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Products => Test Equipment => Topic started by: mimmus78 on March 16, 2014, 09:51:56 am

Title: Unit-trend UT60A is UL listed ??? CATIV 600V CATIII 1000V with 250V glass fuses?
Post by: mimmus78 on March 16, 2014, 09:51:56 am
How is possible it passes UL Listing with 250V glass fuses?

*** UL List DATABASE HERE *** (http://database.ul.com/cgi-bin/XYV/template/LISEXT/1FRAME/showpage.html?name=PICQ.E226066&ccnshorttitle=Measuring,+Testing+and+Signal-generation+Equipment&objid=1075821977&cfgid=1073741824&version=versionless&parent_id=1073991173&sequence=1)
Title: Re: Unit-trend UT60A is UL listed ??? CATIV 600V CATIII 1000V with 250V glass fuses?
Post by: Wytnucls on March 16, 2014, 10:06:06 am
The new requirement for HRC fuses with a voltage rating equal to the highest CAT voltage rating is part of the latest published regulations (IEC61010 part 1).
Before that document release, fuses were not part of the regulations, apart from having to be certified by an independent body.
Title: Re: Unit-trend UT60A is UL listed ??? CATIV 600V CATIII 1000V with 250V glass fuses?
Post by: mimmus78 on March 16, 2014, 03:42:04 pm
They are glass fuses not HBC ... I read everywhere that the glass fuses are not good for any CAT III meter or I'm missing something?
Title: Re: Unit-trend UT60A is UL listed ??? CATIV 600V CATIII 1000V with 250V glass fuses?
Post by: Lightages on March 17, 2014, 03:13:22 am
As Wytnucls said, the older requirements had a loop hole that let manufacturers make a different voltage spec for different jacks and thus people slipped in cheap fuses and labelled the amp jacks with a lower soec than the rest of the meter. This practice has been disallowed in the current CAT rating requirements but obviously older designs and production runs still exist.
Title: Re: Unit-trend UT60A is UL listed ??? CATIV 600V CATIII 1000V with 250V glass fuses?
Post by: saturation on March 17, 2014, 11:59:14 am
Worth reviewing lightages good work:

https://www.eevblog.com/forum/testgear/a-list-of-multimeters-that-do-not-appear-to-meet-their-claimed-safety-specs/msg157700/#msg157700 (https://www.eevblog.com/forum/testgear/a-list-of-multimeters-that-do-not-appear-to-meet-their-claimed-safety-specs/msg157700/#msg157700)

Title: Re: Unit-trend UT60A is UL listed ??? CATIV 600V CATIII 1000V with 250V glass fuses?
Post by: Neilm on March 17, 2014, 08:37:47 pm
Quote from: Lightages on March 17, 2014, 03:13:22 am
This practice has been disallowed in the current CAT rating requirements but obviously older designs and production runs still exist.

I believe that the edition 2 standard was withdrawn last year - meaning any device on the market in the EU carrying the CE mark should comply to the new standard. If it doesn't, then it is a matter for the local enforcement authority.