Can I Feed 1/2 A Mwbc From A Combination Arc Fault Interrupter(caif) Breaker?

I have a mwbc where one is running my kitchen outlets, and the other is running a dedicated circuit for the disposal. the breakers are adjacent in the panel, so they are on opposite phase and share a common neutral and ground. I was updating the outlets and so turned off only one of the breakers. when I tested the line to make sure it was off, my voltmeter still read about 10 volts. Is this normal? there were no appliances connected to either circuit.
      

i have 3 switch sets in my house that are giving me absolute fits.



#1  kitchen switch, controls the light over the outside door




    Code:

   

3 sets of lines coming in,



line from the breaker panel (power)



line to the ceiling lights 



line to the outside porch light.

i cannot get this 3 line to work without tripping the breaker every time i turn the switch off



#2 bathroom switches




    Code:

   

power feed line



line to the light over the medicine cabinet



line to the second switch to control the exhaust fan.

same issue as the first set, flip the switch and trip the breaker (different breaker from the kitchen switch)



#3 living room switch and plug controlled via switch




    Code:

   

 power feed line



outside porch light line



line to wall switch to control the lower wall outlet

flip switch, trip breaker



the switches i have are "1 pole" am i using the wrong switches for this job?
      

I have 3 wire direct bury feeder cable from a 200 amp meter base/sub panel to a 125 amp sub panel on a post 150' away and the 125 amp sub panel will feed a 30 amp RV outlet box.

The 3 wire feed was already there and I know it is not to 2008 code, but my question is: do I need to bond the neutral bar to the ground bar and to a ground rod at the 125 amp subpanel?
      

hi guys,



Im a 1st year apprentice sparks so pretty inexperienced! i have a job on during the week to wire a bathroom extractor fan in for my friend. He wants it to come on separately from the bathroom light.



Theres a 2 gang switch outside  the bathroom, one for landing lights other for bathroom. So im thinking of replacing this with a 3 gang switch for the fan.



Im gonna take permanent feed from one of the two other switches ie(bathroom or landing) to the fan switch 'common' to power it, then also take a permanent feed for the fan from the 'common' side of this new switch as its a timer fan.



Then switch feed from L1 on new switch to fan. And finally neutral from bathroom light fitting to fan. I know that these 3 cables going to fan have to be isolated at another switch before going to fan!



Am I on the right track. Thanks in advance.
      

I usually install my plugs one after another but was wondering if you could feed a middle one and just feed to the one on the right and the one on the left from the middle.  I attached a 2 second paint picture to better explain.
      

Getting ready to replace my well jet pump with a 240 volt model (currently I use a 120 volt pump. Currently I have a 20 amp, 120 volt circuit that runs from the house to the pump house about 60 feet. I use that circuit for the pump, a light and a receptacle. I want to replace that circuit with a 20 amp MWBC using 12/3 UF cable from the sub panel in my detached barn to the pump house (about 20 feet).



Question: Can I use 1/2" seal-tite to run from the sub panel to a a junction box prior to going underground with the 12/3 UF? The seal-tight run would be about 30". (I have a bunch of seal-tite, connectors and #12 THWN that I bought cheap at a storage unit auction.) The seal-tite would be run in the stud bay and along side the ceiling joist to get from one side of the barn to the other.



Question: Can I use an unfused air conditioning disconnect at the pump house to disconnect the 2 ungrounded conductors of the MWBC.



I can find nothing in the NEC that would bar either of these items, but I am a code novice.
      

I am replacing a feed through breaker panel the bus bar and breaker was inverted but the main breaker is up and down with on being down and I also noticed that the plastic in the back that holds the bus bar is cracked.



I bought a newer model from the same manufacture that has a much better design and a better main breaker.  But unlike the one I already have when you invert it the breaker slots don't line up and cover does not fit properly.



I was thinking about just cutting out the center where the breaker slots are.  I measured and if I cut it just right all I have to do is turn it over and it will line up just have to bolt or weld it in place.  Would this be legal



I also thought about putting the panel the way it came and feeding the bus bar hot and keeping the panel under the 6 throw rule.  Or would that not work because I am using feed through.  There will be 4 double pole breakers and the one main that feeds a sub panel.





I really hate the cheap design of this panel.







I plan to replace it with this.




      

I'm installing a 2.8kW fan assisted oven (no hob) I done some cable sizing calculations and voltage drop calculations and added 50% overload in aswell and I found I could use a 2.5mm cable to supply it. I also found I could use a 20A MCB, a friend said that he would use a 32A to be safe but didnt give me any other reasons why? Is this better or would it stop it from tripping under fault conditions? Is it also acceptable to use a 20A double pole switch to isolate it?



Thanks for any feed back
      

Is it o.k. to use 12/2 to make a pigtail off 14/2 wiring. Have hot feed coming in to switch that feeds ceiling fan/light (14/2). It is also hot feed for receptacles. I am replacing manufactured home style switch and installing normal switch and remodel box into wall. I just don't have any spare 14/2 laying around bit do have some 12/2. I was pretty sure can go up in wire size especially just for pigtails but wanted be 100% certain.



           Mike
      

I'm new to this site.  But would appreciate some troubleshooting.  I just renovated my kitchen, gutted and all, finished in the Fall.  I did not replace wiring to the dryer, nor tamper with it, to my knowledge.  We did have an electrician add a small fuse panel.  We did not add more appliances then before, added some lights, but mostly used the room to separate things out.  Had a mentor do the wiring, many years of experience, very tidy and careful work, though not electrician by trade.  We have a standard 200 amp box as far as i know.  The house is 100 years old, but the wiring isn't.



In October my mother in law heard a very loud bang.  The electric dryer had been running.  She smelled smoke.  At the dryer receptacle was molten plastic sprayed onto the wall, caused by overheating at that point, due to I don't know what.  I thought maybe I had knocked something loose in the receptacle when i was drywalling around it.  I can't remember now if the breaker had tripped.  The receptacle and plug were toast. 



I replaced the receptacle, I replaced the dryer cord, not the breaker.   The dryer worked fine until february, when it stopped heating.  I found a bad thermal fuse and replaced it, the very common two pronged white one. 



The dryer worked fine until early April when it stopped heating again.  I checked all the fuses/thermostats on the back and the heating element, as I had done the first time.  Nothing was bad.  I checked the voltage coming out of the wall, as I had done the first time, only this time I did it correctly and got a reading that told me to check the breaker in the panel, which had not thrown.  When I checked the voltage between the Nuetral Bus and the two terminals on the Dryer's 30 amp breaker I only got a good reading on one of them, telling me that the breaker was bad.  While at the box, i noticed that to the main breaker, from where the conduit comes into the box from outside, the nuetral wires are bare all the way up, no insulation, and at the terminal of the main breaker they appear to have all melted together, even a couple small pieces have melted off of the "bundle." 



Switched the range 50 amp breaker with the dryer, dryer worked fine, nothing was back fed either.  Bought a new 30 amp breaker for the dryer and installed it on Saturday.  Also on Saturday we were given a dryer, about 4 years old, same as ours, so i hooked it up and saved ours for a spare, which I deemed still good since it seemed the breaker was the issue.  New Dryer worked fine from saturday until today.  Now it won't turn on, though it didn't cut out mid load yesterday either.  The breaker did not trip.  I repeat, no tripped breaker.  I just checked the voltage at the wall and it seems to have that same problem where one side of the receptacle gets a reading of 120, and the other a reading of about 5.  The problem must be bigger than the breaker.  I am not an electrician, I am a welder.  I have gone as far as I could on my own.  Thank you.