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Re: [89attendees] Mystery Power Outlet

"DRAGE, Keith (Keith)" <keith.drage@alcatel-lucent.com> Mon, 03 March 2014 10:52 UTC

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From: "DRAGE, Keith (Keith)" <keith.drage@alcatel-lucent.com>
To: Adam Roach <adam@nostrum.com>, Warren Kumari <warren@kumari.net>, "Ole Jacobsen" <olejacobsen@me.com>
Thread-Topic: [89attendees] Mystery Power Outlet
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Date: Mon, 3 Mar 2014 10:52:46 +0000
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Cc: Ben Campbell <ben@nostrum.com>, "89attendees@ietf.org" <89attendees@ietf.org>
Subject: Re: [89attendees] Mystery Power Outlet
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The 13A square pin plugs are fused.

All the round pin plugs I have ever seen do not have a fuse. I believe a fused version does exist but I have never seen one. The lack of a fuse is why they are used in theatre installations (they are fused at the distribution point, as was normal for round pin house installations).  

Stage lights (which is what we were using then) in the UK come in 500W, 1kW, 2kW and 5kW - it doesn't take many to make up a 30A load - it is only recently that LED lights have been introduced, and even then their adoption is slow because of the poor colour control.

Keith

> -----Original Message-----
> From: Adam Roach [mailto:adam@nostrum.com] 
> Sent: 03 March 2014 10:45
> To: DRAGE, Keith (Keith); Warren Kumari; Ole Jacobsen
> Cc: Ben Campbell; 89attendees@ietf.org
> Subject: Re: [89attendees] Mystery Power Outlet
> 
> On 3/3/14 10:27, DRAGE, Keith (Keith) wrote:
> > Way back when I was at college, the power feed for the 
> disco lighting used to be an ad-hoc arrangement of 2 5A 
> sockets through which we used to regularly draw 30A, with no 
> sign of them getting hot at all.
> 
> I thought I just read an assertion on this thread that the 
> plugs are fused, and an inspection of outlets leads me to 
> believe than many of them are as well. Are the fuses required 
> to actually kick out at some point?
> 
> On a side note, I'm a bit in awe that you were drawing on the 
> order of 7 kVA of power for your lighting. That's like 24,000 
> BTU/hr, expressed almost entirely as heat. You'd raise the 
> temperature of an average 1000 sq.ft. (92 m²) room by 27°F (15°C).
> 
> /a
>

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