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The most recent discussions

MV Distribution w/Floating Neutral?


March 20, 2019, 2:36 pm

Hello, all. I was in Cedar Rapids, IA recently (I don't reside there) traveling along Rt. 100 (Collins Rd) in northeast of downtown. I noticed utility poles with a single cross arm accommodatin... Read more »

Touch potential


February 16, 2019, 1:30 pm

I'm learning at least a little bit about touch potential. Most of what I've found is related to the guys who work on power lines. I did find this sketch of a guy touching a lamp post wi... Read more »

Equipment grounding


January 24, 2019, 1:17 am

I work for a company that sells center pivot irrigation systems. A common situation is the pivot and electric well motor are powered from a commercial utility. The electrical service is th... Read more »

Function of Portable Generator Outlet Ground


January 3, 2019, 3:10 pm

Hello, all. As most portable consumer-grade AC generators don't have their grounds (frame and ground prongs on their mounted AC outlets) bonded to their neutrals, I was wondering what useful fun... Read more »

Mil spec pots


December 11, 2018, 5:38 am

I am looking for a couple off wet location/mil spec pots (25 and 500 ohm) Any ideas Read more »

DROP . . .BOX [an inexact cross-post from sci.math]


October 7, 2018, 1:57 pm

https://www.dropbox.com/sh/gabop77dlx550wg/AADerU5lqy9yiFKkO0JOExzRa?dl=0 is my Dropbox link. Full although not a complete list of items [thoughts]. -Simon Roberts tinkerers Read more »

Wrong signs in three formulas of electrotechnics


September 21, 2018, 9:37 pm

Lorentz force formula F=qvB has been obtained by experiment. It can be derived from third Hertz's equation: rot E = -d/dt B - rot(v x B) if derived in such way it changes sign, F=-qvB. Another two... Read more »

Is Class 1 laser safe enough for baby eyes?


July 31, 2018, 10:21 am

I meant, what if someone accidentally shine Class 1 laser into a baby's eyes? Would it hurt retina and leave a permanent damage? I know ... I know... it should NOT happen. Adults are supposed to b... Read more »

Dimmer for 4V LED


June 29, 2018, 4:13 am

I have a 4V, 0.75A, 3W power adapter (120V input) that powers a single LED that is too bright. Is there a way to make or purchase a dimmer that could work on the low power side? Thanks -- m-m ... Read more »

MV-to-LV Connection


June 27, 2018, 10:38 am

Hello, all, and a question especially for those who work in AC power distribution: One is provided with two line-line MV (assume 34/19.9 kV or less) distribution lines (L1, L2) and a neutral (N)... Read more »

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The best rated discussions

12470 to 208 transformer

rating: 5

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 ... Read more »

replacing a varistor

rating: 5

I need to replace a varistor on a circuit board and I cant find any markings on a good varistor still on the board. The board consists of several triac circuits which all operate the same type of sol... Read more »

Hard wired home watt meter

rating: 5

Hi I see some products like Kill A Watt that plug into the outlet to monitor device energy usage. I would like to be sure that the person does not take the device out when I am not around and plug ... Read more »

Another hot tub wiring question (long) - best 3-phase service?

rating: 5
  [ 2 ]

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 ... Read more »

Electrical Panel Schedule software

rating: 5

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 automat... Read more »

Re: PIONEER PD-T505 schematic

rating: 5

Contact Pioneer Spare Parts and order the service manual. al. Read more »

"Growler" armature tester

rating: 5

I have recently aquired an old Allen Electric Type E30 armature tester. It's a simple device but I suspect the wiring has been tampered with/modified. Does anyone know the wiring of these devices? ... Read more »

Actual Ampacity Rating ROMEX SIMPull Type NM-B in a residential attic.

rating: 5

Please help me keep from tearing my hair out. I am installing a subpanel in an existing, small 22 by 8 foot (176 sqft) addition to my home. The original wiring was not done to code and has since b... Read more »

Help/air compressor tripping 20 amp breaker

rating: 5

I have a 58' run of 12/3 wire running to the shed that operated some lights and a small 110v sears 30 gallon air compressor nearly new. The first time or two of turning it on to build air the breake... Read more »

quadrant-eleventh-gram-second system

rating: 5

What is the quadrant-eleventh-gram-second system of units? What is the significance of quadrant ? What is the significance of eleventh ? What is good reference? Bill -- An old man would be better of... Read more »

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