I recently installed a new circuit line. I went in to the crawlspace to install the new line in a junction box that had a circuit for an old AC unit. This circuit was old BX cable and is not grounded. I can not run the line back to the circuit breaker box because it is in a bed room and I would have to break the sheet rock. A few feet away from this old AC circut is a new circuit that was run for a septic ejector pump. I can not tie in to that circuit, but Can I tie the ground to this new grounded circuit? The grounding system for a house is all tied together, does every circut have to have its own ground run to the circuit breaker box?
Thanks D.C.
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Properly installed BX is grounded. The armor is the ground.
Like Bill said; though check the BX for good ground, since connection point can get corroded, or the jacket may not manage to have conductivity all the way back to the main for any number of reasons.
If BX jacket ground is good, attach ground conductor inside metal junction box with proper screw. Generally there is a threaded hole for this very purpose, though you can tap your own if needed.
I would not 'borrow' the ground on the other circuit. Doubt very much that would meet code...
Check Section 250-130 (c) of the ignoble Code. You might be able to get away with this ["borrowing" the ground wire from another circuit] as long as both run to the same panel. It is more important to have a good, low impedance ground to the originating panel than to follow the daintiness of the Code.
~Peter
>>than to follow the daintiness of the Code.
Where were you when I needed you???
EricI Love A Hand That Meets My Own,
With A Hold That Causes Some Sensation.
Thank you for your advice.
thank you for your help. I would rather be safe then follow the code to the letter.