Re: BIL (II)
On Tue, 4 Jun 1996 22:25:05 -0600, Tesla List
<tesla-at-poodle.pupman-dot-com>, you wrote:
>>From pierson-at-msd26.enet.dec-dot-comTue Jun 4 21:11:19 1996
>Date: Tue, 4 Jun 96 13:16:18 EDT
>From: THIS SPACE LEFT BLANK <pierson-at-msd26.enet.dec-dot-com>
>ANYWAY, i can put in the tables, if interested, sample:
>kV (working BIL (kv) Clearance to
> ground phase 'people' roadways
>7.5KV 95 6" 7" 8 ft 20 ft
>Now i will ASSume everyone on this list understands that 7.5 KV sparkover is
>A LOT less than 6" <grins>, with the 6" providing working margin for
>95 KV surges, lightning, or other...
But I do question their 8' gap for 'people' and 20' for roadways. Is
the road more sensitive to a lightning strike than a person?;)
It also explains why "pole pigs" stand up to TC usage so well: they
are built for a 12 times over-voltage without damage. The poor neon,
is built for a few seconds of 15kV and then years at (about) 1kV!
p.s. I've got a Westinghouse 10+ ll-65 pig. About 7.2kV to 220V center
taped. Any listing for it's BIL?