[Clayart] coil life

David Woof woofpots at hotmail.com
Sat Apr 23 06:43:49 UTC 2022

Arnold said: "One thing electricians have in common: their connections are very tight."

Yes! a connection that is not tight causes some of the electrical current to "arc" across the micro gap between the loose faces of the metal connection. This arcing causes a build-up of carbon further reducing the current energy's ability to flow.  Of course, this wreaks havoc on the sensitive function(s) of the various kiln components.

Cause of many studio fires is when a kiln is "plugged in" to an outlet, rather than "hard wired" in with a functioning circuit breaker and manual switch in the system.    (Hard wired and soldered is the ultimate tight connection where extreme heat is not a concern.)

If one must use a plug-in power supply, It's an "advisable" "must" to on a regular maintenance schedule, un plug from the outlet receptacle and clean/shine the male tangs of the plug with emery paper to remove any carbon arcing that may have occurred.

I know this is preaching to the Choir who already know this, while the congregation sits in a malaise of denial and abject dis belief, and will most likely do nothing but say: "B.S. I've had no fires in 50 years bla bla....."   But we keep beating these drums just the same.

Bon feu comrades,
From: Clayart <clayart-bounces at lists.clayartworld.com> on behalf of Arnold Howard <arnoldhoward at gmail.com>
Sent: Thursday, April 21, 2022 6:02 AM
To: Clayart international pottery discussion forum <clayart at lists.clayartworld.com>
Subject: Re: [Clayart] coil life

Yes, finger-tight torque. That’s especially common on the thermocouple oval connection block. Most replacement thermocouples have loose screws.

I’ve been delivering new 12-sided kilns to schools, which entails taking the kiln sections apart to move them through 36” doorways. While I’m at it, I check the connections to make sure they’re tight, and I rearrange the thermocouple wires if they’re too close to relay wires in the switch boxes.

I’ve noticed lately that the push-on terminals on new kilns aren’t as tight as the older push-on terminals. (I have to remove wires to separate the kiln sections. That’s why I know how tight the terminals are.)

The push-on terminals should be so tight that they’re difficult to remove.

One thing electricians have in common: their connections are very tight.

Arnold Howard

Sent from my iPhone

> On Apr 8, 2022, at 7:33 AM, mel jacobson <melpots at mail.com> wrote:
> Look at some of the pictures that Arnold is posting on facebook from his kiln repair
> business.  wires connected with finger tight torque. black and melted. Coils with
> melted glaze on them. Thin wires with small spade connectors...melted. Kilns sitting outside
> under a small roof. Open the control box and it is all green vegetation.
> Remember, Arnold was the author of 32 pages in our kiln book...repair and maintenance of an
> electric kiln. the book is free of charge.
> mel
> website: www.melpots.com<http://www.melpots.com>
> www.melpots.com/CLAYART.HTML<http://www.melpots.com/CLAYART.HTML>
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