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Forum section: electronics / general

author: GEuser
author_rank: Frequent Contributor
timestamp: December 04, 2014, 07:24:17 am
content: Q

author: Paul Moir
author_rank: Frequent Contributor
timestamp: December 04, 2014, 08:17:03 am
content: Haha!I love my old pre-CAT Micronta 22-174B which will happily tell you that 1000v at whatever amps is fine through some *maybe* 30ga wires with about 1mm of insulation on them. That said when I go probe the mains after the fuse panel, where probably several thousand amps are available to cook me into something an American might eat, I'll grab my Fluke 175 thank you very much.Contrary point though: "Freedom's just another word for nothing left to loose."PS - I rely on my neighbours to use MOVs.

author: SteveyG
author_rank: Unknown
timestamp: December 04, 2014, 02:20:58 pm
content: Flukes are generally designed for industrial use.

author: Lightages
author_rank: Unknown
timestamp: December 04, 2014, 03:20:23 pm
content: I am not sure about the point of the OP, but I can say that I have zero data on the deaths and injuries suffered. I have seen many electricians missing parts of fingers and hands, and many scared faces from electrical flash arcs. They were all from industrial settings so it does not apply to household injuries.MOVs paralleled in a house might make an effective clamp for some surges but that is relying on something unknown.Sure, probably hundreds of thousands of people get away with unsafe meters for every one person who does not get away with it. Perhaps the injury rate is lower than just crossing the road. So? A well built meter is also going to be a reliable meter. If a company lies about its safety ratings, as is the case for many cheap meters, what else are the lying about?Damn, I was just about to write that I am not a "Fluke upper-class wanker" and just remembered that I do have a Fluke

author: Shock
author_rank: Super Contributor
timestamp: December 04, 2014, 03:39:38 pm
content: Cat rating whine.

author: SeanB
author_rank: Super Contributor
timestamp: December 04, 2014, 03:54:06 pm
content: Let me see, about 6 sets of MOV's across the mains in various pieces of equipment, though I need to install a few more to add the extra protection. Still have 16 in a bag to just use in a plugtop and have extra distributed overvoltage protection. A few smaller units are better than a large single one ( though you do get some truly massive ones for 240V mains use) as they at least are cheaper to replace when they do fail.

author: Yago
author_rank: Frequent Contributor
timestamp: December 04, 2014, 06:51:49 pm
content: Thought that the inductance of the conduction path is key to the cat ratings.IE lots of cable run to your test point reduces transient, and lots of cable between the movs and test meter lessens their(movs) effect at dissipating transient.

author: Wytnucls
author_rank: Super Contributor
timestamp: December 04, 2014, 07:19:54 pm
content: http://www.leviton.com/OA_HTML/ibcGetAttachment.jsp?cItemId=23311&label=IBE&appName=IBE

author: SeanB
author_rank: Super Contributor
timestamp: December 04, 2014, 07:38:24 pm
content: Thanks, useful info. I have had a few MOV devices fail over the years as short circuit, which is a good thing as a protection. The last one went out quite violently, though this was contained by the outer resin casing of the plugtop.

author: Lightages
author_rank: Unknown
timestamp: December 05, 2014, 02:26:43 pm
content: Wow, talk about bad information. I always am amazed at how many information videos from experts or businesses have things wrong.

author: Monkeh
author_rank: Super Contributor
timestamp: December 05, 2014, 03:39:11 pm
content: Just how much do you drink before making these posts, anyway?

author: Lightages
author_rank: Unknown
timestamp: December 06, 2014, 02:54:51 am
content: Who? Why?

author: Monkeh
author_rank: Super Contributor
timestamp: December 06, 2014, 02:55:56 am
content: Quote from: Lightages on December 06, 2014, 02:54:51 amSorry, not you, the OP.