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Fuse box to CB Panel - logistics

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Fuse box to CB Panel - logistics RichK 07-27-2007
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Posted by RichK on July 27, 2007, 11:34 am
Hi All,

I'm sure it's been asked a million times and answered, but I'm not getting
any google hits on the specific point.

When replacing a fuse box with circuit breaker panel in a 50's house, how
does an electrician mange to transfer all the cables from one to the other.
They will not be long enough in most cases, even if the new box is put in
the exact space.

There's nothing wrong will the existing cables in the house, but they would
not be long enough to connect to anything else except the existing fuse box.

Can one install some sort of small terminal block box above existing fuse
box and use it as an interconnection box, then jumper all the cables to the
new CB panel?

Regards,

RichK





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Posted by Joe on July 27, 2007, 12:15 pm

RichK wrote:
> Hi All,
>
> I'm sure it's been asked a million times and answered, but I'm not getting
> any google hits on the specific point.
>
> When replacing a fuse box with circuit breaker panel in a 50's house, how
> does an electrician mange to transfer all the cables from one to the other.
> They will not be long enough in most cases, even if the new box is put in
> the exact space.
>
> There's nothing wrong will the existing cables in the house, but they would
> not be long enough to connect to anything else except the existing fuse box.
>
> Can one install some sort of small terminal block box above existing fuse
> box and use it as an interconnection box, then jumper all the cables to the
> new CB panel?
>
> Regards,
>
> RichK


Posted by Joe on July 27, 2007, 12:26 pm
> Hi All,
>
> I'm sure it's been asked a million times and answered, but I'm not getting
> any google hits on the specific point.
>
> When replacing a fuse box with circuit breaker panel in a 50's house, how
> does an electrician mange to transfer all the cables from one to the other.
> They will not be long enough in most cases, even if the new box is put in
> the exact space.
>
> There's nothing wrong will the existing cables in the house, but they would
> not be long enough to connect to anything else except the existing fuse box.
>
> Can one install some sort of small terminal block box above existing fuse
> box and use it as an interconnection box, then jumper all the cables to the
> new CB panel?
>
> Regards,
>
> RichK

Common practice is to install new meter base, weatherhead and run new
wiring to the breaker panel. Although old cables may look fine, they
could well be undersized and not adequately temperature rated vs.
current standards. The power company then installs a new service drop
from the pole.
Short of that, for whatever reason, it is easy and cheaper to unplug
the meter and simply run new cable to the new panel than to install a
junction box and splice in more wire. That would not be applauded by
your power company in any event. HTH

Joe




Posted by RichK on July 27, 2007, 12:39 pm


> Common practice is to install new meter base, weatherhead and run new
> wiring to the breaker panel.

This is being done.

> than to install a junction box and splice in more wire.

But how do you transfer all the existing 10-14 ga wires from the existing
fuse box, to the new panel. Even if located in exact same spot, the
geometry is different and many of these will not be long enough. Is there a
clever way to "extend" them :-) That is why I asked if a box with terminal
strip can be used for this purpose. Such box could be physically located
above present fuse box, to make sure existing cables would be long enough.

RichK



Posted by Pete C. on July 27, 2007, 3:25 pm
RichK wrote:
>
>
> > Common practice is to install new meter base, weatherhead and run new
> > wiring to the breaker panel.
>
> This is being done.
>
> > than to install a junction box and splice in more wire.
>
> But how do you transfer all the existing 10-14 ga wires from the existing
> fuse box, to the new panel. Even if located in exact same spot, the
> geometry is different and many of these will not be long enough. Is there a
> clever way to "extend" them :-) That is why I asked if a box with terminal
> strip can be used for this purpose. Such box could be physically located
> above present fuse box, to make sure existing cables would be long enough.
>
> RichK

The norm for the installations I've been involved in is to install a
decent sized pull box up high where all the existing house feeds can
comfortably reach and connect from there to the new panel with conduit.
The various circuits in the pull box are then connected back to the new
panel with new individual conductors. To contain the wiring mess a
ground bar can be installed in the pull box with a larger single ground
conductor returning to the new panel. The neutrals all have to go back
to the new panel individually as do the hots.

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