RE: What wattage resistors for NST protection?

• To: tesla-at-pupman-dot-com
• Subject: RE: What wattage resistors for NST protection?
• From: "Lau, Gary" <Gary.Lau-at-compaq-dot-com> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Thu, 17 Feb 2000 08:15:06 -0700
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Aluminum-clad power resistors are NOT suitable for use in NST protection
networks.  Since they are required to develop tens of kV from end-to-end,
the aluminum heat sinks will seriously compromise their voltage holdoff
capability.  All-ceramic units of sufficient wattage should not have this
problem.

Gary Lau
Waltham, MA USA

>A quick warning about grossly overrunning resistors - I have seen the
>end seals of one of the (usually) gold-coloured aluminium clad power
>resistors disintegrate with considerable speed and an alarming BANG
>when severely overstressed. ceramic types could also possibly shatter.
>be careful!

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