Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.




76 posts

Master Geek
+1 received by user: 6


Topic # 247800 23-Feb-2019 20:37
Send private message quote this post

Hi,

 

I'm doing some building work and have a trench open and our street is getting fibre in a few months.

 

I plan to get chorus in to lay their green cable.  I've a couple of meters of trench to dig to get from the existing trench to the front corner where the fibre will come in. 

 

This involves a 90 degree bend, which i understand should be a sweeping bend, but I'm having great difficulty figuring out the exact dimensions of this 900mm sweeping 90 degree bend so that I can dig an appropriate trench.  Anyone know?

 

 

 

Thanks,
Dan.


Filter this topic showing only the reply marked as answer View this topic in a long page with up to 500 replies per page Create new topic
 1 | 2
697 posts

Ultimate Geek
+1 received by user: 86

Lifetime subscriber

448 posts

Ultimate Geek
+1 received by user: 168

Subscriber

  Reply # 2186086 23-Feb-2019 22:06
2 people support this post
Send private message quote this post

I would have thought a 900mm sweeping bend would have a radius of 900mm?


 
 
 
 




76 posts

Master Geek
+1 received by user: 6


  Reply # 2186087 23-Feb-2019 22:30
Send private message quote this post


76 posts

Master Geek
+1 received by user: 6


  Reply # 2186088 23-Feb-2019 22:31
Send private message quote this post

djtOtago:

 

I would have thought a 900mm sweeping bend would have a radius of 900mm?

 

 

Or 900mm could be the length of the pipe?


697 posts

Ultimate Geek
+1 received by user: 86

Lifetime subscriber

  Reply # 2186089 23-Feb-2019 22:38
Send private message quote this post

Make sure the street fibre ducts are going to meet up with your trench.





Gordy




76 posts

Master Geek
+1 received by user: 6


  Reply # 2186091 23-Feb-2019 22:47
Send private message quote this post

Gordy7:

 

Make sure the street fibre ducts are going to meet up with your trench.

 

 

 

 

Yeah thanks, I did manage to get through to someone at chorus who could confirm where they planned to feed my property from.


8214 posts

Uber Geek
+1 received by user: 2783

Lifetime subscriber

  Reply # 2186142 24-Feb-2019 07:40
One person supports this post
Send private message quote this post

i don't think chorus will lay your conduit anymore, you will likely have to get it and lay it yourself (you may be able to get it from them though)


190 posts

Master Geek
+1 received by user: 43


  Reply # 2186163 24-Feb-2019 09:33
Send private message quote this post

A couple months ago, I put in a trench for fibre and grabbed some green telecoms conduit from Stewarts with a couple of 90deg sweeping bends. There was only one 90deg bend available and that was it.

I had to supply all materials, dig the trench from the boundary and get a contractor in to bore 3m under under a concrete path because Chrous's solution was unacceptable.

1546 posts

Uber Geek
+1 received by user: 362

Lifetime subscriber

  Reply # 2186165 24-Feb-2019 09:41
Send private message quote this post

Isn't this just maths?

 

 

 

arc length = radius * central angle in radians

 

so radius = arc length / central angle in radians

 

 

 

Convert central angle to radians :

 

90 degrees = pi/2 = 1.5708

 

 

 

so radius will = arc length / 1.5708 

 

900 / 1.5708 = 572.96

 

 

 

so close enough to 573mm





Life is too short to remove USB safely.


448 posts

Ultimate Geek
+1 received by user: 168

Subscriber

  Reply # 2186219 24-Feb-2019 10:42
Send private message quote this post

Yes, simple maths.

 

The real question is.
What does Chorus mean by "A 900mm sweeping bend"

 

A) A bend that has a radius of 900mm.

 

B) A 90 deg bend with a length of 900mm.

 

 

 

I vote the answer is A :)


2715 posts

Uber Geek
+1 received by user: 440


  Reply # 2186226 24-Feb-2019 10:57
Send private message quote this post

If the answer a A now go out and find a supplier that makes a 20mm 90 degree swept bend with a 900mm radius.
AFAIK there isn't one.

