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What is common practice or code when running new electrical lines in a home(15 amp/20 amp) in a basement that feed up to the 1st and 2nd floor of a home?

Is there a rule on how many wires can be run down the same floor joist overhead? In other words, If I need to run 10 new 15amp/20amp lines, can they bunched together and secured to the floor joist overheat safely, or is there a rule on how many can be together? And what is the rule if these wires need to cross a metal gas line?
 

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Small cables like that need to go through bored holes,or be on running boards.

There is no issue with touching the gas line..
 

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What is common practice or code when running new electrical lines in a home(15 amp/20 amp) in a basement that feed up to the 1st and 2nd floor of a home?

Is there a rule on how many wires can be run down the same floor joist overhead? In other words, If I need to run 10 new 15amp/20amp lines, can they bunched together and secured to the floor joist overheat safely, or is there a rule on how many can be together? And what is the rule if these wires need to cross a metal gas line?
When you say "run down the same floor joist", I assume you mean running parallel to the joist, right? I don't think running boards or bored holes apply here... if they're running perpendicular to the floor joist, then Jim Port is correct.
 
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