Re: [PSES] Machinery Leakage Current

2022-02-02 Thread MIKE SHERMAN 
Mark --

Interesting question!

I would agree with 3.5 mA for cord and plug connected stationary equipment up 
to several HP. However, note that 8.2.6e) of 60204-1 describes cord and plug 
connected equipment with leakage above 10 mA.

However, I think that a quite large piece of machinery that could fall under 
the scope of 60204-1 might well have leakage currents above 10 mA, making it 
hard to set an absolute limit. As 8.2.6 suggests, such a high current is 
probably best addressed by very robust grounding, as well as bonding.

Note also that for North America, UL limits are generally quite lower than 3.5 
mA.

Mike Sherman
Retired Product Safety Engineer


> On 02/01/2022 12:24 PM Stultz, Mark 
> <0f79f2e10e47-dmarc-requ...@listserv.ieee.org> wrote:
> 
> 
> 
> Hello,
> 
> Is there a hard limit for leakage current for machinery in the EU?  IEC 
> 60204-1 provides instructions in clause 8.2.8 for “equipment having earth 
> leakage currents higher than 10 mA”.  This seems quite high so we have 
> applied the 3.5 mA limits for class 1 stationary equipment in IEC 60335-1.  
> Is there another source for leakage current limits that is 
> machinery-specific?  There is nothing in the type-C standard for this product 
> type.
> 
>  
> 
> Thanks,
> 
>  
> 
> Mark Stultz
> 
> 
> 
> -
> 
> 
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Re: [PSES] Minimizing EM radiation from a 5G multi device test lab

2022-02-02 Thread doug emcesd.com 
Hi Chas and the group,

Why not just turn down the RF power on your router a bit? Doing this also 
improves security. You can also change channel assignments as well but that may 
require coordination with the others in the building. But lowering the power 
level does not. Just set it to be adequate in your space.

Doug
[cid:image001.jpg@01D8183B.D5BC3C90]

From: Charles Grasso 
Sent: Wednesday, February 2, 2022 11:45
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: [PSES] Minimizing EM radiation from a 5G multi device test lab

Greetings from snowy Colorado!

We have multiple WIFI devices in a lab and we need to suppress the RF signals 
(NOT EMI) to reduce the interference from affecting other WIFI areas of the 
building.

Does anyone know of a cheap and effective way of doing this?


TIA

Chas




--
Charles Grasso
Dish Technologies
 (c) 303-204-2974
(h) 303-317-5530
(e ) charles.gra...@dish.com
(e2) chasgra...@gmail.com
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Re: [PSES] Minimizing EM radiation from a 5G multi device test lab

2022-02-02 Thread John E Allen 
Get in the respective network Router settings and ensure the various WiFi 
networks are not using the same channels numbers – & use a wifi inspection App 
(something like “WiFi Analsyer”) on a mobile phone to look for unused/ low 
signal strength channels to help you choose the ones that allow each network to 
use the least used in that area of the building.

 

NB: might need to get the paid-for version of the App to ensure it can display 
all the relevant WiFi bands!

 

John E Allen

W. London, UK

 

From: Charles Grasso  
Sent: 02 February 2022 19:45
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: [PSES] Minimizing EM radiation from a 5G multi device test lab

 

Greetings from snowy Colorado!

 

We have multiple WIFI devices in a lab and we need to suppress the RF signals 
(NOT EMI) to reduce the interference from affecting other WIFI areas of the 
building.

Does anyone know of a cheap and effective way of doing this? 

 

 

TIA

 

Chas

 

 

 

 

-- 

Charles Grasso

Dish Technologies

 (c) 303-204-2974

(h) 303-317-5530

(e ) charles.gra...@dish.com  

(e2) chasgra...@gmail.com  

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Re: [PSES] Minimizing EM radiation from a 5G multi device test lab

2022-02-02 Thread Lfresearch 
Hi Chas,

You may want to try adding conductive wallpaper. I have seen this to be very 
effective. Indeed, I have seen this work well just using commercial baking foil 
and some wall paper paste.

It’s a fun project.

Cheers,

Derek.

> On Feb 2, 2022, at 1:44 PM, Charles Grasso  wrote:
> 
> Greetings from snowy Colorado!
> 
> We have multiple WIFI devices in a lab and we need to suppress the RF signals 
> (NOT EMI) to reduce the interference from affecting other WIFI areas of the 
> building.
> 
> Does anyone know of a cheap and effective way of doing this? 
> 
> 
> TIA
> 
> Chas
> 
> 
> 
> 
> -- 
> Charles Grasso
> 
> Dish Technologies
> 
>  (c) 303-204-2974
> 
> (h) 303-317-5530
> 
> (e ) charles.gra...@dish.com 
> (e2) chasgra...@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 
> 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.
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> David Heald mailto:dhe...@gmail.com>>
> 


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[PSES] Minimizing EM radiation from a 5G multi device test lab

2022-02-02 Thread Charles Grasso 
Greetings from snowy Colorado!

We have multiple WIFI devices in a lab and we need to suppress the RF
signals (NOT EMI) to reduce the interference from affecting other WIFI
areas of the building.

Does anyone know of a cheap and effective way of doing this?


TIA

Chas




-- 

Charles Grasso

Dish Technologies

 (c) 303-204-2974

(h) 303-317-5530

(e ) charles.gra...@dish.com

(e2) chasgra...@gmail.com

-

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