When the conduit was installed in the mast of my 38, we used long sections of thin wall PVC electrical conduit. The mast was down and laid with the front of the mast on the bottom, then the spreaders were blocked up to make the front curve of the mast the lowest point on the interior.
Put a healthy bead of 5200 along the layline of the conduit (to make sure it was straight), inserted the conduit with the adhesive on to, and then rolled it over to get the adhesive between the conduit and the inner surface of the mast. After the adhesive had cured, we drilled a series of holes through mast & conduit and secured permanently with short pop rivets. Then drilled the conduit where the wires the spreader light, masthead (steaming) light, and foredeck light came through the mast. We used an electrician’s fish to run the wires through the conduit. The only “deficiency” I see was the inability to put pop rivets in to hold the conduit for the section of mast to which the track for the spin pole is attached. But that hasn’t been a problem in the 12 years or so that the conduit has been in place. BTW, I used the 3-zip-tie technique to quiet the mast of my 25 when I replaced the mast and rewired about 15 years ago. That was much easier, and just as effective as far as I can see. Rick Brass Imzadi C&C 38 mk2 #47 la Belle Aurore C&C 25 mk1 #225 Washington, NC From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Nathan Post via CnC-List Sent: Thursday, April 9, 2020 8:11 AM To: cnc-list@cnc-list.com Cc: Nathan Post <nathan8...@gmail.com> Subject: Re: Stus-List securing cables in mast David, I haven't tried it yet but am leaning in that direction. The strategies I have seen discussed on other forums involve assembling the conduit first (gluing the sections together with a messenger line through it) and either sliding it into the mast and then drilling and using blind rivets to attach it. Some say to drill an extra hold to use a wire hook and hold the conduit in place while drilling and riveting. It also seems possible that the conduit will be stiff enough to stay in place for the next rivet once the first two are done but I guess that remains to be seen when I try it. If I need to drill the extra hole then I will just put a rivet in it afterwards to plug it. The alternative I have seen proposed is to put a bead of 3M 4200 or sikaflex on the top of the conduit as you slide it in the mast and then rotate the tube so that the adhesive contacts the mast and bonds in place. Not sure how good a bond quality you could get and it would not be good if it came loose so I don't think I will do that. Also leaves a good chance of getting halyards and the like stuck. There are definitely some advantages over loose wires in the mast (which bang around) and a zip tie bundle which creates potential issues with tangling the halyards in various ways. If I didn't have so many internal halyards I would be less concerned about that. I also want to be able to run the cables from top to bottom since I have some larger connectors that came pre-installed and don't really want to have to cut those off or make bigger holes in the mast for them. So that is the plan at this point. Tasks are to figure out how large a conduit will fit and what wall thickness to get - then to get appropriate conduit and rivets and a messenger line to move forward. Nathan ~~~ Nathan Post S/V Wisper 1981 C&C 34 CB Lynn, MA On Thu, Apr 9, 2020 at 7:31 AM David Risch via CnC-List <cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com> > wrote: So let me understand this...folks have installed conduit for the length of the mast inside the mast...? Thought of that but abandoned due to complexity or did I overthink? Sent from my Android. Please forgive typos. Thank you. _____ From: CnC-List <cnc-list-boun...@cnc-list.com <mailto:cnc-list-boun...@cnc-list.com> > on behalf of Shawn Wright via CnC-List <cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com> > Sent: Wednesday, April 8, 2020 11:22:38 PM To: cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com> <cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com> > Cc: Shawn Wright <shawngwri...@gmail.com <mailto:shawngwri...@gmail.com> > Subject: Re: Stus-List securing cables in mast I used CL200 for our irrigation system, as it was about half the price of CSA/UL approved schedule 40. It is definitely thinner, which in this case is a bonus. For water pipes, not so much, but I have >1000' in the ground and no leaks after the 10 years, except for those pipes I've hit with something. In my experience, schedule 40 has much higher strength and impact resistance, and schedule 80 even more so, but it's not an issue inside the mast. For making a support for a winter cover, I'd use sched 40. -- Shawn Wright shawngwri...@gmail.com <mailto:shawngwri...@gmail.com> S/V Callisto, 1974 C&C 35 https://www.facebook.com/SVCallisto On Wed, Apr 8, 2020 at 9:06 AM Josh Muckley via CnC-List <cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com> > wrote: Yeah that CL 200 is the pvc which I have for reference. When I pulled the upc off the side it came up as scheduled 40. I don't know the difference. I've never really had to research pvc pipe so I'm a little out of my element. Josh On Wed, Apr 8, 2020, 11:27 Shawn Wright via CnC-List <cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com> > wrote: I had hoped to pull our mast soon, but with the mast crane out of service due to covid, it will have to wait. Some great info on this thread, so I will save it. One option for thinner PVC is to use white (water) PVC, which you can get in a CL200 rating (at least in Canada) for light use; it is a bit thinner walled, and UV resistance is not an issue inside the mast. You could also seek out aluminum electrical conduit, which will be even thinner. Regarding sizing, I just installed two 3/4" conduits (grey electrical type) through the bilge for wiring, and was able to get the wiring for both Garmin and Standard horizon depth sounders through one conduit by staggering the connectors - two 7 pin DIN twist lock, and one RCA for the old SH unit. Once the connectors are through, there is plenty of space for smaller cables. Holding the conduit in place while drilling and riveting might be challenge also. Too bad the mast doesn't have a wire track like some of the newer ones. -- Shawn Wright shawngwri...@gmail.com <mailto:shawngwri...@gmail.com> S/V Callisto, 1974 C&C 35 https://www.facebook.com/SVCallisto On Tue, Apr 7, 2020 at 3:30 PM Nathan Post via CnC-List <cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com> > wrote: All, As one of my boat projects this spring I am replacing the electrical wiring in my mast. The mast is currently down (horizontal) so now is the time to do it. I want to secure the wires in the mast, in particular to reduce noise (when rocking at anchor). Wisper is a 1981 C&C 34 with a keel stepped mast and 5 internal halyards in addition to the wires. The cables are for wind instruments, masthead and steaming lights, VHF coax, and radar (power and communication) so it will be a substantial bundle with a separate drop at the spreader. The two approaches I am considering are: 1) Creating a bundle (wiring harness) of the cables and placing 3 large cable ties on the bundle at perhaps 2 or 3 foot intervals with the tails sticking out at 120 deg angles that will bend over and press against the mast and keep the cables in the middle. I would use Panduit metal barb outdoor zip ties which are robust, smooth edged, and long lasting. 2) Installing a PVC conduit (using rivets?) with a feeder line for the cables and then running the cables through it. There is support of both methods in various forums online. Cable ties are definitely the simpler method. The main advantages to the conduit that I see is being able to run an additional wire through it at a later time potentially with the mast up. Also I might be able to run cables from top to bottom so that a large connector can remain preinstalled on the top (for example for the radar unit) rather than needing to feed everything in to the bottom at once and then fishing the ends out the various small holes in the mast and reattaching connectors. The disadvantage is the effort required to install it and the additional holes I would need to create in the mast. I am also unsure how quiet either solution would be and the relative chance of tangling or extra friction or wear on a halyard although most info on-line seems to indicate that the conduit is the better choice for that. With the conduit approach, I am also debating if two smaller conduits - one to the spreader and one to the mast head - would make more sense than having a hole in large conduit at the spreader location. Has anyone done either of these securing approaches? What are your thoughts on the success? How much does it silence the cables? Is the effort for the conduit worth it? Thanks, Nathan Post S/V Wisper 1981 C&C 34 CB Lynn MA, USA _______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray _______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray _______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray _______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray
_______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray
