Ralph -- 

Pete Perkins is the expert. 

0.5 mA is the "reaction/startle" threshold. 

6 mA gets you into where some of the population experiences muscle contraction 
("letgo-immobilization"). 

I don't know the risk trade-offs various committees made to get from 5 mA to 
15, 25, or 30. 

Mike 

----- Original Message -----

From: "Ralph McDiarmid" <ralph.mcdiar...@schneider-electric.com> 
To: "EMC-PSTC" <EMC-PSTC@LISTSERV.IEEE.ORG> 
Sent: Wednesday, January 31, 2018 12:02:37 PM 
Subject: Re: [PSES] GFCI vs GFPE discussion 

“current limit of 30mA protects 95 % of the population” 

They didn’t want to try for 100% ? I'm no expert and I don't know if we have 
one on this forum for this complex topic, but ask how can one limit be 5X the 
other and still afford the same level of protection? Perhaps not intended to, 
as in shock versus electrocution protection. 

Is 6mA enough for strong muscle reaction or a startle reaction sufficient to 
cause someone to loose balance for instance? 

Still, some protection better than none at all. 

Ralph McDiarmid 
Product Compliance Specialist 
Solar Business 
Schneider Electric 


From: Pete Perkins [mailto:00000061f3f32d0c-dmarc-requ...@ieee.org] 
Sent: Tuesday, January 30, 2018 10:06 PM 
To: EMC-PSTC@LISTSERV.IEEE.ORG 
Subject: Re: [PSES] GFCI vs GFPE discussion 

Brian, et al 

Low current protection devices are intended to protect people. 

The long term letgo-immobilization current of 5mA covers the full population 
and opens any circuit which exceeds this level (ok, the UL limit for GFCIs is 
4mA to 6 mA), But you get the idea. 

The long term Ventricular Fibrillation current limit of 30mA protects 95 % of 
the population on the face of the earth. The Euro systems use of RCDs require 
this protection in many installations (but I’m not familiar with the 
installation code details). 

Here in the US we are developing protection devices that will work at 15 mA and 
25 mA. These are intended for use with charging electric vehicles. The 15 mA 
device will be used in residential installations and the 25 mA device will be 
used in commercial installations (haven’t followed the code development but 
believe that this is how it is going). 

All of these devices have been designed for sinusoidal AC systems and they all 
have false tripping issues when used with equipment with line switching. SMPS 
and VSD units are a problem today in that they trip a small number of 
protection devices; their use is spreading into many more types of products. 
From my perspective the units each have a statistical range of protection or 
operation and they seem to overlap a small percentage of the time; this gives 
rise to ‘nuisance tripping’ (meaning undiagnosed tripping). This is an issue 
both in North America (GFCI & AFCI country) as well as the EuroZone (RCD 
devices). 

I worked with a student project last year which published a paper for the 2017 
IEEE PSES ISPCE Symposium; Yuen et al, ‘Why do GFCIs keep tripping’. This paper 
show that some GFCIs can be tricked into operating when they shouldn’t. 

The non-sinusoidal nature of the earth/ground current as well as the CM/DM 
signals have not been fully understood nor taken care of in a harmonized way 
between the protection device and the load. 

Lot’s of opportunity here for investigation and recommendation of mitigation 
techniques. 

:>) br, Pete 

Peter E Perkins, PE 
Principal Product Safety & Regulatory Affairs Consultant 
PO Box 23427 
Tigard, ORe 97281-3427 

503/452-1201 

IEEE Life Fellow 
mailto:p.perk...@ieee.org 

From: Kunde, Brian [mailto:brian_ku...@lecotc.com] 
Sent: Tuesday, January 30, 2018 2:04 PM 
To: mailto:EMC-PSTC@LISTSERV.IEEE.ORG 
Subject: [PSES] GFCI vs GFPE 

I’ve recently come to understand that the 30mA Ground-Fault protectors, often 
built into a circuit breaker, is intended to protect the Protective Earth 
(Safety Ground) circuit in the case of a short circuit (opening the circuit 
before the safety ground could be damaged. It this correct? 

