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Old 14th March 2014, 09:21 PM   #1
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Default Mounting toroidal transformers without proper monuting kit

Hi all,

Are I becoming even more paranoid?

I notice people are starting to mount toroidal transformers directly on metal mounting plates/chassis without using the proper mounting kit. I am concerned that the insulation will wear through resulting in a short to the chassis.

Is this a safety issue?

regards
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Old 14th March 2014, 09:26 PM   #2
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It's a wise idea to use neoprene washers to prevent damage to the windings. If the centre of the transformer is potted then you can get away without using them. The washers are only there to protect the windings.
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Old 14th March 2014, 09:43 PM   #3
osscar is offline osscar  Latvia
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I think that the rubber washer helps to reduce vibration also, if any.

sink assembly parts can also be useful in this case
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Old 14th March 2014, 09:52 PM   #4
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Related thread:
Fasteners for transformers?

Dale
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Old 14th March 2014, 09:58 PM   #5
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Quote:
Originally Posted by KatieandDad View Post
It's a wise idea to use neoprene washers to prevent damage to the windings. If the centre of the transformer is potted then you can get away without using them. The washers are only there to protect the windings.
Hi KatieandDad,

Thanks. Personally I always use the neoprene washers, but I am beginning to see people mounting unpotted toroids directly onto metal surfaces. I always cringe but say nothing.

I have noticed that cheap toroids are often supplied without the appropriate mounting kit. These cheap toroids also can have untidy windings that results in a couple of windings becoming the pressure point on the metal mounting surface.

I consider this a major safety issue. What do other's think?

I just want to raise this as a "potential" issue.

regards
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Old 14th March 2014, 10:07 PM   #6
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Quote:
Originally Posted by dchisholm View Post
Related thread:
Fasteners for transformers?

Dale
Thanks Dale,

Yeah, we always point out the shorted turn issue but I have never seen anyone point out mounting directly on a metal surface without a neoprene washer as being a safety issue.

I have been wondering if I was been "overly" concerned as even our safety experts have not raised the issue (well, I have noticed any warnings).

regards
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Old 19th March 2014, 01:32 AM   #7
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Squeeze a pecan sized blob of silicone bathtub caulk onto the mounting surface and spread it out into a circle whose diameter is 1cm larger than the diameter of the toroid. Let it dry 24 hours. How thick is it? How springy is it? If you're worried it's insufficient, apply a second coat and let dry another 24 hours. Now your toroidal transformer rests on a pliable, vibration-absorbing cushion of silicone.
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Old 19th March 2014, 03:39 AM   #8
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Quote:
Originally Posted by Mark Johnson View Post
Squeeze a pecan sized blob of silicone bathtub caulk . . . .
Silastic, like solder and cyanoacrylate adhesive and AWG26 insulated wire, is one of the items found on any electronics workbench worthy of the title. I've used it liberally to improve the mechanical integrity of comparatively large components (e.g., capacitors) mounted on a printed wiring board. Using it as a mounting cushion under a toroidal power transformer is a great idea. It may take a little effort to give it a neat and tidy visual appearance but even a sloppy job will perform the functions we're concerned with here.

Other DIY approaches to creating a mounting washer include:
  • Cutting a circular washer from a piece of neoprene gasket sheeting, purchased at the auto parts store
  • The circular plastic lids found on cans of coffee, salted nuts, margarine, shortening, etc, at the grocery store
  • Circles cut from scrap pieces of short-nap indoor/outdoor carpet (the kind with flexible plastic, rather than foam, backing)
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Old 19th March 2014, 04:28 AM   #9
Bibio is offline Bibio  Scotland
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old cd's and cut up camping mats.
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Old 19th March 2014, 02:19 PM   #10
HeliMan is offline HeliMan  United Kingdom
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Do it properly.. or you'll only do it once!
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