ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
AreMetal Ladders Ever OK For Electrical Work?
by HotLine1. 01/22/18 07:31 PM
Photocell
by twh. 01/22/18 05:06 PM
VDE 0100 to introduce AFCIs
by sparky. 01/20/18 05:09 PM
MRI LED lights dimmer control replacement - wow!
by Potseal. 01/19/18 08:52 PM
New in the Gallery:
Housebilding DIY wiring
SE cable question
Who's Online Now
0 registered members (), 14 guests, and 10 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Using not Listed Equipment at 24VDC #87347
02/17/04 06:12 AM
02/17/04 06:12 AM
E
Erich  Offline OP
Junior Member
Joined: Dec 2003
Posts: 4
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
Re: Using not Listed Equipment at 24VDC #87348
02/17/04 08:16 AM
02/17/04 08:16 AM
C
C-H  Offline
Member
Joined: Sep 2002
Posts: 1,497
Stockholm, Sweden
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?)


Featured:

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

 

Member Spotlight
Scott35
Scott35
Anaheim, CA. USA
Posts: 2,708
Joined: October 2000
Show All Member Profiles 
Top Posters(30 Days)
Admin 20
sparky 15
Popular Topics(Views)
243,606 Are you busy
180,422 Re: Forum
170,875 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.011s Queries: 14 (0.003s) Memory: 0.9417 MB (Peak: 1.0571 MB) Zlib enabled. Server Time: 2018-01-24 07:43:57 UTC