RE: Sometimes product safety just isn't enough

Ever since I saw this, I have been wondering what's going on in the mind of this guy: - doesn't have a clue - can probably get away with this - my tools are in good shape, everything's OK Bob Johnson ITE Safety -Original Message- From:

RE: Three phase delta system in USA

There are many such local services in the US. The only services you can dependably expect are the 120/240 (center tapped) residential service 120Y208 three phase business/commercial service 277Y480 three phase light industrial service There are many other conventions based on peculiar industries,

RE: What happened to the IEC60417 symbol library?

Its now available from IEC (at a price - copyrighted you know): IEC 60617 Graphical Symbols database The IEC 60617 Graphical Symbols for Diagrams database (http://domino.iec.ch/symbols) has now been launched officially. The database offers users a dynamic facility featuring some 1 400 symbols

RE: Production Line Hipot Test for Network Powered Equipment

Those removable links can be fuses, which are a good idea to use with sidactors or MOVs anyway. Bob -Original Message- From: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org] On Behalf Of John Woodgate Sent: Wednesday, November 28, 2001 2:28 AM To:

RE: Define Continuous DC Voltage - defibrillation

: Bill Owsley [mailto:ows...@cisco.com] Sent: Tuesday, November 20, 2001 12:53 PM To: robertj; 'Bill Owsley'; 'Gary McInturff'; 'Gregg Kervill'; 'Rich Nute' Cc: jrbar...@lexmark.com; emc-p...@majordomo.ieee.org Subject: RE: Define Continuous DC Voltage - defibrillation excellent - now if you'll go

RE: Define Continuous DC Voltage - defibrillation

I also have not encountered the theory about chest compression controlling fibrillation. Since defibrillation is also controlled during open heart surgery by paddles directly applied to the heart and through the use of wire catheters from implantable defibrillators, it is not the only means. I

FW: AW: Define Continuous DC Voltage

Keep in mind that failure of the earthing can also be an undetected fault. The intent is to provide two levels of protection, two layers of insulation or one layer of insulation plus earthing. In each case, failure of one level may go undetected until failure of the second produces a hazard.

RE: Grounding Continuity Testers for UL 60950

Note that such a tester may be unnecessary. Note that 2.6.3.3 requires testing only for PROTECTIVE BONDING CONDUCTORS that do not comply with the minimum sizes in table 3B and for protective bonding terminals that do not comply with table 3E. You are unlikely to find a tester of this size on the

RE: Define Continuous DC Voltage

Obviously if you can define your voltage as DC, you can get away with a much higher level (60 V) as SELV than if it is not (42.4 V peak). The reasons for the different levels are the shock potential. A varying voltage has a much greater potential to cause ventricular fibrillation than a DC

RE: IEEE isolation question.

A few comments in addition to the consideration of ground loops well addressed by David Sterner. These wires are subject to the electrical codes as well as the product standards. The risk of contact with hazardous voltages is considered to be unlikely unless run outdoors, in which case protectors

RE: FDA

Elaborating a bit, both agencies deal with electromagnetic radiation, which is where some confusion arises. The Food and Drug Administration deals with the health aspects of products. As a result they worry about X-radiation from vacuum tubes and CRTs, diagnostic and therapeutic X-ray

RE: skinny power cords.

This subject of reliance on branch circuit protection for loads has been discussed for a long time and involves a lot of historical tradition and code and standards activities. The following is my understanding based on some code committee activities, but I have not researched this historically.