Re: [PSES] Clarifications for Functional Earthing

[Nyffenegger, Dave]

Folks,

I've got a few additional questions in addition to the use of the 5017 symbol.

I've had several consultants/inspectors comment that only a single 
earthing/bonding conductor can be attached to each wiring terminal but I can't 
find any actual standards calling for this (for PERMANENTLY CONNECTED EQUIPMENT 
having a NON-DETACHABLE POWER SUPPLY CORD).  Specifically for example putting 
multiple bonding conductor ring terminals on a single stud.

The only reference I found is EN 60950-1:2006 2.6.4.3 "Separate wiring 
terminals, which may be on the same busbar, shall be provided, one for the 
PROTECTIVE EARTHING CONDUCTOR, or one for each PROTECTIVE EARTHING CONDUCTOR if 
more than one is provided, and one or more for PROTECTIVE BONDING CONDUCTORS.  
However, it is permitted to provide a single wiring terminal of the screw or 
stud type in PERMANENTLY CONNECTED EQUIPMENT having a NON-DETACHABLE POWER 
SUPPLY CORD, and in PLUGGABLE EQUIPMENT having a special NON-DETACHABLE POWER 
SUPPLY CORD, provided that the wiring termination of the PROTECTIVE EARTHING 
CONDUCTOR is separated by a nut from that of the PROTECTIVE BONDING CONDUCTORS. 
The order of stacking of the terminations of the PROTECTIVE EARTHING CONDUCTOR 
and the PROTECTIVE BONDING CONDUCTORS is not specified."

This specifically does allow multiple bonding conductors attached to a single 
stud.Does anyone know of any standards restricting individual bonding 
conductors to separate terminals (for PERMANENTLY CONNECTED IT EQUIPMENT having 
a NON-DETACHABLE POWER SUPPLY CORD)?

Small motors (AC/DC fractional HP, 1,2,3 HP etc) typically have an integrated 
wiring junction box which includes a dedicated chassis ground screw inside.   
If such a motor is mounted to a bonded frame is necessary to connect a 
protective bonding conductor to the provided ground screw?  Are there any 
specific standards that cover this or is it dependent on the motor 
specifications/construction file?

Thanks
-Dave

-Original Message-
From: Nyffenegger, Dave [mailto:dave.nyffeneg...@bhemail.com] 
Sent: Monday, January 06, 2014 4:54 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Clarifications for Functional Earthing

Rich, 

thanks for the input.  I guess I need to be clear if I'm asking about 
construction identification vs. schematic drawings.  I'm not hung up on 
physically identifying any functional earth connections (to GRN/YEL terminal 
blocks) inside the actual hardware, these can be identified with approved 
insulation color and/or other appropriate labeling.  My question with regards 
to function earth identification is primarily on the schematics.  For example, 
which symbol to use to represent that functional earth connection to the 
GRN/YEL terminal block.  Not 5019 or 5017 and I think not 5020. So that leaves 
perhaps 5018 Noiseless (clean) earth (ground) or 5021 Equipotentiality.  Can 
anyone else cite any standards or examples relevant to using these symbols for 
functional earth connections?

You stated "Since you have quoted 60950-1, you cannot use the 5017 symbol ".  
Can you clarify this?  EN 60950-1:2006 1.7.7.1 states "It is not a requirement 
to mark terminals for PROTECTIVE BONDING CONDUCTORS, but where such terminals 
are marked, the symbol (IEC 60417-5017 (DB:2002-10)) shall be used." and 2.6.2 
states " − wiring terminals to be used only for FUNCTIONAL EARTHING shall not 
be marked by the symbol (60417-IEC-5017) or by the symbol (60417-IEC-5019), 
except that, where a wiring terminal is provided on a component (for example, a 
terminal block) or subassembly, the symbol [5017] is permitted; "

Since 5019 is used (once) for the main protective earth connection my question 
was to clarify that 5017 could/should be used on schematics to show all of the 
protective bonding connections.

-Dave

-Original Message-
From: Richard Nute [mailto:ri...@ieee.org] 
Sent: Monday, January 06, 2014 2:48 PM
To: Nyffenegger, Dave; EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Clarifications for Functional Earthing


Hi Dave:


On 1/5/2014 8:36 PM, Nyffenegger, Dave wrote:
> So you are saying DIN GRN/YEL rail terminal block indicates bonding conductor 
> and it's OK to use this to connect functional earth to chassis even if there 
> are no other bonding conductors needed and connected to the DIN GRN/YEL 
> terminal block?
Yes.
> 60417-5018 is defined as "Noiseless (clean) earth (ground): To identify a 
> noiseless (clean) earth (ground) terminal, e.g. of a specially designed 
> earthing (grounding) system to avoid causing malfunction of the equipment."  
> So functional earth connections to the DIN GRN/YEL terminal block  as 
> described above should be shown using the 5018 symbol right (yes, the chassis 
> does have a dedicated PE stud)?
In my opinion, you don't need any marking to connect a functional earth 
conductor to a DIN GRN/YEL terminal block.
> And since by definition this ground is earth no need to show a line between 
> 5018 

[PSES] Modem EMC testing

[Chris Wells]

I have a product where we added a Multitech modem module as per their
examples and ran it through UL/CUL safety evaluation already.

