ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat Box
Recent Posts
Lock-down Thread
by Bill Addiss - 02/27/21 01:16 PM
Northern Tool Recalls Powerhorse Generators
by Admin - 02/25/21 09:49 PM
You will never guess
by gfretwell - 02/25/21 07:48 PM
New tool
by SMOKEYBOB - 02/15/21 04:59 PM
New in the Gallery:
Facebook follies, bad wiring
FPE in Germany pt.2
Who's Online Now
0 registered members (), 14 guests, and 19 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
5% rule. #178705 06/09/08 09:17 PM
Joined: Dec 2001
Posts: 444
S
Sandro Offline OP
Member
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:
Re: 5% rule. [Re: Sandro] #178706 06/09/08 10:22 PM
Joined: Mar 2004
Posts: 947
T
twh Offline
Member
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.

Re: 5% rule. [Re: twh] #178920 06/15/08 09:32 PM
Joined: Apr 2003
Posts: 13
T
ThorahSparky Offline
Junior Member
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.


Featured:

2020 National Electrical Code
2020 National Electrical
Code (NEC)

* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
AllClear
AllClear
Belmond Iowa US
Posts: 44
Joined: August 2005
Show All Member Profiles 
Top Posters(30 Days)
MCosta 3
Popular Topics(Views)
275,453 Are you busy
209,361 Re: Forum
196,636 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.3