32 mm (1 1/ 4 in.)

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Son

Member
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
 

LEO2854

Esteemed Member
Location
Ma
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

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;)
 

infinity

Moderator
Staff member
Location
New Jersey
Occupation
Journeyman Electrician
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.
 

Split Bolt

Senior Member
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

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.
 

jusme123

Senior Member
Location
NY
Occupation
JW
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

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