ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Al Hildenbrand - Minneapolis - obituary
by Bill Addiss - 02/03/23 07:38 PM
Violation?
by renosteinke - 01/27/23 09:52 PM
Does NEC 551.71 (F) apply to dwellings?
by BigB - 01/20/23 10:46 AM
Power submeter connections
by HotLine1 - 01/19/23 09:09 AM
New in the Gallery:
Burger King crown sillyness
Burger King crown sillyness
by wa2ise, December 11
240/208 to a house
240/208 to a house
by wa2ise, October 9
Who's Online Now
0 members (), 23 guests, and 13 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
#98728 03/08/05 02:27 PM
Joined: Oct 2000
Posts: 2,749
Member
Impedance Pipeline Heating Systems

HELP!

What is the GFP required here in Section 427.27, Exception?

I know it is not a GFCI. but I cannot find it in the UL Directory.

It is a Ground Fault Protection of Equipment.

First one who calls me within the next 1/2 hour will win a prize!

617-818-7627


Joe Tedesco, NEC Consultant
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
 

Joined: May 2004
Posts: 162
C
Member
427.27 Voltage Limitations.
Unless protected by ground-fault circuit-interrupter protection for personnel, the secondary winding of the isolation transformer connected to the pipeline or vessel being heated shall not have an output voltage greater than 30 volts ac.
A new exception has been added for industrial locations. These units are manufactured as a system and in some cases heat fluid within pipes up to 6 miles long. This is accomplished by regulating currents upwards of 3000 ampere through these vessels. The conductive piping exchanges heat via the I2 R losses and this method is less than others. The transformers are 120/208V and the + - taps are set at 10%, thus the need to increase the output voltage to 132V. Exception: In industrial establishments, the isolation transformer connected to the pipeline or vessel being heated shall be permitted to have an output voltage not greater than 132 volts ac to ground where all of the following conditions apply:

Joined: Oct 2000
Posts: 2,749
Member
Thanks, this is the part in the Exception that I want to find out more about.

Quote
(2) Ground fault protection of equipment is provided.

I am looking for this type of protection as described in the UL White book.

When I posted the question, I was discussing this at a class in Pittsburgh, I thought I would see if someone would actually call me with that information.

Charlie you won a beer on me some time in the future.


Joe Tedesco, NEC Consultant

Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *
2023 National Electrical Code (NEC)
2023 NEC Now Available!
 
* * * * * * *

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

 

Member Spotlight
Radar
Radar
Los Angeles
Posts: 349
Joined: April 2004
Top Posters(30 Days)
BigB 4
triple 3
Popular Topics(Views)
303,132 Are you busy
232,155 Re: Forum
216,884 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5