Re: [PSES] Measurement Accuracy

It might be worth mentioning the text from one of the safety standard as below : If, when carrying out a conformity test, there is any uncertainty about the exact value of an applied or measured quantity (for example, voltage) due to the tolerance: a) the manufacturer should ensure that at least

Re: [PSES] ELECTRIC SHOCK AS IT PERTAINS TO THE ELECTRIC FENCE

Hi Pete: Are the non-copyrighted papers (such as the UL “Bulletins of Research”) in the TC64/WG4 library available for public distribution? Rich From: Pete Perkins [mailto:0061f3f32d0c-dmarc-requ...@ieee.org] Sent: Wednesday, September 21, 2016 2:29 PM To:

Re: [PSES] ELECTRIC SHOCK AS IT PERTAINS TO THE ELECTRIC FENCE

Likely yes but that requirement was probably grandfathered for the pool built in 1979. Regular inspections are required of public pools in NC but electrical inspection is not required (except for new permits.) We’ll see if any change for legacy pools comes of this. -Dave From: Ed Price

Re: [PSES] ELECTRIC SHOCK AS IT PERTAINS TO THE ELECTRIC FENCE

It would appear that the real problem was lack of a GFCI breaker on the motor circuit, which would have tripped open when the current in/out ratio became unbalanced. Ed Price WB6WSN Chula Vista, CA USA From: Nyffenegger, Dave [mailto:dave.nyffeneg...@bhemail.com] Sent: Wednesday,

Re: [PSES] ELECTRIC SHOCK AS IT PERTAINS TO THE ELECTRIC FENCE

Well here’s one recent electric shock effect, the cause of which may be more interesting to understand than the resulting death. http://www.newsobserver.com/news/state/north-carolina/article101748857.html Tragic death of a lifeguard getting electrocuted while reaching into the pool and then

Re: [PSES] standard for power suply for server room.

All, 600 V is standard in Canada. -- Doug Nix d...@mac.com http://www.dougnix.net If you pick up a starving dog and make him prosperous, he will not bite you; that is the principal difference between a dog and a man. - Mark Twain > On 21-Sep-16, at 15:52, Richard Nute

Re: [PSES] ELECTRIC SHOCK AS IT PERTAINS TO THE ELECTRIC FENCE

Doug, et al, This fine early work is the foundation for later workers such as Dalziel, etc. which provides the basis for understanding electric shock effects. Note that you can only download the whole, very clear copy if your organization has a membership in the digital

Re: [PSES] ELECTRIC SHOCK AS IT PERTAINS TO THE ELECTRIC FENCE

You can view a good quality copy of this seminal work online at https://babel.hathitrust.org/cgi/pt?id=uc1.$b661851;view=1up;seq=3 -- Doug Nix d...@mac.com (519) 729-5704 Be who you are and say what you feel, because those

Re: [PSES] ELECTRIC SHOCK AS IT PERTAINS TO THE ELECTRIC FENCE

Hi Doug: Thanks! Any other Bulletins of Research sources? Any topic. Rich From: Douglas Nix [mailto:d...@mac.com] Sent: Wednesday, September 21, 2016 12:32 PM To: Rich Nute Cc: IEEE EMC PSTC Subject: Re: [PSES] ELECTRIC SHOCK AS

Re: [PSES] standard for power suply for server room.

Rich & friends Whilst I generally agree with what you said, if the customer already knows the system to which he needs connections, then it is only reasonable to ask him to clarify what his requirements and constraints are! I would also point out that other factors like altitude also

Re: [PSES] standard for power suply for server room.

I would seriously consider pointing out to your customer that their specified supply voltage is not a common one I suspect your customer already knows this. The issue is determining that the product is safe, given that the mains ratings exceed those in many safety standards. While

[PSES] ELECTRIC SHOCK AS IT PERTAINS TO THE ELECTRIC FENCE

Underwriters Laboratories did basic research in the field of safety and published the results of that research in a series of "Bulletins of Research." At least 58 bulletins were published relating to fire, explosion, and electric shock. One of those Bulletins, "Electric Shock as it Pertains to

Re: [PSES] Measurement Accuracy

On 9/21/2016 1:34 PM, Brian O'Connell wrote: For EMC - it is all magic and hand-waving Given reasonably well calibrated test equipment, for EMC it's "whose lab and how different they set up the test". The magic is coming within 6 dB of each other. Cortland Richmond -

Re: [PSES] Measurement Accuracy

Incorrect for product safety, there would be no 'gray area'. Per the error band, the temperature measurement exceeds limits. It is important to not confuse the 'accuracy method' in Guide 115 with the calculated UoM. Limits per instrument accuracy are only part of measurement uncertainty, and in

Re: [PSES] Measurement Accuracy

I’ll add that in some cases the uncertainty may not lead to a pass/fail decision rather just a another data point to be considered with other measurements/calculations. For example with the acoustics standards ISO 7574-1,2,3,4, ISO 3740, ISO 3744, ISO 3746. -Dave From: Balmukund Vyas

Re: [PSES] standard for power suply for server room.

Disclaimer: I don't work on data center equipment. Article 645 from the 2014 NEC includes the 600V rating limit in the definition for Information Technology Equipment. The 2017 NEC no longer includes the definition for ITE in Article 645, but 2017 NFPA 75 does and it includes the 600V limit. In

Re: [PSES] Measurement Accuracy

Thanks for the link to that paper Rich, it makes for interesting reading in plain English. James From: Richard Nute [mailto:ri...@ieee.org] Sent: 20 September 2016 21:18 To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Measurement Accuracy … I didn’t know what “uncertainty” is, so I did a

[PSES] Wireless certification for large scale industrial equipment for professional use.

I have questions on wireless in fixed Large scale stationary industrial equipment (permanent connected 3 phase, 150A / phase , 1000 Kgm  ). Can you help me with the following wireless questions? 1) Purchased wireless device:a)  Can the wireless device be designed permanently into the

Re: [PSES] standard for power suply for server room.

Bostjan I would seriously consider pointing out to your customer that their specified supply voltage is not a common one (at all) and ask them to state in more detail the system configuration which will provide it, and then you should know more clearly what you are up against and how to

[PSES] Job opening - OSHA NRTL Program

Hello All, I wanted to share a position opening in OSHA's Nationally Recognized Testing Laboratory (NRTL) Program as an engineer and laboratory assessor. The position is located in Washington DC. Additional details can be found at: https://www.usajobs.gov/GetJob/ViewDetails/451085800 If you

Re: [PSES] standard for power suply for server room.

Hi Zhang, I do not know what technology they use for generating 750VDC. It could be some new technology. They do not need to cover ITU or ETSI standards. Best regards, Bostjan From: Zhangguoqing (A) [mailto:zhangguoq...@huawei.com] Sent: Wednesday, September 21, 2016 11:24 AM To: Boštjan

Re: [PSES] standard for power suply for server room.

Hi Bostjan, Why your Customer ask for 750Vdc input power supply? Normally for the DC input data centre equipments , the input is 400Vdc. Please find the standard ITU L.1200 and ITU L.1201, or ETSI 300 132-3-1, or ATIS-0600315.01.2015. Best Regards, ZHANG Guoqing Huawei Technologies Duesseldorf

Re: [PSES] standard for power suply for server room.

If this is for European approval, one may simply use EN 60950 and make up a Technical construction file listing the essential differences. A decent (now mandatory anyway) risk analysis would cover these differences, showing up as in individual risks. You may then choose to extrapolate 6950