Yes, rigid covered with a pvc coating.
What we refer to as OCAL (Oh Cal).
Used extensively in Class 1 Div 1 settings. Think oil and gas, flammable,
explosive environments. As well as corrosive (offshore ocean based, boats,
etc).
I //hate// running OCAL John! Having cut my OCAL teeth in land based
oilfields, offshore drill rigs and solar, I've run plenty. Definitely a
triple nickel bender is a best friend!
--Shane
KD6VXI
On Friday, December 13, 2019, john nistico <electric911inc@hotmail.com>
wrote:
> You should use pvc coated rigid conduit in ground or straight pvc conduit.
> Line and low voltage can be run in the same conduit with same voltage rated
> cable. As for tower grounding I prefer the ground halo approach.
>
> Sent from my iPhone
>
> > On Dec 13, 2019, at 5:39 PM, Shane Youhouse <kd6vxi@gmail.com> wrote:
> >
> >
> >>
> >>
> >> Message: 6
> >> Date: Wed, 11 Dec 2019 16:33:53 -0800
> >> From: Jim Brown <jim@audiosystemsgroup.com>
> >> To: towertalk@contesting.com
> >> Subject: Re: [TowerTalk] Special grounding and/or cable routing?
> >> Message-ID:
> >> <0ac881be-ecd5-0a1f-33ff-ffc0250970fd@audiosystemsgroup.com>
> >> Content-Type: text/plain; charset=utf-8; format=flowed
> >>
> >>> On 12/11/2019 5:49 AM, Paul Beckmann wrote:
> >>> I'm writing the reflector members today to get their thoughts on my
> plans
> >>> for coax and cable routing, grounding, and lightning suppression.
> Should
> >>> suppression be installed at the base of the tower before it makes the
> 15'
> >>> underground run? Should the tower ground and garage ground be directly
> >>> interconnected?
> >>
> >> Absolutely yes -- one of the most fundamental rules of grounding and
> >> bonding is that ALL grounds must be bonded together. The only time you
> >> would NOT bond tower ground to other grounds is if it was more than
> >> 60-100 ft from the building housing the shack. I would place arrestors
> >> on a panel near ground level where it enters the garage so that bonding
> >> from that panel (the arrestors) has the shortest practical path to the
> >> earth.
> >>
> >>> If so, should the ground be placed inside or outside the
> >>> coax and rotator cable conduit?
> >>
> >> In general, it's good practice to route all cables together. This would
> >> be a great application for steel conduit (EMT) if it's practical to
> >> install it. Bond it to ground at both ends, and it shields the wiring
> >> AND acts as a very robust bonding conductor. It is NOT, however,
> >> permitted to run power and low voltage wiring in the same conduit, and
> >> equipment grounding conductors associated with power (the Green Wire)
> >> MUST be run in the same conduit with power conductors.
> >
> >
> > This is not true. So long as all cables have a rating equal to the
> highest
> > voltage encountered you can bundle all cables in the same raceway. Even
> > ether net can be purchased with 600VAC insulation ratings. Along with
> most
> > other style of wire.
> >
> > We currently use 0 to 10v dimmers and they have both the 0 to 10 and the
> > 120 to 277 volt based 'mains' wires in the same metal clad spiral
> conduit.
> > This meets BOTH UL and at least back to 2011 NEC.
> >
> > It is a common myth that they can't all be in the same raceway. But that
> > doesn't make it right.
> >
> > Also, he has both underground and above ground runs. You don't use EMT
> in
> > the ground. You SHOULD use it above ground, along with what is called
> BOND
> > BUSHINGS on both ends. This will keep everything at the dame rf and DC
> > potential, as well as provide some shielding.
> >
> > If you want to use metal conduit in the ground, use rigid pipe along
> with a
> > good installation of plastic tape. Not normal electric tape, but what
> > electricians refer to as pipe wrap. I don't. I use schedule 40 pvc
> > underground and then transistor to metal pipe when it comes above ground
> > for any appreciable length.
> >
> > Also you must have a sheathed ground to pull into your conduit. You may
> > not use bare ground wire inside a raceway with sheathed wires. Reason
> > being the bare copper will (can) abraxe the insulation, especially when
> > being installed and / or pulled in. Some AHJ (authorities having
> > jurisdiction may argue this, but it is code where I work in California).
> >
> >
> > These statements will ring true to current NEC guidelines, California
> > Electric Code and my local AHJ)
> >
> >
> > --Shane
> > KD6VXI
> > _______________________________________________
> >
> >
> >
> > _______________________________________________
> > TowerTalk mailing list
> > TowerTalk@contesting.com
> > http://lists.contesting.com/mailman/listinfo/towertalk
>
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