Question About Sub Panel - Electrical - DIY Chatroom Home Improvement Forum


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Electrical

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Display Modes
Old 07-28-2011, 10:12 PM   #1
Newbie
 
Join Date: Jul 2011
Posts: 5
Rewards Points: 10
Default

Question about sub panel


Hi, I need help figuring out what size breaker and cable to run to a sub panel.

The sub panel will feed two 1000 watt light fixtures wired at 220 ,
i will need another 20 amp breaker for another light, and then about 10 outlets for some fans and stuff, so i need to know what size breaker for my main panel, and what size cable to run to the sub panel? I imagine i would just want to run 100 amp with 2/3 but i wanted to make sure .

Ryan

Advertisement

lilryry is offline   Reply With Quote
Old 07-28-2011, 10:15 PM   #2
Electrical Contractor
 
kbsparky's Avatar
 
Join Date: Sep 2008
Location: Delmarva
Posts: 3,368
Rewards Points: 2,000
Default

Question about sub panel


Overkill, big time.

Advertisement

__________________
-KB

Life is uncertain -- eat dessert first!!
kbsparky is offline   Reply With Quote
Old 07-28-2011, 10:16 PM   #3
Newbie
 
Join Date: Jul 2011
Posts: 5
Rewards Points: 10
Default

Question about sub panel


well thats why i am posting because i dont know what to use. I do want to make sure its safe.

Ryan
lilryry is offline   Reply With Quote
Old 07-28-2011, 10:20 PM   #4
Newbie
 
Join Date: Jul 2011
Posts: 5
Rewards Points: 10
Default

Question about sub panel


i think each 1000watt light needs its own 30 amp right? so thats 60 righty there, then i have one more big light that needs a 20 thats 80, and then the outlets for the fans and stuff. thats why i said 100
lilryry is offline   Reply With Quote
Old 07-28-2011, 10:26 PM   #5
Licensed electrician
 
Join Date: Sep 2007
Location: Maryland
Posts: 8,002
Rewards Points: 2,802
Default

Question about sub panel


The 1000W lights at 240 volts are less than 5 amps each.
__________________
Answers based on the National Electrical Code. Local amendments may apply. Check with your local building officials.
Jim Port is online now   Reply With Quote
Old 07-28-2011, 10:40 PM   #6
I=E/R
 
a7ecorsair's Avatar
 
Join Date: May 2010
Location: Minnesota
Posts: 2,052
Rewards Points: 1,000
Default

Question about sub panel


Quote:
Originally Posted by lilryry View Post
i think each 1000watt light needs its own 30 amp right? so thats 60 righty there, then i have one more big light that needs a 20 thats 80, and then the outlets for the fans and stuff. thats why i said 100
You are doing the math wrong.
Unless you have plans for a lot more load, like a shop with power tools, a 60 amp sub will have plenty of capacity with room to spare.
a7ecorsair is offline   Reply With Quote
Old 07-28-2011, 11:46 PM   #7
Member
 
Join Date: Sep 2008
Location: SoCal
Posts: 1,794
Rewards Points: 1,000
Default

Question about sub panel


A 100 amp subpanel fed via a 60 amp breaker is a common setup for a shop or similar - usually ample power, room for expansion, and cost effective to implement.
__________________
____________
Vince
vsheetz is offline   Reply With Quote
Old 07-29-2011, 10:33 AM   #8
Newbie
 
Join Date: Jul 2011
Posts: 2
Rewards Points: 10
Default

Question about sub panel


Quote:
Originally Posted by lilryry View Post
Hi, I need help figuring out what size breaker and cable to run to a sub panel.

The sub panel will feed two 1000 watt light fixtures wired at 220 ,
i will need another 20 amp breaker for another light, and then about 10 outlets for some fans and stuff, so i need to know what size breaker for my main panel, and what size cable to run to the sub panel? I imagine i would just want to run 100 amp with 2/3 but i wanted to make sure .

Ryan

Sounds like someone is building a grow house...hopefully nothing illegal is being planted ???
acer is offline   Reply With Quote
Old 07-29-2011, 11:03 AM   #9
Newbie
 
Join Date: Jul 2011
Posts: 5
Rewards Points: 10
Default

Question about sub panel


what size cable do i need from the main panel to the sub panel?
lilryry is offline   Reply With Quote
Old 07-29-2011, 11:22 AM   #10
Newbie
 
Join Date: Jul 2011
Posts: 2
Rewards Points: 10
Default

Question about sub panel


It depends on how far away the sub panel is from the main.
acer is offline   Reply With Quote
Old 07-29-2011, 12:04 PM   #11
Newbie
 
Join Date: Jul 2011
Posts: 5
Rewards Points: 10
Default

Question about sub panel


its only about 15 feet from the main panel
lilryry is offline   Reply With Quote
Old 07-29-2011, 12:30 PM   #12
Lic Electrical Inspector
 
electures's Avatar
 
Join Date: Dec 2009
Location: The Great Police State of New Jersey
Posts: 1,759
Rewards Points: 1,102
Default

Question about sub panel


Quote:
Originally Posted by lilryry
what size cable do i need from the main panel to the sub panel?
What size breaker?
__________________
All responses based on the 2011 NEC.
If you live in New Jersey click here. All other states click here.
Please check with local, county and state officials as laws may vary.
Sizing motors here. Online motor calculator here. Online calculators here.
electures is offline   Reply With Quote
Old 07-29-2011, 12:32 PM   #13
Electrical Contractor
 
jbfan's Avatar
 
Join Date: Jun 2004
Location: Newnan GA
Posts: 5,959
Rewards Points: 2,314
Default

Question about sub panel


6/3 with a ground!

Advertisement

__________________
Yes I am a Pirate, 200 years too late. "Jimmy Buffett"
jbfan is online now   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Old House Rewire finnimus Electrical 15 05-13-2011 11:39 PM
Electric panel enclosure question globus999 Electrical 6 11-23-2010 10:30 PM
Panel History (old Breaker Panel Question) jamiedolan Electrical 3 01-17-2009 04:27 PM
Replacement Meter Panel leonard_voet Electrical 19 04-09-2008 11:27 AM
Installing new (service?) breaker panel and generator panel Nhrafan Electrical 6 04-01-2008 04:03 PM




Top of Page | View New Posts