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Greetings from Fresno California, where we have a 1920's or 30's house that I have started to rewire. I will have other projects with the house but the rewiring takes priority now. I will give some updates and ask questions in the electrical forum as I go along.



For entertainment purposes only, I will describe a few of the issues which convinced me to do a rewire.



Not long after getting the house, my wife buys a new different back porch light. I remove the old fixture and see that there is no box, only two wires potruding from a hole in the stucco. (Its an old house, to be expected). I turn the power back on to see which wire is hot. Mark that wire. Turn the switch off...... doulble check voltage in the wires. Both wires now have 120 V. Turn the switch on; one wire has 120 v. Turn switch off, both wires have 120 V. Do this a couple times as I have to convince myself. Look at wall and roof line and wonder how bad it will be to fish new wire to this location.



A bathroom light quits working. My noncontact volt detector picks up voltage everywhere in the bathroom. I'm freaking, but a check of the actual voltage shows low voltage. There is 120 v to the switch itself. There is new nm cable to the switch and light, but in the attic, I find knob and tube going into the wall. I cuss at unknown persons for awhile. I trace wires and think I may have found a problem in a loose wire, but I am really puzzled and am reluctant to connect it. I bring up an electrician, he checks a few things connects the loose wire into the neutral circuit and the bathroom light works again. But I am puzzled. That wire had been disconnected sometime in the past (not just a loose connection) and the light had been somehow working for some time. Weird.


An outlet in the bedroom adjacent to the same bathroom has a bad outlet; no ground, 120 v with no load, but almost zero volts when a load is applied. Obviously a bad connection on the power or neutral. My testing indicated the bad connection was on the power side. I figure I'll bring in some pros. These electricians trace out the knob and tube to that outlet and decide that there is a loose neutral. The fasten it securely and the outlet works again. They claim that the wiring updates in the attic are the worst they have ever seen. I new it was bad and "worst" didn't surprise me. The electrician says it needs a complete rewiring job at around $8,000 and they could get to it in the fall when it is cool enough to work all day in the attic. He also suggests that we cut the walls where the wires need to go so they don't waste their time doing that. Oh, and hire somebody to remove all the blow-in insulation so they can see where the wires go. Good idea actually.


Two months later, the outlet quits working and the bathroom lights and fan quit working. A day or so later, they work for awhile in the afternoon, but quit working again in the evening. Photocell??? A few days later, they work again for a few hours in the afternoon, then didn't work for several days. I get in the habit of checking to see if they work and one evening notice that two outside lights come on when I turn on either the shower light or the shower vent fan.



I like puzzles, and someday I will figure out a circuit that will cause these effects, but in the meantime, I went into the attic and cut all the knob and tube wires above the master bedroom that connect those fixtures. I have started running new wires and putting in new boxes and will put them on a new circuit. I figure no electrician on the clock has the time to fix this mess in a reasonable way. Where I have the time to work on it one circuit at a time, run new wires replace every nongrounded box and make it all neat and logical so the next guy can see what it going on. While at it I can work on various other problems as well. And I can work on it for a few hours at a time when the attic is cool.
 

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Welcome.
I have done the same to a couple Victorian houses I have lived in and own. Knob and Tube was great for the devices they had back then. But always causes a lot of head scratching today. You have elected to do the right thing by just starting over with all new. You can wire the new in parallel to the old and then on a single day do the cut over.
 

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Im an electrician 40+ yrs Industrial comm. LOTS OF HOME REWIRES. Im in a house now It was on a 100 amp fuse panel,With all kind of crazy looking conduit ran out of it.14 ga.in most on 30 amp fuses they ran this to the in floor& baseboard recepticles.still connected to nob n tube. I was able to rewire in 12ga thhn through conduit I extended the circuits with 12 ga.romex all bonded.Im happy with this.NOW All lights in 7 rooms and are on 1 circuit all knob n tube. this has been added on by a novice at best. they put a pancake box on a joist wired romex to nob n tube wirenuts in joist cavity. Ive got some major,rethinking to do one this 1
 

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I took this house from 60 amp service to 800 amp service. I now have a 200 amp panel per floor and a 200 amp panel for the kitchen. I used all bx cable. It is now called MC. We have no issues with anything now. I designed this so that half of each room is on one circuit for power. The ceiling light is on a circuit by itself. I never mix power and lighting on the same circuit. I have all 120 volt circuits on AFCI/GFCI breakers. Even though they are not all required yet. It is easier and looks better in the panels when they all look the same. I could get only GFCI for the 240 volt breakers. I did this house little at a time, and then did the cut over. After the cut over I still had circuits that needed to be pulled. But it all passed inspections with the power company and the inspector. The power company was very happy to give me a meter. When I first my the project engineer, he told me "that we will be happy to sell you all the power you want. Are you sure 800 amp is enough". lol
 

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What is even more funny is that our electric bill has dropped in price since the cut over. I used conductors larger than specified. For example, the electric dryer on a 30 amp circuit only needs a 10 AWG size. I used 6 AWG size copper. Less resistance, less current. Use Ohm's law to figure out the numbers. I had a different engineer when I build the workshop in the back yard. But she told me that she had heard about the house. She asked what size I wanted for the workshop. Wrote it up and had the transformers on the other street changed to accommodate. The workshop sits closer to the other street that goes behind the house. And I built a driveway off of that street into the workshop. I had a home owner on that street come up and say "Thanks for having the power company change out that transformer. Now our electric is more stable". Glad I could help out a neighbor
 
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