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From: "Michael A. Terrell"
Subject: Re: LED Ballast
Date: Tue, 31 Dec 2002 15:30:28 -0500
Organization: Have you seen my bench? No, really! Where is it?
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Spehro Pefhany wrote:
> On Tue, 31 Dec 2002 15:17:17 GMT, the renowned "Da Man"
> >Use a fuseable resistor. Two parts in one! I wonder if they are avalible in
> >UL / CSA / CE approved versions for 120 / 220 V AC?
> The safety issue is one of electrocution of the user, and the only
> viable solution is proper insulation. It would be nice if the
> insulation allowed the light through as well.
> Fusible resistors don't seem to carry approvals. I don't know why,
> perhaps they are not considered "safety" related but are typically
> used to prevent further destruction. Maybe JW knows?
> Best regards,
> Spehro Pefhany
> "it's the network..." "The Journey is the reward"
> email@example.com Info for manufacturers: http://www.trexon.com
> Embedded software/hardware/analog Info for designers: http://www.speff.com
I have seen blown fusible resistors that went from a few ohm up to a
few thousand when it fused. There was enough metalization inside the
insulation to conduct, but not enough to operate the equipment. I have
also seen A-B carbon comp resistors used as a fuse, and one lead was
soldered to a flat plated brass spring to pull it apart when it failed.
(Motorola color TV sets, late '60s)
Michael A. Terrell
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