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FAST FRED (Fast_fred)
Registered Member
Username: Fast_fred

Post Number: 1494
Registered: 10-2006
Posted From: 69.19.14.18


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Posted on Wednesday, March 30, 2011 - 11:22 am:   

"Living well in a dump" was my tongue in cheek name for an article I wrote about a decade ago ,, a short piece on the concept of Load Shedding.

Living large with only 15A service , is easily done with a couple of relays , the ones I used were from Grainger's.

Now I'm trying to find that majic Grainger parts number or article to no avail.

Since that was 3 computers ago , looking in my file is not an option.

Anyone still using Load Shedding to help in poorer campgrounds?

FF
john w. roan (Chessie4905)
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Username: Chessie4905

Post Number: 2056
Registered: 10-2003
Posted From: 71.58.71.157


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Posted on Wednesday, March 30, 2011 - 4:48 pm:   

did you bring up their site to find them?
Sean Welsh (Sean)
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Username: Sean

Post Number: 1251
Registered: 1-2003
Posted From: 67.142.130.34


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Posted on Wednesday, March 30, 2011 - 5:04 pm:   

Fred,

We have such a load-shedding system. I used relays I had lying around, but there are several suitable types on the market. I have never found Grainger to be particularly competitive; you can get these from Del City and other suppliers for less.

What rating are you looking for?

-Sean
http://OurOdyssey.BlogSpot.com
marvin pack (Gomer)
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Username: Gomer

Post Number: 1318
Registered: 3-2007
Posted From: 71.55.183.81


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Posted on Wednesday, March 30, 2011 - 5:37 pm:   

Mcmaster-car also has switches. sometimes pricey but available.

Gomer
Pete/RTS Daytona (Pete_rtsdaytona)
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Username: Pete_rtsdaytona

Post Number: 643
Registered: 1-2005
Posted From: 184.88.99.113


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Posted on Wednesday, March 30, 2011 - 9:04 pm:   

Would these work ????

http://www.surpluscenter.com/item.asp?item=11-2418&catname=electric

or

http://www.surpluscenter.com/item.asp?item=11-3121&catname=electric
FAST FRED (Fast_fred)
Registered Member
Username: Fast_fred

Post Number: 1495
Registered: 10-2006
Posted From: 69.19.14.32


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Posted on Thursday, March 31, 2011 - 6:01 am:   

As I remember the relays were all 120V at least 15A rated (20A?) and used 120v to pull the coil.

They were configured when sold as NO (normally open) but a simple parts flop and they could be configured as NC (normally closed).

This way they were ideal as something like the HW heater could be on as long as it desired EXCEPT if the control wire from the fridge compressor became hot., then the relay would open, shedding the HW heater load.

Scanning the Archives it seems the article was in Pete's archive for a short time.

FF
Pete/RTS Daytona (Pete_rtsdaytona)
Registered Member
Username: Pete_rtsdaytona

Post Number: 646
Registered: 1-2005
Posted From: 184.88.99.113


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Posted on Monday, April 04, 2011 - 4:44 pm:   

could they be --> Potter-Brumfeld PRD11dy0-110

http://cgi.ebay.com/POTTER-BRUMFIELD-PRD-11DY0-110-NSFP-PRD11DY0110-/230550762461

http://www.onlinecomponents.com/pb-tyco_prd-11dy0-110.html?p=12111005
FAST FRED (Fast_fred)
Registered Member
Username: Fast_fred

Post Number: 1500
Registered: 10-2006
Posted From: 66.82.9.81


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Posted on Tuesday, April 05, 2011 - 7:04 am:   

Thanks Pete ,

I looked at the spec sheet and I can't find out if they can be set to NC (normally closed) to open when a signal is sent.

This is required for Load Shedding to work.

Current cap is fine , as is the price.

FF
Pete/RTS Daytona (Pete_rtsdaytona)
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Username: Pete_rtsdaytona

Post Number: 647
Registered: 1-2005
Posted From: 184.88.99.113


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Posted on Tuesday, April 05, 2011 - 8:40 am:   

Fred

These are DPDP - so there are 2 sets of BOTH N/O and N/C contacts connections

They can be wired either way without fliping contacts
FAST FRED (Fast_fred)
Registered Member
Username: Fast_fred

Post Number: 1501
Registered: 10-2006
Posted From: 69.19.14.32


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Posted on Wednesday, April 06, 2011 - 7:10 am:   

Thanks Pete , that will work!

For those that have not heard of Load Shedding , it is an easy concept.

When in a site that has very limited power power on board AC users are staged.

The HW heater would be in all the time , BUT, when the fridge needs power ,a wire from the fridge motor activates the relay , and the HW heater goes off.

When the fridge finishes , the power to its motor stops , and the relay allow the HW heater to go back on.

It works seamlessly after you set it up.

The possibilities are almost endless.



FF
R.C.Bishop (Chuckllb)
Registered Member
Username: Chuckllb

Post Number: 1480
Registered: 7-2006
Posted From: 97.225.132.115


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Posted on Wednesday, April 06, 2011 - 10:35 am:   

Good stuff folks....thanx for that! :-)
RCB

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