vendors? I've heard people talk about parallel transformers. If the turn ratios are the same and impedances are the same...
9
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18 years ago
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9 | |
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hole fill - romex runs
I'm pulling 14-2, 14-3, and 12-2 perpendicular to I-joists. Cannot see any guidelines or NEC rules governing the number of cables that can be run through a typical 1" or 1.5" hole through the web. How...
9
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18 years ago
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9 | |
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three phase panel - 240Y/139 instead of 240 delta
Given a circuit breaker panel rated for 240 volt delta, center tapped (which means 120 volts to ground for A and C phases, and 208 volts to ground for B phase), what is the chance this panel could...
30
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19 years ago
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30 | |
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Centre tapped transformer
Could someone point me in the direction of information regarding centre tapped transformers. I need more details to try and understand why they are used in the uk on mains voltage for controlling...
17
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19 years ago
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17 | |
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Century Plasma cutter.. what size fuse?
Hey guys, I just picked up a used Century 20/40A plasma cutter. it's 208/230V. I can't find any specs on this thing anywhere.. I hvae the wiring diagrams. but it doesn't say what size fuse/breaker to...
2
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19 years ago
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2 | |
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Electrical Panel Schedule software
I have recently revised and updated my panel schedule software and website. Thanks to those here who helped me test and refine the program. AutoPanelboard is software that works in AutoCAD to automate...
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19 years ago
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Another hot tub wiring question (long) - best 3-phase service?
This rather long question is directed to electricians and engineers who are familiar with wiring and service installation requirements for a commercial hot tub business. The question is what is the...
34
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19 years ago
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How do I connect PTs and CTs for 400A 3ph service
Usually the utility does this but this time it is for information metering an we will do it. It will be a type A 2 1/2 element meter with CTs and PTs. Seems to me I remember that the "dot" on the CT...
65
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19 years ago
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65 | |
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center load voltage drop calculation
Hello everybody, I recently took a mater electrician test prep. class where the instructor introduced imtroduced us to center load voltage drop calculatins. Upon reviewing my (sketchy) notes, I can't...
2
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19 years ago
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Why is EE education mainly glorified math?
Of course EE is not about solving glorified math problems. But the EE educational system is set up in such a manner. Most of an EE student's GPA consists of the ability to solve problems on paper for...
50
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19 years ago
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50 | |
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Question: Should a light bulb ever flash when the switch is turned off?
Hi, just a quickie until I can contact my local electrician in the morning. Apologies in advance for my limited understanding of things electrical! A little earlier on I fitted a Philips energy saving...
13
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19 years ago
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supply for old audio transistors (driver transistors: 2SD381 / 2SB536)
Hi, I find it pretty hard to find a shop that actually understands what one is asking for... I my case most of the shops I called up they did not even know the amplification class of their transistors...
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19 years ago
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