Anudder service calculation question? - Electrician Talk - Professional Electrical Contractors Forum
Go Back   Electrician Talk - Professional Electrical Contractors Forum > Electrical Forum > General Electrical Discussion

Thread Tools Display Modes
Old 04-10-2007, 12:29 AM   #1
Join Date: Apr 2007
Posts: 6
Rewards Points: 10
Default Anudder service calculation question?

I once wired a 2 story house that had 3 seperate Heat & Air units. The heaters were all gas, so 20amp/120v circuit only to them. But two a/c units required 30 amp/240v circuits and one a/c unit required a 40 amp/240v circuit.

So when calulating the service load would you use only 100 percent of the largest a/c unit, or 100 percent of all 3 a/c units, or 100 percent of average of all 3 added together? Or just how would this be placed in your calculation table for finding the service load?

Thanks for your input. Still studying for that masters/contractors exam!
agoolay is offline   Reply With Quote
Join Contractor Talk

Join the #1 Electrician Forum Today - It's Totally Free! - Are you a Professional Electrical Contractor? If so we invite you to join our community and see what it has to offer. Our site is specifically designed for you and it's the leading place for electricians to meet online. No homeowners asking DIY questions. Just fellow tradesmen who enjoy talking about their business, their trade, and anything else that comes up. No matter what your specialty is you'll find that is a great community to join. Best of all it's totally free!

Join - Click Here JOIN FOR FREE

Warning: The topics covered on this site include activities in which there exists the potential for serious injury or death. DOES NOT guarantee the accuracy or completeness of any information contained on this site. Always use proper safety precaution and reference reliable outside sources before attempting any construction or remodeling task!

Sponsored Links
Old 04-18-2007, 04:44 PM   #2
NEC Educator & Consultant
TheElectricalGuru's Avatar
Join Date: Jan 2007
Location: Harrisonburg,Va
Posts: 66
Rewards Points: 75


Also check out 220.30 (C) for the percentages for other than Air-Conditioning and Heat Pump and Supplemental Heating....

Hope this helps.... make it easy on is a nice download for you from my site

It has been edited to be based on the 2005 NEC.......ENJOY !
Paul W. Abernathy,CME,RMS,CMI
Master Electrician/Electrical Educator/NEC Consultant
ICC & IAEI Certified Electrical Inspector/Plans Examiner

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
TheElectricalGuru is offline   Reply With Quote

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
Service line question... Todd-sta General Electrical Discussion 4 11-08-2008 01:11 PM
150 amp residential service question BuzzKill General Electrical Discussion 2 10-27-2008 08:30 PM
current calculation barkmen General Electrical Discussion 1 08-23-2008 11:12 PM
UF-B load calculation crash63 General Electrical Discussion 1 04-23-2008 08:18 PM
Residential Service Question tahoewire Services and Service Equipment 8 01-13-2008 10:49 AM

All times are GMT -4. The time now is 02:37 PM.

Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.1
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
User Alert System provided by Advanced User Tagging (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Our Pro Sites Network | | | | |