ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Where is Everyone?
by gfretwell - 06/20/21 10:53 PM
Happy Father's Day!
by Bill Addiss - 06/19/21 04:16 PM
A Risky Setup
by timmp - 06/18/21 08:08 PM
Conduit over Vinyl Siding
by Jim M - 06/16/21 08:30 PM
Updated Forum Software
by Admin - 06/15/21 10:23 AM
New in the Gallery:
2020 - 2021 Winter Project
2020 - 2021 Winter Project
by Bill Addiss, April 29
Garden 2021
Garden 2021
by Bill Addiss, April 26
Who's Online Now
0 members (), 15 guests, and 17 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Joined: Dec 2003
Posts: 4
E
Erich Offline OP
Junior Member
Hello,

We (a german company)want to build up an inspection machine, based on 24VDC.
As a power supply we use a listed power supply 3x400VAC In -> 24VDC Out.
At the 24VDC output there are connected a UPS and a 24VDC power-supply for a PC.

Whats about the components on the secondary 24VDC side. Must they be UL-listet?

I have heard that component on secondary circuits must not be listed.
Are there exceptions?

2017 / 2014 NEC & Related Books and Study Guides
Joined: Sep 2002
Posts: 1,498
C
C-H Offline
Member
I think the simplest way of getting answers to your questions is to contact UL.

Some of the questions likely to arise can be answered by the tech info pages at B-I-A (Some in English, some only in German)
http://www.biagmbh.com/techinfo.htm

I would however like to point out that 3x400V input is a poor choice for use in North America. No such voltage is in use which would force the user to install a transformer for your equipment. For dual use Europe/North America I would suggest you consider using 220-240V single phase instead, as it is a voltage available in almost all countries of the world. (200-240V nominal covers the entire world.) If the power demand is too high to be suitable for this, I'm sure the Americans reading this can tell what is normally available in these locations. (Hospitals?)


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
The Watt Doctor
The Watt Doctor
Mont Belvieu, TX
Posts: 437
Joined: December 2001
Top Posters(30 Days)
Trumpy 10
Admin 10
Popular Topics(Views)
280,448 Are you busy
213,527 Re: Forum
200,406 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5