10ft Tap Rule

[joesmoeblue]

Hello, I am upgrading a service for a duplex. They currently have 60 amp services with fuses. My first question is, If the wire is big enough to handle a 100 panel, can I just install the two panels and leave the system the way it is?(without adding a disconnect to the outside) My next question is I was thinking of putting a 200 amp disconnect on the outside for the two panels. Based off the 10ft tap rule I would have to run the service wire(feeder wire) in some type of conduit....meaning I couldn't use 4-4-4-2 se cable? Lastly, can I run just one ground rod or do I need one for each panel? Thanks

 

[Dennis Alwon]

Hello, I am upgrading a service for a duplex. They currently have 60 amp services with fuses. My first question is, If the wire is big enough to handle a 100 panel, can I just install the two panels and leave the system the way it is?(without adding a disconnect to the outside) My next question is I was thinking of putting a 200 amp disconnect on the outside for the two panels. Based off the 10ft tap rule I would have to run the service wire(feeder wire) in some type of conduit....meaning I couldn't use 4-4-4-2 se cable? Lastly, can I run just one ground rod or do I need one for each panel? Thanks

Joe how can we tell you if the wire is big enough for a 100 amp service if we don't know what size the wire is. If the wire is sized for 60 amps then I it would not work for 100 amps. Are you talking about the riser wire or service lateral, or just the wires to the disco.

 

[cpal]

Hello, I am upgrading a service for a duplex. They currently have 60 amp services with fuses. My first question is, If the wire is big enough to handle a 100 panel, can I just install the two panels and leave the system the way it is?(without adding a disconnect to the outside) My next question is I was thinking of putting a 200 amp disconnect on the outside for the two panels. Based off the 10ft tap rule I would have to run the service wire(feeder wire) in some type of conduit....meaning I couldn't use 4-4-4-2 se cable? Lastly, can I run just one ground rod or do I need one for each panel? Thanks

1. if the wire is good for a 100A panel or load center then, Yes!.

What size wire would one need to provide a 100A feeder to a individual dwelling unit??

2. You might be able to install two panels but you did not explaine "the way the system is"

3. Check out 230. 71. Do you comply?

4. The tap rule 240.21(B) is for feeder taps. Are you running tapes from a feeder or are you running SE Conductors??


Kick this around and read the code refernces someone will help, you can work it out

 

[LarryFine]

Let's start with some proper and realistic load calculations, unless you're going to make sure everything is sized at full OCP.

I doubt a fused 60a service will have conductors that large.

 

[PetrosA]

Are the two existing panels on one meter? In other words, is this for one service or two? If it's one service, will it be allowed to stay that way since it sounds like you're dealing with separate dwellings, or are these rental units under the control of one landlord who includes a fee in the rent for electric?