32 mm (1 1/ 4 in.)

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Son

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Hello everybody;

"32 mm (1 1/ 4 in.)", this is the minimum distance to protect against damage cables and raceways in article 300.4.
And with the other dimensions, measurements, in NEC.

Where do they come from ??? :)


Thank you.
Son
 
Son said:
Hello everybody;

"32 mm (1 1/ 4 in.)", this is the minimum distance to protect against damage cables and raceways in article 300.4.
And with the other dimensions, measurements, in NEC.

Where do they come from ??? :)


Thank you.
Son
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300.4 when you drill a hole in a 2x4 wood stud they want you to install nail plates to protect the romex that your runing through the stud the mesurment is 3/4" in mass so you have to install nail plates;)
 
This 1.25" would also apply to a cable nailed parallel the the stud too. Why 1.25" is anyones guess. A larger dimension, say 1.5" would only allow a 1/2" hole without the use of protection and the hole would have to be perfectly centered on the stud. The idea is to protect the cable from the penetration of a nail or screw.
 
Son said:
Hello everybody;

"32 mm (1 1/ 4 in.)", this is the minimum distance to protect against damage cables and raceways in article 300.4.
And with the other dimensions, measurements, in NEC.

Where do they come from ??? :)


Thank you.
Son
Click to expand...

I think I understand your question. You are asking how they come up with the particular measurements? Probably just from normal operating procedures on construction sites. 1.25" was probably deemed enough clearance for the average drywall screw, towel bar anchor, etc.
 
Son said:
Hello everybody;

"32 mm (1 1/ 4 in.)", this is the minimum distance to protect against damage cables and raceways in article 300.4.
And with the other dimensions, measurements, in NEC.

Where do they come from ??? :)


Thank you.
Son
Click to expand...

Edison's pinky finger was 1 1/4" long :)
 
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