ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
Recent Posts
Question on power to 4 Nema 6-50 & 5 Nema 5-15.
by TrickedoutTech. 10/22/17 11:36 PM
VFD MotorFeeders
by Yoopersup. 10/22/17 07:52 PM
Generator Cable Sizing
by brsele. 10/18/17 07:39 PM
What do you do?
by gfretwell. 10/17/17 01:08 AM
Good ol' copper pipe in the fuse holder trick
by HotLine1. 10/16/17 07:16 PM
New in the Gallery:
Gallery Test
Popular Topics(Views)
241,458 Are you busy
177,448 Re: Forum
169,026 Need opinion
Who's Online Now
1 registered members (Admin), 23 guests, and 13 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#204272 - 11/25/11 03:03 PM Automating Manual Gen Transfer Swtich...  
johnmixdecn  Offline
New Member
Joined: Nov 2011
Posts: 1
NY
Hi all. I have a setup with a diesel genset. This genset feeds a 3 phase panel (120/120/120). This panel has 4 double breakers, each feed a single phase panel, each of which has a manual transfer switch that switchs the panel between line power and the 3 phase gen panel. This has worked well for years.

What im looking to do is to automate this. Installing 3 auto transfer switchs is beyond my budget.

What im thinking is I will write a program that runs on a dedicated PC (on battery backup of course) that will watch the incoming power, and when we lose power, or a even lose a single phase...it will start and warm up the genset. Then it will wait a few minutes then flip each transfer switch over. I have writen a similar program for a smaller application that was in a communications shed in the woods. It worked great.

This is where my question comes in. Would it violate code in any way to have an electric actuator push/pull the handle of the transfer switchs from "Line" to "Gen"? I cant see how it would since this is external from any electrics and is doing this same thing as a human fliping the switch.

--John


Work Gear for Electricians and the Trades

#204273 - 11/25/11 04:20 PM Re: Automating Manual Gen Transfer Swtich... [Re: johnmixdecn]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,124
Estero,Fl,usa
When you change a manual transfer switch to automatic (any way you do it) you do bring in the requirement that the generator now must be capable of maintaining the entire connected load.
Does your program do load management?
Other than that you might bump into 110.3(B) about using equipment the way the manufacturer's instructions specify.



Greg Fretwell


Member Spotlight
BEAMEUP
BEAMEUP
WA
Posts: 27
Joined: December 2004
Show All Member Profiles 
Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.013s Queries: 15 (0.003s) Memory: 0.7443 MB (Peak: 0.8595 MB) Zlib enabled. Server Time: 2017-10-23 13:14:40 UTC