Are their any things that should be taken care of while cabling and conduit/raceways are being laid ?

There are multiple ways of laying conduits such as

(1) Electrical Type (conduits, raceways, flexible conduits)
(2) Plumbing type (like Cold water pipes used commonly in OFC cabling)

We decided to use (1) and have no experience with (2) so as offer any advice. There in case you are also deciding to electrical type conduits, we recommend that:

(1) Sharp 90 degree bend should not be used For either category X cable or Optical Fiber as it cannot meet bend radius requirements. It can damage cable or compromise it to an extent that it would not be usable after laying.

(2) Circular junction boxes may be used for copper cables, but should be avoided for Optical Fiber cables to be on safe side. 

(3) Similarly Slip type short bends can be avoided for optical fibers and instead slip type long bends be used only.  long bends offer higher bend radius and safer to use for optical fiber cables. 

(4) Camera cables can use 16 or 20mm conduit as we usually run only one cable to each camera point, but for switch-switch links , this maybe more than 1 or may need to have future addition and therefore atleast 25mm conduits are recommended. Integrators frequently report to using 25mm conduits everywhere as it makes cable pulling easier, but it has a negative impact on costs and the bulk of the conduit costs are of camera-switch type and not switch-switch.

(5) If multiple OFC cables are run for some length in one conduit and its required to split them to go in different directions on cable trays, then use a combination of Y junction (including daisy chaining them) and long bends to achieve this. Installers would just be tempted to use a 3-way or 4-Way junction box which would be just fine for copper cables but unsafe for optical fibers.

(6) For switch-switch links, a two way circular junction box be used after few lengths of conduit. This will help in pulling new cables in future if required. You may decide to run a pull string along with OFC to make this task easier.  

(7) For indoor cabling, Casing (raceways) are used rather than conduit pipes as conduit pipes are not very aesthetic to look at. And these casing are run mostly on corners of walls for ,most (or as much as possible) of their lengths rather than in the middle of walls, so as to make them inconspicuous to human eye. The ideal scenario is conduits are are chased inside walls, but that cannot happen if upfront planning is not done during building construction and we have to retrofit. 

For our project, we used Precision brand conduits and Modi Casing & Caping (both along with accessories) for raceways as we found them to best in quality in locally available brands. Junction boxes are other non-big brand name but good quality ones, while outdoor boxes are Hensel Type Clones. 

- Suman Kumar Luthra @ APRC-P3 Telecom Sub-Committee