ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
dsk 3
Recent Posts
weatherproof fan box
by sparkync. 06/28/17 02:18 PM
High Leg Delta, phase angles
by gfretwell. 06/27/17 12:17 PM
Mains supply in GDR
by Texas_Ranger. 06/27/17 07:44 AM
Feed to spa panel
by HotLine1. 06/25/17 05:28 PM
Weatherhead, POA, height?
by HotLine1. 06/24/17 02:37 PM
New in the Gallery:
SE cable question
Popular Topics(Views)
238,291 Are you busy
173,502 Re: Forum
166,304 Need opinion
Who's Online Now
0 registered members (), 47 guests, and 8 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#178705 - 06/09/08 10:17 PM 5% rule.  
Sandro  Offline
Member
Joined: Dec 2001
Posts: 444
Stoney Creek, ON, Canada
300 mcm T90Nylon is rated for 295amps. Using the 5% rule, one could use parallel 300mcm runs for a 600 amp service?


Tools for Electricians:

#178706 - 06/09/08 11:22 PM Re: 5% rule. [Re: Sandro]  
twh  Offline
Member
Joined: Mar 2004
Posts: 915
Regina, Sask.
If your calculated demand is 620 amps, you can put in a 590 amp service, which would be fused at 600 amps according to 14-104, if a 590 amp fuse is not available. That is, you can install a 590 amp service and fuse it at 600 amps.


#178920 - 06/15/08 10:32 PM Re: 5% rule. [Re: twh]  
ThorahSparky  Offline
Junior Member
Joined: Apr 2003
Posts: 13
Orillia,ON,Canada
Generally if you are considering applying the 5% rule I would first run it by your local inspector. Yes, it is a rule but doing so makes for a better relationship, especially if you don't know him/her.



Member Spotlight
Trumpy
Trumpy
SI,New Zealand
Posts: 8,214
Joined: July 2002
Show All Member Profiles 
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.011s Queries: 15 (0.003s) Memory: 0.7505 MB (Peak: 0.8754 MB) Zlib enabled. Server Time: 2017-06-29 00:21:02 UTC