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Installing a current transformer in a 30/50 amp system [message #237865]

Tue, 28 January 2014 20:20

Matt Colie

Messages: 8547
Registered: March 2007
Location: S.E. Michigan

Karma:

Senior Member

Ok Ken, Ken or other.

I am not a EE, but I have been involved in all sorts of things that exist on ships and elsewhere. I was following Rob's thread and thinking that might be handy at the price of the unit that KenH picked.

Problem:

Our stock coaches are wired as 3-wire 240 for 50 (40) Amp. I started out thinking of a trick I did a long time a go where to measure both sides of a 3-wire supply and get the sum of the two, I put the feed lines through the current transformer in opposite directions. This did give us the sum of current going into two 120 heaters.
I was thinking (dangerous, I know) that the same trick could work for us.....
But - - On the APU or most campgrounds we are just 2-wire 120 for 30 Amp.

Then I turned the thinking to the 30 Amp case. OOPS......
If I am not mistaken, it would always read Zero.....

Now, I have never had an AC supply overload issue, so this may be a complete waste of personal processor time. But does anybody have an idea how to get one CT and display to do anything worthwhile in our case.

The only answer I see is buy two (2) and mentally add the numbers for 30 or watch for 50 maximum whichever is appropriate at that time.

Matt

Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit

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[Message index]

		Installing a current transformer in a 30/50 amp system By: Matt Colie on Tue, 28 January 2014 20:20
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: USAussie on Tue, 28 January 2014 21:39
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: Ken Burton on Tue, 28 January 2014 22:35
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: Ken Henderson on Tue, 28 January 2014 23:09
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: USAussie on Wed, 29 January 2014 00:29
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: Ken Burton on Wed, 29 January 2014 00:34
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: Ken Burton on Wed, 29 January 2014 08:27
		Re: Installing a current transformer in a 30/50 amp system By: Ken Burton on Tue, 28 January 2014 23:48
		Re: Installing a current transformer in a 30/50 amp system By: SeanKidd on Wed, 29 January 2014 06:29
		Re: Installing a current transformer in a 30/50 amp system By: Matt Colie on Wed, 29 January 2014 10:15
		Re: Installing a current transformer in a 30/50 amp system By: Ken Burton on Wed, 29 January 2014 10:37
		Re: Installing a current transformer in a 30/50 amp system By: cadelec on Wed, 29 January 2014 15:48
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: k2gkk on Wed, 29 January 2014 16:24
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: A Hamilto on Wed, 29 January 2014 19:12
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: Ken Burton on Wed, 29 January 2014 21:50
		Re: Installing a current transformer in a 30/50 amp system By: A Hamilto on Wed, 29 January 2014 19:26
		Re: Installing a current transformer in a 30/50 amp system By: Matt Colie on Wed, 29 January 2014 19:31
		Re: Installing a current transformer in a 30/50 amp system By: cadelec on Wed, 29 January 2014 20:04
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: Ken Henderson on Wed, 29 January 2014 21:39
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: cadelec on Wed, 29 January 2014 22:29
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: Ken Burton on Thu, 30 January 2014 00:05
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: cadelec on Thu, 30 January 2014 01:54
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: Ken Burton on Thu, 30 January 2014 03:41
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: cadelec on Thu, 30 January 2014 04:29
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: A Hamilto on Thu, 30 January 2014 11:55
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: USAussie on Thu, 30 January 2014 15:56
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: k2gkk on Thu, 30 January 2014 16:39
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: Matt Colie on Fri, 31 January 2014 06:56
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: k2gkk on Fri, 31 January 2014 08:07
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: Matt Colie on Fri, 31 January 2014 09:52
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: cadelec on Fri, 31 January 2014 21:20
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: k2gkk on Fri, 31 January 2014 21:52
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: cadelec on Sat, 01 February 2014 01:15
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: Ken Burton on Sat, 01 February 2014 05:18
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: USAussie on Sat, 01 February 2014 19:05
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: GMC_LES on Mon, 03 February 2014 19:25
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: USAussie on Mon, 03 February 2014 21:27
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: GMC_LES on Mon, 03 February 2014 22:18
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: USAussie on Mon, 03 February 2014 23:09
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: GMC_LES on Tue, 04 February 2014 08:26
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: USAussie on Tue, 04 February 2014 16:09
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: USAussie on Thu, 13 February 2014 16:14
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: GMC_LES on Thu, 13 February 2014 18:35
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: Matt Colie on Fri, 14 February 2014 07:51
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: GMC_LES on Fri, 04 April 2014 21:54
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: Guy Lopes on Sat, 05 April 2014 01:31
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: GMC.LES on Sat, 05 April 2014 11:52
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: Guy Lopes on Sat, 05 April 2014 12:37
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: USAussie on Sat, 05 April 2014 16:40
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: Ken Henderson on Sat, 01 February 2014 08:11
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: A Hamilto on Sat, 01 February 2014 10:44
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: Ken Henderson on Sat, 01 February 2014 11:54
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: USAussie on Sat, 01 February 2014 16:02
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: Ken Burton on Sat, 01 February 2014 23:54
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: USAussie on Sun, 02 February 2014 00:06
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: Ken Burton on Sun, 02 February 2014 01:34
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: jhbridges on Mon, 03 February 2014 10:09
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: Ronald Pottol on Mon, 03 February 2014 11:08
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: James Hupy on Mon, 03 February 2014 11:24
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: k2gkk on Mon, 03 February 2014 16:10
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: jhbridges on Tue, 04 February 2014 06:18
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: A Hamilto on Thu, 30 January 2014 19:10
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: USAussie on Thu, 30 January 2014 20:44
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: cadelec on Thu, 30 January 2014 21:00
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: USAussie on Thu, 30 January 2014 21:17
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: Ken Burton on Thu, 30 January 2014 23:24
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: A Hamilto on Thu, 30 January 2014 23:46
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: Ken Burton on Fri, 31 January 2014 00:44
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: cadelec on Fri, 31 January 2014 03:16
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: Ken Burton on Fri, 31 January 2014 03:27
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: USAussie on Fri, 31 January 2014 06:43
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: Ken Burton on Fri, 31 January 2014 23:35
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: cadelec on Sat, 01 February 2014 01:18
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: Ken Henderson on Thu, 30 January 2014 07:37
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: Ken Burton on Thu, 30 January 2014 17:34
		Re: Installing a current transformer in a 30/50 amp system By: SeanKidd on Wed, 29 January 2014 16:49
		Re: Installing a current transformer in a 30/50 amp system By: zhagrieb on Wed, 29 January 2014 20:25
		Re: Installing a current transformer in a 30/50 amp system By: JohnL455 on Mon, 03 February 2014 10:27
		Re: [GMCnet] Installing a current transformer in a 30/50 amp system By: GMC_LES on Tue, 04 February 2014 09:08
		Re: Installing a current transformer in a 30/50 amp system By: kingd on Mon, 03 February 2014 12:56
		Re: Installing a current transformer in a 30/50 amp system By: Ken Burton on Mon, 03 February 2014 13:25
		Re: Installing a current transformer in a 30/50 amp system By: Matt Colie on Mon, 03 February 2014 20:12
		Re: Installing a current transformer in a 30/50 amp system By: kingd on Thu, 06 February 2014 12:53
		Re: Installing a current transformer in a 30/50 amp system By: Ken Burton on Thu, 06 February 2014 14:47

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