[weewx-user] Re: safety of wind instruments on metal pole on roof?
I decided to use PVC pipe, about 50mm dia. extending 2.5m above the roof line. Lighter to handle and not too flexible. The cable is easily run down the middle, to the wireless transmitter, which is mounted on a wooden pole. I don't know if it would make much difference in enticing lightning to strike, but as Karen said once the ionized path is created no vapourization of the wire is going to stop it. Neighbours of my mother had a bit of electronic kit attached to their back wall with a small wire running upwards - I forget the details. The wire vapourized all right, but not without scattering bits of circuit board and components all over their yard. Luckily, no fire resulted. There are plenty of high gum trees nearby, and TV aerials with metal masts protruding from the roof. On Tuesday, 18 January 2022 at 6:03:47 am UTC+10 morr...@gmail.com wrote: > Not strictly weewx related, but: > > Any safety concerns with mounting my wind speed and direction instruments > on a 1.25" galvanized steel pole, 6 feet above the roof line? > > I currently have a prototype anemometer about 20 feet in the air. It's > well away from our house so solar powered, which is proving a challenge. > > We get a bit of lightning here, but there are tall trees near our house, > and I've never heard of a direct hit in the neighborhood. > > Thanks for any experience/anecdotes. > -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to weewx-user+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/40f6017c-adc9-4915-84ce-62262c9b1d8an%40googlegroups.com.
[weewx-user] Re: safety of wind instruments on metal pole on roof?
There are people who lost their electronic equipment in the house including radio, tv set etc. because of a little bit of lightning near their house. Trees are not exactly lightning rods. I would strongly suggest to ground the pole using a round steel of about 1/3" (about 10mm). There should be some grounding point in your house, where you can connect that round steel to. You must not use electric wire for that. And I strongly recommend to place that outside your house at the wall. In case there is no such thing as a grounding point, you need a bar of stainless steel, again about 1/3" (about 10mm) and at least 18 feet in length. The whole thing you drive into the earth. The upper end that looks out of the earth you can connect to instrument pole. As 18 feet are very long, bars of about 3 feet are provided including a thread at the end to connect one to the other. And there are special devices to drive the bar into the earth by vibration. morr...@gmail.com schrieb am Montag, 17. Januar 2022 um 21:03:47 UTC+1: > Not strictly weewx related, but: > > Any safety concerns with mounting my wind speed and direction instruments > on a 1.25" galvanized steel pole, 6 feet above the roof line? > > I currently have a prototype anemometer about 20 feet in the air. It's > well away from our house so solar powered, which is proving a challenge. > > We get a bit of lightning here, but there are tall trees near our house, > and I've never heard of a direct hit in the neighborhood. > > Thanks for any experience/anecdotes. > -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to weewx-user+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/833d9e57-462c-4bbe-8509-f7ad947957e4n%40googlegroups.com.
