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-   -   Mini breakers in control panel or no? (http://www.homebrewtalk.com/f170/mini-breakers-control-panel-no-221261/)

fourem 01-28-2011 08:38 PM

Mini breakers in control panel or no?
 
Hello,
First time posting here. I am in the process of building a BCS-460 based E-HERMS. I need a second opinion on whether to install DIN rail mini breakers in my control panel vs. not?

My entire system is supplied and protected through a 50A GFCI breaker. I am going to be using 2 - 4500W LWD elements w/ manual switches for each. I am following the route that Kal has taken, using a 30A contactor w/ switch to allow power into the control panel where the entire panel is protected by the GFCI breaker. I have also seen the route of using a disconnect and mini breakers directly inside the panel to allow power to flow into it. I know you can never be too safe but wondering if it is absolutely necessary to install mini breakers in a system like the one I am building?

Cheers and thanks for any advice!

Walker 01-28-2011 11:19 PM

you need breakers or fuses to protect your equipment.

If you have 50A coming into your system, but have contactors that are rated for 30A, you should have a fuse or breaker between the incoming source and the contactor.

Plus, this will allow you to use smaller gauge wiring after the breaker.

I have 50A coming into my box and it immediately goes through some 25A breakers and drops down in wiring size for my 240V path. I also take one of the incoming hot lines and run it through a 15A breaker for my 120V items.

Bachhus 01-28-2011 11:37 PM

Would recomend mounting the breakers on the same DIN rail you spoke about to keep everything modular, this rail http://www.mouser.com/Search/Product...key651-1207640 ? Which style of breakers would you recomend?

Walker 01-28-2011 11:41 PM

I used panel-mount breakers in my system because they were so much cheaper. Lots of folks do use DIN rail mounted ones, though. I've not looked at them to form opinions other than that they are more expensive that panel-mounts. :D

Ohio-Ed 01-28-2011 11:53 PM

OP - In my opinion, you should definitely use over-current protection. You can use breakers, or fuses your choice.

I used DIN mount components because they were super easy to move around during initial layout and I didn't want to drill tons of holes. In reality, once you start wiring, you won't be moving the din components around any longer. So other than fewer holes to drill in the subpanel, I'm not sure there is a huge advantage.

Bachhus 01-28-2011 11:58 PM

Does a 'panel mount' breaker just get screwed into the back of the control box or do you have to get some other type of mounting system for them? Can you just go to HD or Lowes and buy the kind that you would put in your house box?

Thanks, as you can tell I havn't had much experience with this part.

Walker 01-29-2011 12:06 AM

Quote:

Originally Posted by Bachhus (Post 2594838)
Does a 'panel mount' breaker just get screwed into the back of the control box or do you have to get some other type of mounting system for them? Can you just go to HD or Lowes and buy the kind that you would put in your house box?

Thanks, as you can tell I havn't had much experience with this part.

The ones at HD or Lowes are not that easy to use. They are meant to be snapped onto power rails inside of a proper breaker box.

the panel mount breakers I use just need a hole drilled in the box. The "reset" button is then available outside of the box for you to press if the thing trips.

Bachhus 01-29-2011 12:30 AM

Quote:

Originally Posted by fourem (Post 2594324)
Hello,
First time posting here. I am in the process of building a BCS-460 based E-HERMS. I need a second opinion on whether to install DIN rail mini breakers in my control panel vs. not?

My entire system is supplied and protected through a 50A GFCI breaker. I am going to be using 2 - 4500W LWD elements w/ manual switches for each. I am following the route that Kal has taken, using a 30A contactor w/ switch to allow power into the control panel where the entire panel is protected by the GFCI breaker. I have also seen the route of using a disconnect and mini breakers directly inside the panel to allow power to flow into it. I know you can never be too safe but wondering if it is absolutely necessary to install mini breakers in a system like the one I am building?

Cheers and thanks for any advice!

Oh man sorry Fourem I just realized you were not asking about specific breakers more the requirements for them in your system. Sorry to totally sidetrack your post.

Mark

fourem 01-29-2011 12:39 AM

Quote:

Originally Posted by Walker (Post 2594860)
The ones at HD or Lowes are not that easy to use. They are meant to be snapped onto power rails inside of a proper breaker box.

the panel mount breakers I use just need a hole drilled in the box. The "reset" button is then available outside of the box for you to press if the thing trips.

Do you have a picture of the inside/outside of your control panel with your breakers? Any suggestions on where to purchase?

Bachhus 01-29-2011 01:09 AM

hope this link works but here are some I found at Mouser

http://www.mouser.com/Circuit-Protec...yzxeuvZ1yzxeux

I havn't figured out how to do the whole hidden link thing.


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