It is 9 without any derating. Actually, you can put as many wires in a conduit as you want. They just have to be derated according to Table 310.15(B)(3)(a) of the NEC.
How many wires can you put in one staple?
It is not permissible to secure more than one 3-conductor cable under a single staple. Use stacker-type fasteners to secure multiple cables to the same framing member. These allow the cables to be stacked for a neater, safer installation.
Can you run multiple electrical wires through the same hole?
The Answer According to the National Electrical Code, you can have 4 12/2 nonmetallic sheathed cables through a single bored hole that is fire- or draft-stopped using thermal insulation, caulk, or sealing foam, or where proper spacing is not maintained for more that 24 in.Dec 2, 2013
How do you use a cable stacker?
https://www.youtube.com/watch?v=QijTYA5oJEg
How many wires can you put in a stacker?
In the field, anything more than two wires at a time is known as a stack. Most metal and plastic staples or 'wire holders' can hold stacks of up to six to eight (6 to 8) Romex wires under them. You can stack even more if you can fit them or use thinner wires.
Can cable stackers be used horizontally?
SI-1 allows the installation of multiple NM or UF cables on one side of a 2 x 4 in vertical or horizontal raceways.
How do I use multi cable staples?
https://www.youtube.com/watch?v=Aj0laqfC8us
Can two Romex cables be stapled together?
When stacking multiple Romex wires under one staple, the general rule of thumb is to always wire just one wire per stable, and if you really must, staple no more than two wires side by side. Most metal and plastic staples or 'wire holders' can hold stacks of up to six to eight (6 to 8) Romex wires under them.
Can you put two wires one staple?
Secure only one cable under each fastener, in most cases. Sometimes it is permissible to secure two 2-conductor (plus ground) cables under a single staple, for example, but it is preferable not to double up cables. It is not permissible to secure more than one 3-conductor cable under a single staple.