LX 200 GPS 14in. Mallincam Extreme , Northhills Observatory
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Quote:The 240V, conduit, 18" burial, heavy gauge, permanent connection is how I went with my latest observatory. About 80' run through a crawl space and then about 70' underground. 170' of #3/#3/#3/#8 TWWN cable set me back $500. About $200 in PVC conduit and fittings. $100 for the sub-panel and breakers. $150 for the trencher rental. So, just under a grand. I got an electrician to quote the job as well and they wanted $1700 and they would have used smaller aluminum wire.
Scopes - 10" Meade LX200, Coronado 90mm, Vixen ED103, Orion 80mm Guide Mount - AP1600GTO Std (Encoders.... someday) Cameras - Atik 320E, Atik 314L+, Atik Titan, Mallincam Xtreme X2, Skyris 274M, Orion StarShooter, Canon 7D Instruments - L200 Spectrometer (300,600,1200 gratings), SA100 Diffraction Filters - LRGB,OIII,SII,Ha; J/C UV,B,V,Ic,Rc Way too many computers....
Quote:Now what needs to be seen is the lighting protection I'm having put in. That is impressive. My property is quite high on the top of a hill and we get a lot of lighting especially now during monsoon season here in Az.
Quote:Quote:The 240V, conduit, 18" burial, heavy gauge, permanent connection is how I went with my latest observatory. About 80' run through a crawl space and then about 70' underground. 170' of #3/#3/#3/#8 TWWN cable set me back $500. About $200 in PVC conduit and fittings. $100 for the sub-panel and breakers. $150 for the trencher rental. So, just under a grand. I got an electrician to quote the job as well and they wanted $1700 and they would have used smaller aluminum wire. I'm surprised your electrical code let you do that. Where I live, a 240V circuit to an outbuilding requires a complete separate earth ground. This means multiple 8' ground rods, preferably driven vertically into the ground, connected using welded electrical connectors. I do all of my own house wiring (with a 100% pass rate on inspections) and decided that that wasn't a job for me and went with a 110 circuit to the garage which didn't require the grounding system.Phil
Quote:Watch what your codes are in the area. In my area burying soow cord is a no no. And the 12" sounds too shallow to be up to code.. Hire a electrican have him install a sub panel in your observatory. Do it once and do it right. I now alot of people like to do diy jobs. But they don't understand the difference between grounding and bonding. Better to be safe.
Quote:Jason, You did the 240V yourself? SD is actually a fairly lenient state when it comes to electrical code. I'm allowed to do it myself and have it inspected by an electrical inspector. The biggest problem I have is knowing how the connection into the electrical box will go. I feel confident I could wire it up from the shed to the panel; I don't feel confident at that point .Thanks for a great review of what you've done. That's exactly what I was hoping for.Tad, I'm hoping for a more permanent solution that gets me away from using an extension cord. Chris
Quote:I had a certified electrician run a 50Amp service to my observatory. The distance was about 75'. Code in Navajo County is that a subpanel is grounded at the source NOT at the subpanel. That is to say, at the subpanel there is no connection between ground and neutral. This prevents ground loops. I wired the inside of the observatory, which in my case, was fairly simple. I ran the larger service (it could actually supply 60Amp if I changed the main breaker) as the difference in price was small and I figured it's cheaper to overestimate now rather than run short in the long run. It cost just about $600 if I remember correctly. The ditch and conduit was already in for 2/3rd's the distance. The other part ran under my deck on my house, which the electrician supplied. In my case, he did a first class job.
Quote:rimcrazy, anything you're willing to share about your lightning protection install would be very welcome by me, either here or in a separate thread. Thanks.Quote:Now what needs to be seen is the lighting protection I'm having put in. That is impressive. My property is quite high on the top of a hill and we get a lot of lighting especially now during monsoon season here in Az.
Jeff D Orion 8" F4 Astrograph Celestron 80mm Guide-scope Celestron CGEM Mount Celestron Nexguide Canon EOS Rebel T1i (Unmodified) With MPCC Canon EOS Rebel XSi Full Spectrum Gary Honis Modified Skywatcher 12" Collapsible Dobsonian Coulter Odyssey 2 8" Dobsonian Celestron Nexstar 102SLT Celestron Skymaster 15x70 http://flic.kr/ps/ncfpL
Quote:Jeff, My understanding was that you're not supposed to put direct burial cable (sheathed) in a conduit due to the potential for it to corrode quicker. That could be our NEC versus your own rules.Anyways, electrican came out and quote me about 200 bucks to hook up a separate 20A service off my house's breaker with a disconnect (as required by code) in the shed. He didn't want to do the trenching, so I'm going to bury the cable for him (12").I guess my only question now is whether a trencher is easier than a vibratory plow. Anyone have any advice on that?Thanks,Chris
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