Old homes with no ground

[augie47]

Note if you are changing out the receptacles, 406.4 requires to new ones to be AFCI or AFCI protected so I would try a dual function breaker first.
With knob and tube the breaker may be problematic but try it to see so you don't have to address AFCI receptacles,

 

[electrofelon]

Several times have left 2-prongs and ran new circuits to provide a 3-prong ea room

Yeah depends on what one is looking to accomplish. I would be more concerned about replacing the old wiring which may be at the end of it's useful life and have questionable insulation and connections. I'm not too worried specifically about "not having a ground"

 

[LarryFine]

Several times have left 2-prongs and ran new circuits to provide a 3-prong ea room

Agreed. Leave the existing circuits alone, and provide a new dedicated circuit to the new load.

 

[tom baker]

You will be better off to pull new NMB. Old wiring tends to get hacked with flying splices, etc. New BC wiring eliminates unknowns

 

[tom baker]

And 406.4 requires TR, WR, GFCI,AFCI for any replacement receptacle if location requires in current code.

 

[Little Bill]

Of course.

I was responding to the quote before yours and your reply. Take note of the words "only" & downstream".

 

[Little Bill]

What do you mean all the gfci receptacles as well, those protect themselves since they are gfci

Re-read what I wrote.

 

[LarryFine]

Not only downstream, but at the GFCI receptacle as well!

I took "only downstream" to mean as opposed to those upstream.

 

[Little Bill]

I took "only downstream" to mean as opposed to those upstream.

Just trying to make sure the OP understood.

 

[RPetty]

2. would I have to put a gfci in each ungrounded outlet or will one protect the whole circuit


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Wouldn't just one GFCI outlet cover just 6 outlets downstream?


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[Ponchik]

Wouldn't just one GFCI outlet cover just 6 outlets downstream?


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As many receptacles or outlets that is connected to the load side.

 

[RPetty]

I was always told that the number of "labels" with the device is the max

Good to know

Thank You


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[Ponchik]

Honestly I wouldn't worry about it for most residential outlets as most general resi stuff doesn't have three prong plugs anyway.

I agree.

 

[augie47]

I was always told that the number of "labels" with the device is the max

Good to know

Thank You


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Mod Note: Please update your profile to show occupation/ relationship to the electrical industry

 

[jmellc]

Many older houses have shallow boxes, some bevel back. You would have a hard time with most and it would be impossible to put a GFCI into a bevel back box.

 

[ptonsparky]

Remember, GFCIs will work without an EG but you become that path to earth if there is a fault. It will hurt.
Generally there is a limit to the length of conductor on the load side of a GFCI, not the # of devices.

 

[ptonsparky]

Many older houses have shallow boxes, some bevel back. You would have a hard time with most and it would be impossible to put a GFCI into a bevel back box.

You just need a bigger hammer, or a box extension.

 

[Ponchik]

Remember, GFCIs will work without an EG but you become that path to earth if there is a fault. It will hurt.
Generally there is a limit to the length of conductor on the load side of a GFCI, not the # of devices.

Limit on length of wire?

 

[ptonsparky]

Limit on length of wire?

Yes. Some leakage occurs.

 

[Ponchik]

Yes. Some leakage occurs.

I assume it is length limit from the GFCI breaker and not the receptacle GFCI, correct?

What is the length limit?

ETA, you know, I vaguely remember I read something on this year's ago. I will check in the UL book and see if it was there.