> Underwriters Laboratories is testing an ITE product for me that uses a
> three terminal 400V gas tube between tip, earth and ring of the telecom
> connection. They have failed the NAC M1 test (600V, 40A, 1.5sec) because
> the 2 amp fuse used in the wiring simulator (figure NAC.2 in UL1950 3rd
> page 239) opened during the test.
>
> The gas tube would look pretty much like a short circuit once it starts to
> conduct, and I would expect the Buss MDL2 fuse they used to blow. Their
> failure criteria would seem to exclude the use of gas tubes directly
> across the tip and ring lines. Is this a proper assumption?
>
> I would appreciate any thoughts on this situation.
>
> Jim Lyons
>
> James W. Lyons
> Manager - Product Compliance
> GTECH Corp.
> 55 Technology Way
> West Greenwich, RI 02817
> Tel (401) 392-7723
> Fax (401) 392-4955
> Email [email protected]
>
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