COMMUNITY FORUM

edight

12:25PM | 01/08/03
Member Since: 01/05/03
5 lifetime posts
Bvelectrical
I'm having trouble understanding a section of the NEC. It's the part that states that non-metallic cables bundled together for more than 24" need to be downrated. I don't want to downrate the cables but I also I want to drill the minimum number of holes in my studs that is necessary for running several cables in a wall. Does anyone know how far apart the cables need to be before they're not considered bundled? I would like to run three cables through each hole and then somehow separate them the required distance between studs.

Thanks in advance!
-eric

Tom O

11:27AM | 01/09/03
Member Since: 09/17/02
477 lifetime posts
You will not have to worry about derating 3 cables if they are bundled, provided that you are dealing with single phase power (what almost all homes have).

Three each two wire cables results in 6 current carrying conductors and their ampacity is still 20 amps or more.

Three each 3 wire cables, run as multi-wire circuits still only have 6 current carrying conductors You don't count the neutrals in this case, but even if you did, the final ampacity is still 20 amps or more.

None of this takes temperature into account.

Tom

edight

08:00AM | 01/10/03
Member Since: 01/05/03
5 lifetime posts
Ah, I see now. I'm slowly figuring this out. Thanks for all the info, Tom. I'll keep in mind that I still need to consider temp and voltage drop.

So it looks like I'll be able to bundle four cables (8 current carrying conductors) together and still be above the max ampacities for 14AWG and 12AWG (what I'm using). But I'll still have 2 bundles of four that will need to run parallel for more than 2 feet. How far apart should these two bundles be?

Click_to_reply_button
Inspiration_banner

INSPIRATION GALLERY



Post a reply as Anonymous

Photo must be in JPG, GIF or PNG format and less than 5MB.

Reply_choose_button

captcha
type the code from the image

Anonymous

Post_new_button or Login_button
Register

This thin bamboo panel, which appears to float in midair, lets dappled sunlight pass through to the seating area below. Th... Reused steel windows create an eye-catching splashguard in this walk-in shower. The vintage factory windows bring an inter... A galvanized steel tub is a surprising but charming fixture in this bright and breezy screened patio. It's perfect for was... If you're not crazy about the idea of commingling plants and pool, this modern variation may be more to your liking. The s... Yes, a freestanding garage can become its own tiny house. Artist Michelle de la Vega has all the comforts of a modern resi... If you lack plumbing skills but have a good sturdy tree, here's the easiest outdoor shower solution of all: Simply attach... Pursue what's known as the stack effect. To achieve it, open the windows on both the upper and lower floors, and as warm a... How do you like this smart use for an old bottle? Clamp an empty wine bottle to a fence or wall near your outdoor deck or ... Simple and striking, a couple of pieces of "lovingly used" furniture creates a special kind of charm. A weathered chair fo... Twine lanterns add pops of crafty—but sophisticated—flair to any outdoor setting. Wrap glue-soaked twine around a balloon ... When securely fastened to a tree or the ceiling of a porch, a pallet and some cushioning make the ideal place to lounge. V... Incorporate nature into your lighting scheme by securing a dead tree in a concrete mold and draping your pendant lamp from... For the cost of a can of exterior paint , you can totally transform your porch. Paint the floor a hue that complements yo... In this urban apartment, a standard-issue patio became a serene and green perch by replacing the typical concrete with gro... This garden shed has been decked out to the nines. Designer Orla Kiely created the intimate home for a flower trade show, ...
Follow_banner_a
Newsletter_icon Google_plus Facebook Twitter Pinterest Youtube Rss_icon
 
webapp1