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Old 06-24-2010, 09:17 AM   #1
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100AMP Main board off a 100AMP Main Fuse


Hi Wonder if I can safely do the following.
Currently I have a 100AMP Main Fuse connected to an 8 circuit fuse panel with a 8 circuit subpanel (circuit breakers).

I need more circuits but not more than 100AMPs for my house. I was told it would be safe to leave the 100AMP Main fuse and connect that to a new load centre, 100AMP circuit breaker and rip out both the old 8 circuit breakers and 8 circuit fuse panel, leaving just the main 100AMP Fuse connected to the new 100AMP load centre. IS THIS SAFE?

Thanks
Colin
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Old 06-24-2010, 10:14 AM   #2
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Will the main fuse be next to the new panel? If so, you can use a main lug panel and save a few bucks. Can you post a picture of the current setup?
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Old 06-24-2010, 10:31 AM   #3
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I would install a 100 amp main breaker panel. More spaces and no need to keep fuses around.
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Old 06-24-2010, 11:12 AM   #4
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If you rip out the old panel, 100 amp fuse and all, you will need the help of your power company to shut off the power at the meter while you hook up your new panel.

By yourself you can pull out the fuses (I take it they are in a carrier that pulls out to disconnect all power) and connect the fuse output lugs to your new panel leaving the old panel in place. Run #2 copper wires (the ground can be #4) through a conduit between the panels or use 2-3 copper Romex type cable with ground. Here your new panel is technically a subpanel and all neutrals including the fat one from the fuse box must be brought to a bus bar that is not bonded to the panel itself or to ground wires.

Lug panel -- Has no main breaker up top.
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Last edited by AllanJ; 06-24-2010 at 11:23 AM.
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Old 06-24-2010, 08:11 PM   #5
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Pictures of current setup


Hi all

Here are pics of the current setup. As you can see I would like to leave the main 100AMP on the left and contect that to the new 100AMP load centre. The reason I got the 100AMP load centre with the 100AMP circut breaker is it is a package deal and saves me a ton of money. But can I do that without burning down my house? LOL

Thanks again
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100AMP Main board off a 100AMP Main Fuse-picture8.jpg   100AMP Main board off a 100AMP Main Fuse-picture9.jpg   100AMP Main board off a 100AMP Main Fuse-picture10.jpg  
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Old 06-24-2010, 08:15 PM   #6
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Thanks AllanJ


you hit the nail on the head. I don't want to bother with getting my ulitily to come in and turn off the power that is why I am hoping to leave the old main 100AMP fuse and just go with the load centre. what do you think? I posted pics

Colin
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Old 06-24-2010, 09:17 PM   #7
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So you already have the new load center? Does the 100 amp breaker operate left to right or up and down? If it operates left to right you can mount the panel so the 100 amp disconnect is at the bottom which will allow you to use the existing copper feed.
What is the red wire that leaves the top of the 100 amp fuse box and what are the white and black wires connect to the neutral bus? You will have to add a ground wire too.

Last edited by a7ecorsair; 06-24-2010 at 09:27 PM.
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Old 06-24-2010, 10:04 PM   #8
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I'm guessing red is the ground, but it should probably be green.

I have a similar setup (cut off switch, then panel) and plan to eventually replace my whole panel with a 200 amp one. That's the nice thing about having a separate cut off switch. Normally they'd have to pull the meter and then it has to be a pro that does the work. (this may vary per region)
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Old 06-24-2010, 10:38 PM   #9
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Red wire and black and white


Good question guys. When I first opened it up and saw the black and white into the box, I went what the hell? I think those are actually my ground but I have not confirmed it completely. They appear to run off in the direction of my water main and when I check that end there is a white and black connected to the water main on the supply side.

As far as the red wire, it does not seem to be connected to anything. Any thoughts?

It is a Siemens XP32100 load centre and the 100 AMP circuit operates left to right. Is it even possible to remove that and just us it without that?

Colin
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Old 06-24-2010, 11:17 PM   #10
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Quote:
Originally Posted by cmarcus3031 View Post
Good question guys. When I first opened it up and saw the black and white into the box, I went what the hell? I think those are actually my ground but I have not confirmed it completely. They appear to run off in the direction of my water main and when I check that end there is a white and black connected to the water main on the supply side.

As far as the red wire, it does not seem to be connected to anything. Any thoughts?

It is a Siemens XP32100 load centre and the 100 AMP circuit operates left to right. Is it even possible to remove that and just us it without that?

Colin
If you remove the breaker you won't have any lugs to mount the wires.
Yup, those two wires are the ground.
You are going to have one stumbling block with the fuse box. You need a #6 ground wire to replace that pair of #12s and you will need to pull a ground wire (green) from the new panel to that little short neutral bar. There appears to be a pair of wires from the neural bar going up to a ground ring on the incoming conduit. Not sure if that is required - it would open up a spot on the neutral bar.
Lets see what other say about the grounding.
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Old 06-25-2010, 09:34 AM   #11
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changing the ground wire


Why are you suggesting I change the existing pair of #12 ground wires to a single #6, is that new code in your area? I will check my code book for Ontario when I get home.
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Old 06-25-2010, 09:54 AM   #12
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I didn't realize you are in Canada. The #6 was just a thought so maybe you won't have to do anything with it.
Also, maybe your code will not require the bonding between the new panel and the fuse panel since it is run in threaded conduit.

Last edited by a7ecorsair; 06-25-2010 at 09:57 AM.
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Old 06-29-2010, 11:19 AM   #13
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So in a nutshell am I ok to go from the 100AMP fuse to the new 100AMP breaker in the board?

Thanks
Colin
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Old 06-29-2010, 11:23 AM   #14
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Quote:
nutshell
I say yes.
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Old 06-29-2010, 11:34 AM   #15
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Great, are you an electrician? lol


I might just do it later today, once I get some power from my neighbour

any idea what that red wire is? It is not connected to anything?

So I was planning to use the current wires that are connected to the subpanel (fuse) to connect to the new breaker panel? Right choice?
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