I realise that the usual Chorus diagram is not drawn to scale but it would be a very poor representation of a 900mm radius bend in a 450mm deep trench.

448 posts

Ultimate Geek
+1 received by user: 168

Subscriber

  Reply # 2186241 24-Feb-2019 11:33
Send private message quote this post

Bung: 

I realise that the usual Chorus diagram is not drawn to scale but it would be a very poor representation of a 900mm radius bend in a 450mm deep trench.

 

Thats a good point.

 

But a 900mm length 90 deg sweep has a radius of 573mm. That still wouldn't fit in a 450mm dep trench.

 

And I agree having a 900mm radius bend is big, and I don't recall ever seeing one.

 

But if any one said to me you need a "900mm 90 deg sweeping bend" my first thought would be it is a bend with a radius of 900mm.

 

Can @Chorus shed some light.

 

 


2715 posts

Uber Geek
+1 received by user: 440


  Reply # 2186249 24-Feb-2019 11:49
Send private message quote this post

The 450mm deep is a minimum and I'd expect having the bend stick up out of the ground slightly wouldn't be a problem. If you didn't look at the 900mm notation the drawing looks like a 300mm radius. Unless it's a bend done on site the spec should state the actual Iplex/Marley/etc bend that's needed.

3310 posts

Uber Geek
+1 received by user: 680

Trusted

  Reply # 2187136 25-Feb-2019 23:37
Send private message quote this post

Here is what I give to electricians 
We ask them to make sure some string or pull wire is installed before its buried, and we mandate a larger 32mm solid flexi duct because ideal electrical sell some nice large PVC bends

 

 

 





Ray Taylor
Taylor Broadband (rural hawkes bay)
www.ruralkiwi.com

There is no place like localhost
For my general guide to extending your wireless network Click Here




3840 posts

Uber Geek
+1 received by user: 1555

Subscriber

  Reply # 2187172 26-Feb-2019 07:51
Send private message quote this post

Only stick formed bends at each end of the duct.

The 20mm duct is rather flexible and can be easily swept around 90 degree corners without the need for a formed bends.

Draw wire is good for a longer run (say 30m plus), otherwise it is just as easy for the boys to rod the duct over short distances.

Problems only come from ducts that have lots of formed bends in them. A continuous length swept around a corner doesnt make a problem.

 1 | 2
Filter this topic showing only the reply marked as answer View this topic in a long page with up to 500 replies per page Create new topic


Donate via Givealittle


Twitter »

Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:





News »

Amazon introduces new Kindle with adjustable front light
Posted 21-Mar-2019 20:14


A call from the companies providing internet access for the great majority of New Zealanders, to the companies with the greatest influence over social media content
Posted 19-Mar-2019 15:21


Two e-scooter companies selected for Wellington trial
Posted 15-Mar-2019 17:33


GeForce GTX 1660 available now
Posted 15-Mar-2019 08:47


Artificial Intelligence to double the rate of innovation in New Zealand by 2021
Posted 13-Mar-2019 14:47


LG demonstrates smart home concepts at LG InnoFest
Posted 13-Mar-2019 14:45


New Zealanders buying more expensive smartphones
Posted 11-Mar-2019 09:52


2degrees Offers Amazon Prime Video to Broadband Customers
Posted 8-Mar-2019 14:10


D-Link ANZ launches D-Fend AC2600 Wi-Fi Router Protected by McAfee
Posted 7-Mar-2019 11:09


Slingshot commissions celebrities to design new modems
Posted 5-Mar-2019 08:58


Symantec Annual Threat Report reveals more ambitious, destructive and stealthy attacks
Posted 28-Feb-2019 10:14


FUJIFILM launches high performing X-T30
Posted 28-Feb-2019 09:40


Netflix is killing content piracy says research
Posted 28-Feb-2019 09:33


Trend Micro finds shifting threats require kiwis to rethink security priorities
Posted 28-Feb-2019 09:27


Mainfreight uses Spark IoT Asset Tracking service
Posted 28-Feb-2019 09:25



Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.


Support Geekzone »

Our community of supporters help make Geekzone possible. Click the button below to join them.

Support Geezone on PressPatron



Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.