[PSES] Meaning of opposite polarity in IEC 61010-1 Ed. 3

2012-09-27 Thread Nic Johnson
Edition 3 of IEC 61010-1 added the following line to Section 9.6.1; A minimum of BASIC INSULATION is required between MAINS-connected parts of opposite polarity on the supply side of the overcurrent protection device. Does anyone know what opposite polarity is supposed to mean in this context?

Re: [PSES] Meaning of opposite polarity in IEC 61010-1 Ed. 3

2012-09-27 Thread Brian Oconnell
Line to neutral for mains-connected Class I equipment. Line to line for 3-phase equipment. There are additional requirments for Class II equipment. In Texas, opposite polarity represents the different sections serving beer and wine. Brian -Original Message- From: emc-p...@ieee.org

Re: [PSES] Meaning of opposite polarity in IEC 61010-1 Ed. 3

2012-09-27 Thread Richard Nute
Hi Nic: Opposite polarity is a term I first came across in UL standards. As you have, I understood polarity applied to D.C. UL applied the term to A.C., meaning the opposite (or return) pole of the supply. Here's a definition of polarity from the net: polarity (p??'lær?t?) - n 1. the

[PSES] Calling all old-timers

2012-09-27 Thread Ken Javor
Make that older-timers. Just purchased an Empire Devices AT-58 6 dB attenuator. It's big - looks like it ought to handle 100 Watts, but there is no indication of the power handling capability. Input and output are marked, and only the input side is supposed to face the high power source, so the

Re: [PSES] Calling all old-timers

2012-09-27 Thread Don_Borowski
While the schematic may be a pi or T network, internally it may be a series of pi or T networks, each section of which dissipates a given amount of wattage. This means the input pi/T might attenuate say only a few tenths of a dB, while the last pi/T also dissipates about the same amount of

Re: [PSES] Calling all old-timers

2012-09-27 Thread Derek Walton
Perhaps. To help isolation It has several sections. Only the output end has lower power parts Derek Sent from my iPhone On Sep 27, 2012, at 6:12 PM, don_borow...@selinc.com wrote: While the schematic may be a pi or T network, internally it may be a series of pi or T networks, each

Re: [PSES] Calling all old-timers

2012-09-27 Thread Ken Javor
I may have posed my question unclearly. What is the power handling capability of an Empire Devices AT-58 6 dB attenuator, properly inserted in a circuit? The balance of the discussion was just there to pique any old memories. Ken Javor Phone: (256) 650-5261 From: Derek Walton

Re: [PSES] Calling all old-timers

2012-09-27 Thread Ted Eckert
Here is a specification sheet for the Empire Devices AT-60. I can't state whether it would have similar ratings to the AT-58, but it may provide some guidance. http://www.aef.se/Mat-Testteknik/Typkatalog/M2433/M2433-103010.pdf Ted Eckert Compliance Engineer Microsoft Corporation