Re: [Phys-l] Step down transformer trouble

["Paul Lulai" <plulai@stanthony.k12.mn.us>]

Second send...
A correction to my description... It is wired directly to a junction box. The transformer is physically attached outside of the junction box. I assume this is to allow it to cool more easily. I've wondered if the heat from the cfl (3" away) could be a factor. It looks like I'm up for another transformer purchase to check that out. 

My apologies to John.  I continue to forget that my phone defaults replies to list groups as a reply to the individual, not a reply to the list.  Sorry you get thus note twice, John.

Paul Lulai
Physics Teacher
St Anthony Village Senior High
3303 33rd Ave 
St Anthony Village MN 55418

(w) 612-706-1146




----- Reply message -----
From: "John Denker" <jsd@av8n.com>
Date: Wed, Jul 6, 2011 10:41 am
Subject: [Phys-l] Step down transformer trouble
To: "Forum for Physics Educators" <phys-l@carnot.physics.buffalo.edu>

On 07/06/2011 02:58 AM, Paul Lulai wrote:
> We can't keep our doorbell stepdown transformer working.  I thought i
> would check this group for thoughts. The transformer drops to 16v.
> That matches the input for our doorbell. The transformer is connected
> to ground and both the black and white house wires (as directed on
> installation instructions).  It is installed onto a standard junction
> box with (which has a cfl attached). I've changed transformers
> multiple times.  I checked the doorbell.  I found no problem, but
> thought a $20 change of bells might so it, so I changed it anyway
> (after the 2nd transformer).

Hmmm.

> It is installed onto a standard junction box

Heat buildup could be a problem.

Usually I've seen those things installed /not/ in a junction box.

If it needs to be in a box, make sure the box has plenty of holes.
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