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-   -   Existing wiring (with diagram sketch) - is it ok to leave alone or should I rewire (http://www.diychatroom.com/f18/existing-wiring-diagram-sketch-ok-leave-alone-should-i-rewire-68025/)

Snav 03-31-2010 02:46 PM

Existing wiring (with diagram sketch) - is it ok to leave alone or should I rewire
 
Sketching up the deal is easier than trying to get a good photo in the attic of the issue in question.

So I'm wiring for the bathroom and this is the present setup:
http://i59.photobucket.com/albums/g2...ghtdiagram.jpg

Now - before I dug through the insulation to see the wiring I was planing on leaving it all alone, reusing the existing wiring and just replacing the light-fixtures but now that I see what was done I'm not sure if I can.

I've tried to read up and determine how acceptable this is but there's no pinpoint answer to this.

So - ok to leave or do I need to redo?

brric 03-31-2010 02:54 PM

I would say it is fine unless you are replacing the fixtures with new ones that require 90 deg. C conductors and the existing conductors are not so rated.

Snav 03-31-2010 03:02 PM

The old wiring is NM-B so I should be good then.

Thanks :)

brric 03-31-2010 03:04 PM

Yes, NM-B conductors are rated at 90 deg. C.

Snav 03-31-2010 03:55 PM

Thank you, appreciate it - I was really not looking forward to having to rerun the wires :)

Scuba_Dave 03-31-2010 04:53 PM

Myself I replace any wiring without a ground

Snav 03-31-2010 05:11 PM

A lot of my receptacles and so forth aren't grounded so I'm fishing ground wire through separately - I'll simply add it onto this in the same manor.

Gary in WA 03-31-2010 09:35 PM

Don't forget the GFCI required in the bathroom........ ground or not. Whoops, ceiling lights, ah well - a good thought anyway.

Be safe, Gary

andrew79 03-31-2010 09:38 PM

Quote:

Originally Posted by Scuba_Dave (Post 422301)
Myself I replace any wiring without a ground


by far the best way to do it....so much stuff depends on the ground these days and far too many people just plop a three prong outlet on old wire.

then they wonder why they're electronic equipment suddenly stops working :laughing:

Snav 04-01-2010 12:47 PM

Quote:

Originally Posted by GBR in WA (Post 422457)
Don't forget the GFCI required in the bathroom........ ground or not. Whoops, ceiling lights, ah well - a good thought anyway.

Be safe, Gary

Got it covered. :)

You know all those bad experiences that people give keen advice in order to steer someone from ever going through it - well, I've been through all that. :laughing:

Wildie 04-01-2010 07:40 PM

Quote:

Originally Posted by andrew79 (Post 422458)
by far the best way to do it....so much stuff depends on the ground these days and far too many people just plop a three prong outlet on old wire.

then they wonder why they're electronic equipment suddenly stops working :laughing:

The Ontario Electrical Safety code allows ungrounded receptacles to be replaced with GFCI receptacles.

I assume that you are saying that the electronic equipment may fail if its surge protector doesn't have a grounded electrical supply! I'm unsure whether this is a fact or not, but my home, built in 1948 was wired with ungrounded Romex, and I have yet to have any of my electronics damaged due to this!
The intent of having grounded outlets was to ground the case of electrical appliances in case a short circuit occurred from the hot conductor to the case. It would then force the breaker to trip, thus protecting users!
Now we see double insulated devices, that do not require a ground for this purpose, so is it possible, that in the future grounded outlets will become obsolete?

andrew79 04-01-2010 08:07 PM

Quote:

Originally Posted by Wildie (Post 422881)
The Ontario Electrical Safety code allows ungrounded receptacles to be replaced with GFCI receptacles.

I assume that you are saying that the electronic equipment may fail if its surge protector doesn't have a grounded electrical supply! I'm unsure whether this is a fact or not, but my home, built in 1948 was wired with ungrounded Romex, and I have yet to have any of my electronics damaged due to this!
The intent of having grounded outlets was to ground the case of electrical appliances in case a short circuit occurred from the hot conductor to the case. It would then force the breaker to trip, thus protecting users!
Now we see double insulated devices, that do not require a ground for this purpose, so is it possible, that in the future grounded outlets will become obsolete?

not likely.....and some electronics stiplulate the there must be a ground connected for them to work properly. I actually had another post going in here where because of no ground electronic ballasts were inducing a voltage into the ceiling grid.
Part two of this is that in the event of a lightning strike the ground is what saves lives.
A third thing to mention would be what happens if your short happens in a wall or a box. That box is now live.
No the new code books are actually getting more strict on ground use rather than more lax. Grounds save lives.....period.

Snav 04-05-2010 11:21 AM

Well - it wasn't fun but it's done. I found a few "eaten" parts of the existing wire (rats - old damage) while hanging my durrock so I rewired it all as a continual circuit rather than the mega-branch and just fed the new wire with ground in properly.

I didn't want to do it but now that it's done it wasn't *that* bad and only took a day.

Leah Frances 04-05-2010 11:32 AM

Quote:

Originally Posted by Snav (Post 424272)
Well - it wasn't fun but it's done. I found a few "eaten" parts of the existing wire (rats - old damage) while hanging my durrock so I rewired it all as a continual circuit rather than the mega-branch and just fed the new wire with ground in properly.

I didn't want to do it but now that it's done it wasn't *that* bad and only took a day.

:thumbup: you get 100 awesomeness points for doing it right the first time :thumbup:


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