ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Childrens safety outlets
by dsk - 06/25/22 04:07 PM
AC-DC stage Ultra-Fast charger, how it's made?
by libellis - 06/25/22 12:17 PM
Your favourite food?
by NORCAL - 06/16/22 12:06 AM
Price action trading with RENKO
by gfretwell - 06/15/22 02:08 PM
Please Help Wiring DCDC Buck Converter
by gfretwell - 06/15/22 01:58 PM
New in the Gallery:
240/208 to a house
240/208 to a house
by wa2ise, October 9
Now you know.
Now you know.
by Tom_Horne, September 7
Who's Online Now
0 members (), 41 guests, and 10 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
#88643 07/02/04 08:41 AM
Joined: Mar 2003
Posts: 849
Y
Member
30 Hp with V.F.D.
430.6 & 430.150
30 hp =40amps at 460 volts
40x150%=60amps
wire size=3#6s &1#10
Disconnect Switch=60amp
Should disconnect switch be up sized to 100 amp (fuseable).Seems to be hitting it right on the mark? wondered if maybe to close??

75hp 460v 3 phase (96 amps)
96x150%=144 amps
wire size=3#1s&1#8
Disconnect switch =100amps

Hows it look guys don;t have into off name plates of VFD so using 430.6c

Stay up to Code with the Latest NEC:


2020 NEC & Related Reference & Study Guides
2020 NEC & Related Reference & Study Guides
Pass Your Exam the FIRST TIME with these Exam Prep Combos:
 

>> Master Electrician Exam Prep     >> JourneyMan Electrician Exam Prep
 

#88644 07/02/04 08:43 AM
Joined: Mar 2003
Posts: 849
Y
Member
Opps Disconnect switch 150 amps not 100 amps

#88645 07/02/04 09:41 AM
Joined: Jan 2003
Posts: 4,391
I
Moderator
Take a look at 430.2.

I do not see an option for using the tables as far as the VFD is concerned.

[This message has been edited by iwire (edited 07-02-2004).]


Bob Badger
Construction & Maintenance Electrician
Massachusetts
#88646 07/02/04 09:52 AM
Joined: Mar 2003
Posts: 849
Y
Member
430.6c
If the maximum operating current does not appear on the nameplate ,the ampacity determinated shall be based on 150% of the valves given in tables 430.149 and 430.150.

#88647 07/02/04 09:57 AM
Joined: Jan 2003
Posts: 4,391
I
Moderator
I do not see that 430.6(C) changes the requirments of 430.2


Bob Badger
Construction & Maintenance Electrician
Massachusetts

Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *

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

 

Member Spotlight
HCE727
HCE727
Delaware County, PA, USA
Posts: 187
Joined: November 2005
Top Posters(30 Days)
triple 3
grich 2
dobler 2
Asset 2
Popular Topics(Views)
293,084 Are you busy
225,069 Re: Forum
210,491 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5