Here is my question. I’m evaluating a cut-off saw (5hp) which uses water to 
keep the blade and material cool. The manufacturer uses a 3-phase supplementary 
circuit breaker which includes the 30mA GFPE option. This is a very expensive 
part. When I asked them why they use the GFPE part, they couldn’t give me a 
good answer. 

Would such a part be required on a 3-phase motor driven cutoff saw in either 
North America or Europe? What standard would dictate this? 

If the only purpose of a GFPE is to protect the Ground Circuit, on products 
that can handle shorts without damaging the ground circuit, would a GFPE still 
be necessary? 

Where are GFPE typically used? What industry? 

Please educate me. This is a new one on me. 

Thanks, 
Brian 

From: Doug Nix [mailto:d...@ieee.org] 
Sent: Friday, January 26, 2018 2:48 PM 
To: mailto:EMC-PSTC@LISTSERV.IEEE.ORG 
Subject: [PSES] JOB POSTING - ONTARIO, CANADA 

PLEASE CONTACT TED TYCZKA DIRECTLY 

A very notable, “high-profile” client who is seeking a Safety & Services 
Sales/Business Development Professional - to join their Machine Services 
Division - the focus of the role is to spearhead/lead the sale of Engineering 
Services related to “functional safety.” 

The company sells safety training (workshops), machine assessment/audits, 
engineering design per CSA and/or TUV Safety requirements (“Regulatory 
Compliance”). The company also sells Remediation and Repair Services (of 
industrial machines) together with Service Contracts ... to customers in the 
aerospace, automotive, forestry, food & beverage, as well as, the packaging 
sectors. 

The Safety & Services/Business Development Professional can work from a home 
office - anywhere in Ontario. A Bachelor of Science in Mechanical or Electrical 
Engineering, together with the sale of Machine Safeguard devices and the 
application of these, would be desired ... together, with some exposure to 
Industrial Automation and perhaps Robotics. The key is to have some knowledge 
of safety components, safety scanners, switches, controllers, etc. as well as 
machine building experience. 

The employer (a very reputable, Global entity/brand) ... who provide a very 
competitive base salary, lucrative annual bonus/incentive program vs. results, 
plus monthly car allowance, Benefits, Matching RRSP + (Training, Career 
Opportunities and upward mobility). 

They are good people, seek an ambitious self-starter who can cover sales from 
the “shop floor” level to the “C Suite” (Boardroom). The company have 
established Sales Reps across Canada ... who can work with the Safety & 
Services Sales Specialist ... this role requires “consultative and solutions 
oriented selling ability. 

I will ensure absolute confidentiality. Nice opportunity with a great 
organization and strong, capable leadership. Thanks. 

