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#283987 - 03/04/17 10:46 PM Re: Power Outage (caution: Dark Subject) [Re: Nomad]
dougwalkabout Offline
Crazy Canuck
Carpal Tunnel

Registered: 02/03/07
Posts: 2538
Loc: Alberta, Canada
Originally Posted By: Nomad
The spare system is stored in a 33' long aluminum trailer that provides pretty good farady shielding. Should survive all but the most severe EMP event.


Err, pardon my ignorance, but doesn't a Faraday cage need to be iron/steel? I thought an aluminum shell would do nothing at all.

My understanding was that the ferrous metal acts like an antenna, converting most of the electromagnetic wave to electricity in the cage rather than inside the electronic equipment. If properly grounded, the charge would be shunted to ground.

But I'm not an engineer, so I defer to those who know better.

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#283988 - 03/04/17 10:48 PM Re: Power Outage (caution: Dark Subject) [Re: dougwalkabout]
hikermor Offline
Geezer in Chief
Geezer

Registered: 08/26/06
Posts: 5728
Loc: southern Cal
You are certainly correct about the inefficiencies of a traditional fireplace, and this would be very significant living in Canada.

But some of us reside in sunnier climes, like southern California. In thirty years in So Cal, I have never seen frost in my town and on only one occasion on an outlying island. So we can dedicate fireplaces to their highest and best uses, toasting marshmallows and raising morale. They are pretty good at chasing the chill away.
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#284025 - 03/06/17 04:50 PM Re: Power Outage (caution: Dark Subject) [Re: hikermor]
hikermor Offline
Geezer in Chief
Geezer

Registered: 08/26/06
Posts: 5728
Loc: southern Cal
An addendum to my previous post. Another very fine solar powered light would be any of the Luci (brand name) inflatable lights. There are probably other makes which follow the same basic scheme. A small solar panel, an array of LEDs, and an inflatable bag provide a very fine diffuse light, suitable for dining or use in a tent. They are also very cheap and quite compact when not inflated. In uninflated condition, they perform decently as a flashlight.
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#284026 - 03/06/17 07:07 PM Re: Power Outage (caution: Dark Subject) [Re: hikermor]
Russ Offline
Carpal Tunnel

Registered: 06/02/06
Posts: 4436
Loc: SOCAL
I like the Luci inflatable light and have put two of the Lux (warm white version) in my Amazon.com cart. Thanks for the tip.

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#284046 - 03/12/17 04:20 PM Re: Power Outage (caution: Dark Subject) [Re: Russ]
Russ Offline
Carpal Tunnel

Registered: 06/02/06
Posts: 4436
Loc: SOCAL
For the record, the Luci Lux lights I received work great. The battery is 3.7 volt lithium polymer and I ran one all last night as a night-light in the kitchen. Plenty of illumination and softer hues than the normal wall socket night light.

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#284048 - 03/12/17 05:32 PM Re: Power Outage (caution: Dark Subject) [Re: Russ]
hikermor Offline
Geezer in Chief
Geezer

Registered: 08/26/06
Posts: 5728
Loc: southern Cal
Because of a little problem with our kitchen lighting last night, I broke out the Luci's, suspended over the kitchen sink and work counter. My darling DW, who does not care for the dark, and I both agreed that the Luci's lent a festive atmosphere to the surroundings.

Dollar for dollar, they are an excellent value in emergency/supplementary lighting. I'll probably pick up a few more myself. (I love Luci??)
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#284051 - 03/13/17 06:44 PM Re: Power Outage (caution: Dark Subject) [Re: dougwalkabout]
MoBOB Offline
Veteran

Registered: 09/17/07
Posts: 1203
Loc: here
I am going to take a stab at this one: First - I am not an engineer. Second - I am a regular with a little (very little) electrical/electronics background. Third - I would say that since aluminum does conduct electricity (electromagnetic energy) it could be used as a Faraday cage.
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"Its not a matter of being ready as it is being prepared" -- B. E. J. Taylor

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#284052 - 03/13/17 07:51 PM Re: Power Outage (caution: Dark Subject) [Re: MoBOB]
bws48 Offline
Old Hand

Registered: 08/18/07
Posts: 786
Loc: Anne Arundel County, Maryland
Originally Posted By: MoBOB
. . . I would say that since aluminum does conduct electricity (electromagnetic energy) it could be used as a Faraday cage.


Absolutely. Our old (vintage early 1970s) house had aluminium wiring.
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#284053 - 03/13/17 08:09 PM Re: Power Outage (caution: Dark Subject) [Re: hikermor]
Ian Offline
Member

Registered: 05/15/07
Posts: 163
Loc: Scotland
The aluminium will shield the electrical component of the electromagnetic energy but it cannot shield the magnetic component.

Transmitted radio waves consist of both and one cannot exist without the other. (It's complicated)

https://en.wikipedia.org/wiki/Electromagnetic_field

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#284054 - 03/14/17 03:38 AM Re: Power Outage (caution: Dark Subject) [Re: bws48]
MoBOB Offline
Veteran

Registered: 09/17/07
Posts: 1203
Loc: here
Originally Posted By: bws48


Absolutely. Our old (vintage early 1970s) house had aluminum wiring.
Brittle and resistive. Many a house on wheels went up in flames due to aluminum wiring being the incorrect gauge.


Edited by MoBOB (03/14/17 03:39 AM)
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