It's always something in Philadelphia....
History of Undergrounding Electrical Wires in Center City - http://www.philadelphiaspeaks.com/threads/history-of-undergrounding-electrical-wires-in-center-city.30345/
Two-phase electric power - https://en.wikipedia.org/wiki/Two-phase_electric_power
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History of Undergrounding Electrical Wires in Center City - http://www.philadelphiaspeaks.com/threads/history-of-undergrounding-electrical-wires-in-center-city.30345/
Two-phase electric power - https://en.wikipedia.org/wiki/Two-phase_electric_power
Join Team FranLab!!!! Become a patron and help support my YouTube Channel on Patreon: http://www.patreon.com/frantone
- Music by Fran Blanche -
Frantone on Facebook - https://www.facebook.com/frantone/
Fran on Twitter - https://twitter.com/contourcorsets
Fran's Science Blog - http://www.frantone.com/designwritings/design_writings.html
FranArt Website - http://www.contourcorsets.com
Connecting ground to neutral when there is no ground wire is worse than having an ungrounded outlet.If the neutral disconnects(loose connection,oxidation,wire breaks from bending,accidentally someone drills or cuts it) every grounded metalwork will be live.That places needs to be rewired.
I came here seeking information about 2 phase wiring.
Beautiful design on those transformers!
I'm having trouble wrapping my head around this. Regardless 2p or 3p the transformer creating the power (prob scott T) has potential from the 2 LEGS in your shop panel to ground at 120V. So as I look at it you are using the conduit system as a current conductor (besides the lack of a seperate ground). So you have 120 in the building but for some reason you dont have the 3rd conductor (call it a neutral here) in your shop panel that was marked 240 only in official sharpie? I'm open here, I understand I've never worked or been to phili but this is a strange one Fran. I'm going to copy and paste this in the 2020 pic you posted so it might get more eyes on it.
The American Electrician Handbook has great info on 2 phase systems.
It is not "wrong" if you are maintaining the standard already in use.
I just tried to open the page with the history of underground wiring in Center City, and the site gave a simple database error.
Three phase in the uk 230v
Interesting….wonder how safe it is.
Can you do a tour of the substation? Really interesting
Similar to how most installation (except the newly build housing areas) in Norway are done. We run 3-phases without a center-tap, so we have 2 Live wires + ground in each power outlet, giving 240 Volts.
New built power substations run at 400 Volts in order to be compatible, with the earlier 240 Volts system, giving 240 Volts between each phase and neutral. ALL THAT POWER!!!
I hate they are gonna tear down your building with that nice old technology.
Shading coils, capacitors, "start windings" and some "centrifugal switches", don't forget them.
Your channel is great.