I am looking for some advice on a clean way to do EMC testing on this POTS
Modem interface.

Both emissions (looking for FCC class B) and immunity to IEC61326 

 

I have never evaluated a modem before.

I assume there is a way to simulate a POTS interface and isolate my aux
monitoring equipment .

Any feedback would be appreciated.

 

Chris Wells

Eaton

 

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Re: [PSES] Risk Assessments and mitigation for EMC chambers

[John Woodgate]

In message , 
dated Thu, 9 Jan 2014, Charlie Blackham  
writes:


Anyone have any documents or stories to share as to how they have 
satisfied/pacified/dismissed enthusiastic Health & Safety officers who 
still want to ?do something??


A safety briefing won't help if a 400 lb EUT slips off the turntable on 
to your foot. I think emergency stops are not only reasonable but would 
be required by law in some jurisdictions, and I don't see any EMC 
issues. Flashing lights are another matter; EMC issues exist and 
implementation is not as easy as for emergency stops.


Can you show that the applicable human exposure limits cannot anywhere 
be exceeded with the max amplifier and antenna?

--
OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk
Nondum ex silvis sumus
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK

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Re: [PSES] Risk Assessments and mitigation for EMC chambers

[Pettit, Ghery]

Labs I've built in the past have an interlock on the door(s) to shut down RF to 
the antennas and/or amplifiers when the doors are unlatched.  Lights at the 
control point show the status (red - open, green - closed).  The turntables 
were interlocked to the hatch for access to the turntable pit.  With the hatch 
open, no turntable rotation.

Ghery S. Pettit

From: Charlie Blackham [mailto:char...@sulisconsultants.com]
Sent: Thursday, January 09, 2014 12:39 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: [PSES] Risk Assessments and mitigation for EMC chambers

All

Client has performed risk assessment for turntables and high RF fields in their 
anechoic chambers and is looking at implementing emergency stops for the former 
and flashing lights warning of the later. (I've never seen flashing lights at 
other labs whilst witnessing tests up to 350 V/m, and the client chamber will 
only be used with amps < 250 W).

The turntable is not flush to the floor, so does present more hazard than some, 
and some operation does require people to be on or adjacent to the turntable 
for operation/maintenance.

There is already plenty of good "process" and supporting documentation and 
everyone with access to the chambers have already been through a thorough 
safety briefing.
Anyone have any documents or stories to share as to how they have 
satisfied/pacified/dismissed enthusiastic Health & Safety officers who still 
want to "do something"?

Regards
Charlie

Charlie Blackham
Sulis Consultants Ltd
Tel: +44 (0)7946 624317
Web: www.sulisconsultants.com
Registered in England and Wales, number 05466247

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[PSES] Risk Assessments and mitigation for EMC chambers

[Charlie Blackham]

All

Client has performed risk assessment for turntables and high RF fields in their 
anechoic chambers and is looking at implementing emergency stops for the former 
and flashing lights warning of the later. (I've never seen flashing lights at 
other labs whilst witnessing tests up to 350 V/m, and the client chamber will 
only be used with amps < 250 W).

The turntable is not flush to the floor, so does present more hazard than some, 
and some operation does require people to be on or adjacent to the turntable 
for operation/maintenance.

There is already plenty of good "process" and supporting documentation and 
everyone with access to the chambers have already been through a thorough 
safety briefing.
Anyone have any documents or stories to share as to how they have 
satisfied/pacified/dismissed enthusiastic Health & Safety officers who still 
want to "do something"?

Regards
Charlie

Charlie Blackham
Sulis Consultants Ltd
Tel: +44 (0)7946 624317
Web: www.sulisconsultants.com
Registered in England and Wales, number 05466247


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[PSES] Saudi Arabia Wifi 5GHz band used?

[Chris]

Folks,

Our software team asked me a DFS band KSA question below which 


Question: can
we use 5250-5350MHz and 5470-5745MHz band in KSA as per CITC rules?


CITC document RI045 does reference EN301 893 @ 200 mW e.i.r.p Max mean
for 5250-5350MHz 

and 5470-5725MHz band with reference EN301 893 @ 1000mW Max mean

Any KSA info from Wi-Fi manufacturers/test labs/compliance experts would be 
helpful and appreciated.

regards

Christopher

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[PSES] Product Regulatory Compliance manager - Minneapolis

[Bender, Curtis]

Tennant Company is hiring a Product Regulatory Compliance manager for our 
Minneapolis, MN USA office. Apply at the link below and please direct questions 
through those means as I am not the hiring manager.

https://tennant.silkroad.com/epostings/index.cfm?fuseaction=app.jobinfo&jobid=303284&version=1
Curt

Curtis Bender | Manager - Global Product Regulatory Compliance
www.tennantco.com
Tennant Company | Creating a cleaner, safer, 
healthier world since 1870.


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