John,

I think surge suppression on power strips is more of a Marketing Gimmick than 
anything. We all know that in a real world surge event, the device that fires 
first will take the brunt of the hit, and may not survive a second hit. Power 
strips have become a throw-away item but maybe it is better than nothing.

The built in surge suppression in your $3000 computer will easily protect your 
$5 power strip. But your computer may not survive more than one hit.

The Other Brian

From: John Woodgate [mailto:jmw1...@btinternet.com]
Sent: Friday, September 15, 2017 9:10 AM
To: Kunde, Brian; EMC-PSTC@LISTSERV.IEEE.ORG
Subject: RE: [PSES] power strip details

Is this surge suppression a) effective, b) necessary? I have seen comments that 
suggest 'No' for both a) and b).

With best wishes DESIGN IT IN! OOO - Own Opinions Only
www.jmwa.demon.co.uk<http://www.jmwa.demon.co.uk/> J M Woodgate and Associates 
Rayleigh England

UK is a sovereignty, not a Zollverein-ty

From: Kunde, Brian [mailto:brian_ku...@lecotc.com]
Sent: Friday, September 15, 2017 1:44 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG<mailto:EMC-PSTC@LISTSERV.IEEE.ORG>
Subject: Re: [PSES] power strip details

This is slightly off topic but you might find this interesting.  People are too 
smart for their own good.

When Yanks travel to Europe, they bring along their phone chargers, computer 
chargers, notepad chargers, razer chargers, etc., all of which will operate at 
either 115Vac or 230Vac these days. So, instead of buying a bunch of plug 
adaptors, the logical thing to do is to buy one plug adaptor, put it on a North 
American power strip, and plug all their Tech into the strip. Smart, right?

Well, most North American power strips have built in Surge suppression and as 
soon as they get to Europe and plug it in, BAM!! SMOKE!!!

I know two people who have done this.

Enjoy your weekend.

The Other Brian

From: John Woodgate [mailto:jmw1...@btinternet.com]
Sent: Friday, September 15, 2017 8:29 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG<mailto:EMC-PSTC@LISTSERV.IEEE.ORG>
Subject: Re: [PSES] power strip details

Yes, the marking on these is not well-formatted. The three numbers are 
*independent* limits, the 3680 W being 16 A at 230 V, but the strip could be 
used on supplies up to 250 V as long as neither of the other limits was 
exceeded.

Better would be 'Maximum ratings: 16 A, 250 V, 3680 W'

With best wishes DESIGN IT IN! OOO - Own Opinions Only
www.jmwa.demon.co.uk<http://www.jmwa.demon.co.uk/> J M Woodgate and Associates 
Rayleigh England

UK is a sovereignty, not a Zollverein-ty

From: Don Gies [mailto:ddg...@verizon.net]
Sent: Friday, September 15, 2017 1:16 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG<mailto:EMC-PSTC@LISTSERV.IEEE.ORG>
Subject: Re: [PSES] power strip details

Pete,

Before last year's TC108 meeting in Frankfurt, I purchased a German Schucko 
European Power Strip from Amazon.  It had 3 AC receptacles and 2 USB outputs.
 Its ratings are:
"Maximum Charge: 3680W,16A/250V~    "

Don Gies
ddg...@verizon.net<mailto:ddg...@verizon.net>
(732) 207-7828

From: John Allen [mailto:000009cc677f395b-dmarc-requ...@ieee.org]
Sent: Friday, September 15, 2017 4:32 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG<mailto:EMC-PSTC@LISTSERV.IEEE.ORG>
Subject: Re: [PSES] power strip details

Unlike the US/Canada (etc), there is no derating factor for UK mains wall 
outlets. A 13A wall outlet can be loaded at 13A, and a twin/duplex 13A outlet 
can be loaded at 13A per outlet because the "diversity factor" principle is 
applied, i.e. it is highly unlikely in practice that both 13A outlets will be 
actually be fully loaded at the same time!

Murphy's Law may however apply at times in that both outlets could 
simultaneously be loaded at 13A - and so it is to be hoped that the wall outlet 
in question is on a UK "ring main" circuit protected by a 32A breaker, and not 
a spur/radial/branch circuit protected by a 16A breaker!

For a power strip plugged into one of those outlets, there is a (generally, as 
John W said) a 13A fuse in the plug, and so the max cumulative continuous load 
for the sockets in the strip is also 13A - unless, of course, the mfr has 
decided to give it an overall lower current rating, fitted a lower-rated fuse 
AND marked the plug with that rating. BTW: I have also occasionally seen 7A 
fuses (the fuse standard is BS1362, but, AFAIK, that only shows a few 
"standard" ratings, and not some of those which are actually sold - such as 
those listed here http://cpc.farnell.com/search?st=plug%20top%20fuse)

I believe that the standard for such UK power strips is probably BS 
5733:2010+A1:2014 "General requirements for electrical accessories. 
Specification" - but don't have a copy and so can't comment in detail on what 
it requires.

John Allen
W.London, UK



From: John Woodgate [mailto:jmw1...@btinternet.com]
Sent: 15 September 2017 07:36
To: EMC-PSTC@LISTSERV.IEEE.ORG<mailto:EMC-PSTC@LISTSERV.IEEE.ORG>
Subject: Re: [PSES] power strip details

UK household power strips are rated at 13 A and include a 13 A fuse. Other 
fuses, normally used in plugs, are 3 A, 5 A and 10 A. I have seen a 1 A fuse, 
but they are very rare.

With best wishes DESIGN IT IN! OOO - Own Opinions Only
www.jmwa.demon.co.uk<http://www.jmwa.demon.co.uk/> J M Woodgate and Associates 
Rayleigh England

UK is a sovereignty, not a Zollverein-ty

From: Pete Perkins [mailto:00000061f3f32d0c-dmarc-requ...@ieee.org]
Sent: Friday, September 15, 2017 5:55 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG<mailto:EMC-PSTC@LISTSERV.IEEE.ORG>
Subject: [PSES] power strip details

Esteemed colleagues,

                Here in North America a domestic or commercial multi-outlet 
power strip would be cord connected thru a duplex outlet protected by a 15A (or 
sometimes 20A) circuit breaker.  The max load allowed in the circuit by the US 
NEC would be (80% of 15A) 12A for the total load (or 80% of 20A) 16A on the 20A 
breaker.   Note that the US NEC requires that any device plugged into a duplex 
outlet must not use the full load capacity of the circuit - 20% must be left 
for the other outlet's load.

                Trying to understand the loading basis for a Euro power strip.  
Is the usual protection a 10A breaker? And would the power strip be rated and 
evaluated at that load level?  What other considerations come into play here?

                How about a UK power strip.   The usual protection is the 13A 
fuse in the power plug (altho smaller values seemed to be used also).  Would 
the power strip be rated and evaluated at that load level?  What other 
considerations come into play here.

                For a Japanese power strip what is the normal breaker 
protection for the installed circuit?  What would be the max rated load for the 
power strip?  What other considerations come into play here also?

                Looking forward to your replies on this issue.

:>)     br,      Pete

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

503/452-1201

p.perk...@ieee.org<mailto:p.perk...@ieee.org>

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________________________________
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