Kind professional regards, 
Ted Tyczka 

President 
Golden Mile Management – Consulting Services 
2630 Eglinton Avenue East, Toronto, Ontario M1K 2S3 
Tel: (416) 266 - 4434 
Email: mailto:t...@gmmcs.com 
Website: http://www.gmmcs.com/ 
- 
---------------------------------------------------------------- 
This message is from the IEEE Product Safety Engineering Society emc-pstc 
discussion list. To post a message to the list, send your e-mail to 
<mailto:emc-p...@ieee.org> 
All emc-pstc postings are archived and searchable on the web at: 
http://www.ieee-pses.org/emc-pstc.html 
Attachments are not permitted but the IEEE PSES Online Communities site at 
http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used 
formats), large files, etc. 
Website: http://www.ieee-pses.org/ 
Instructions: http://www.ieee-pses.org/list.html 
List rules: http://www.ieee-pses.org/listrules.html 
For help, send mail to the list administrators: 
Scott Douglas <mailto:sdoug...@ieee.org> 
Mike Cantwell <mailto:mcantw...@ieee.org> 
For policy questions, send mail to: 
Jim Bacher <mailto:j.bac...@ieee.org> 
David Heald <mailto:dhe...@gmail.com> 
________________________________________ 
LECO Corporation Notice: This communication may contain confidential 
information intended for the named recipient(s) only. If you received this by 
mistake, please destroy it and notify us of the error. Thank you. 
- 
---------------------------------------------------------------- 
This message is from the IEEE Product Safety Engineering Society emc-pstc 
discussion list. To post a message to the list, send your e-mail to 
<mailto:emc-p...@ieee.org> 
All emc-pstc postings are archived and searchable on the web at: 
http://www.ieee-pses.org/emc-pstc.html 
Attachments are not permitted but the IEEE PSES Online Communities site at 
http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used 
formats), large files, etc. 
Website: http://www.ieee-pses.org/ 
Instructions: http://www.ieee-pses.org/list.html 
List rules: http://www.ieee-pses.org/listrules.html 
For help, send mail to the list administrators: 
Scott Douglas <mailto:sdoug...@ieee.org> 
Mike Cantwell <mailto:mcantw...@ieee.org> 
For policy questions, send mail to: 
Jim Bacher <mailto:j.bac...@ieee.org> 
David Heald <mailto:dhe...@gmail.com> 

______________________________________________________________________ 
This email has been scanned by the Symantec Email Security.cloud service. 
______________________________________________________________________ 
- 
---------------------------------------------------------------- 
This message is from the IEEE Product Safety Engineering Society emc-pstc 
discussion list. To post a message to the list, send your e-mail to 
<mailto:emc-p...@ieee.org> 
All emc-pstc postings are archived and searchable on the web at: 
http://www.ieee-pses.org/emc-pstc.html 
Attachments are not permitted but the IEEE PSES Online Communities site at 
http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used 
formats), large files, etc. 
Website: http://www.ieee-pses.org/ 
Instructions: http://www.ieee-pses.org/list.html 
List rules: http://www.ieee-pses.org/listrules.html 
For help, send mail to the list administrators: 
Scott Douglas <mailto:sdoug...@ieee.org> 
Mike Cantwell <mailto:mcantw...@ieee.org> 
For policy questions, send mail to: 
Jim Bacher <mailto:j.bac...@ieee.org> 
David Heald <mailto:dhe...@gmail.com> 

- 
---------------------------------------------------------------- 
This message is from the IEEE Product Safety Engineering Society emc-pstc 
discussion list. To post a message to the list, send your e-mail to 
<emc-p...@ieee.org> 

All emc-pstc postings are archived and searchable on the web at: 
http://www.ieee-pses.org/emc-pstc.html 

Attachments are not permitted but the IEEE PSES Online Communities site at 
http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used 
formats), large files, etc. 

Website: http://www.ieee-pses.org/ 
Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) 
List rules: http://www.ieee-pses.org/listrules.html 

For help, send mail to the list administrators: 
Scott Douglas <sdoug...@ieee.org> 
Mike Cantwell <mcantw...@ieee.org> 

For policy questions, send mail to: 
Jim Bacher: <j.bac...@ieee.org> 
David Heald: <dhe...@gmail.com> 


-
----------------------------------------------------------------
This message is from the IEEE Product Safety Engineering Society emc-pstc 
discussion list. To post a message to the list, send your e-mail to 
<emc-p...@ieee.org>

All emc-pstc postings are archived and searchable on the web at:
http://www.ieee-pses.org/emc-pstc.html

Attachments are not permitted but the IEEE PSES Online Communities site at 
http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used 
formats), large files, etc.

Website:  http://www.ieee-pses.org/
Instructions:  http://www.ieee-pses.org/list.html (including how to unsubscribe)
List rules: http://www.ieee-pses.org/listrules.html

For help, send mail to the list administrators:
Scott Douglas <sdoug...@ieee.org>
Mike Cantwell <mcantw...@ieee.org>

For policy questions, send mail to:
Jim Bacher:  <j.bac...@ieee.org>
David Heald: <dhe...@gmail.com>

Reply via email to