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December 1998

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Thu, 10 Dec 1998 00:16:18 -0800
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I know nothing of the process for a board house to gain UL approval.
I can tell you alot about UL approvals from an OEM point of view.

One of the criteria that UL approves all sorts of electronic devices
is to restrict the size of holes in the bottom covers of products.
If you need to violate the hole restriction with larger holes for
say more air flow, UL allows you to provided a UL 94V-0 rated pc
board is immediately over to hole or holes.

Other areas that require UL 94V-0 rated boards is through customer
contracts especially with the telcos.  Some years back a central
switching office for a major telco in the Chicago area burned down
shutting service down for quite a while. They all have since become
very sensitive to flammability issues.  In some cases, they demand
the OEM to go above and beyond what the standards require.

It's rather humbling to sit across the table from a major telco
customer trying to cut costs as best you can, only to be told to
do so could jeopardize your own 911 call. They take this very
seriously and they do not back down from it.

The standards by which mfrs are required to make boards in my
humble opinion are fairly robust.  I've never had any problems
over the past 17 years. When you require a certain flame rating
for a board, you don't have to second guess it.

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