TP&N board

Perhaps - because I really enjoy a bit of metal work, I often install top, one side and bottom trunking. This also allows for circuits like underfloor bus bars or underfloor circuits in my usual environment - which is offices - to get terminated at the bottom of the DB. (In the bottom trunking) 


For one small 3 phase DB - I set up a work bench and build the empty DB and trunking on the bench, and once constructed, lift the whole lot into position on the wall, and mark out the DB mounting holes. (use a bubble to ensure its straight)  I install uni strut directly over those DB mounting holes position, and hang the DB and trunking on uni strut. The trunking also needs some uni strut so this is not the easiest way but it does end up looking pretty good. 


Obviously if I'm doing MCCB pannels and multiple three phase DBs in one area then this is impractical and I will need to build it on the wall piece by piece. 


You can build it on the wall piece by piece but you tend to mount and dismount each piece a million times... or perhaps I say I tend to do this.

The trunking 45 degree corners are especially difficult to do piece by piece on the wall, but fairly easy to do on a work bench. It often becomes a two man job to lift and mount the single DB assembly but it only takes a few moments. 


I always use paxolin between trunking and DB - I'm a big fan of paxolin - and have a large sheet of it always in storage, ready for similar jobs.


If you drop the top and bottom plate off the 3 phase DB - this will give you a template for the paxolin, into which you can cut a 50mm slot - for the cables to pass through. On a big three phase DB - I don't want the tails coming in at the top and all of the circuits going out at the top - it just gets too crowded. Also with top and bottom entry - and if you take your circuits through both top and bottom, your DB sides don't get too full. (Depends on the size of DB you're fitting)


The paxolin will allow space too, for the trunking lid and DB lid to go on and off easily.

Perhaps - because I really enjoy a bit of metal work, I often install top, one side and bottom trunking. This also allows for circuits like underfloor bus bars or underfloor circuits in my usual environment - which is offices - to get terminated at the bottom of the DB. (In the bottom trunking) 


For one small 3 phase DB - I set up a work bench and build the empty DB and trunking on the bench, and once constructed, lift the whole lot into position on the wall, and mark out the DB mounting holes. (use a bubble to ensure its straight)  I install uni strut directly over those DB mounting holes position, and hang the DB and trunking on uni strut. The trunking also needs some uni strut so this is not the easiest way but it does end up looking pretty good. 


Obviously if I'm doing MCCB pannels and multiple three phase DBs in one area then this is impractical and I will need to build it on the wall piece by piece. 


You can build it on the wall piece by piece but you tend to mount and dismount each piece a million times... or perhaps I say I tend to do this.

The trunking 45 degree corners are especially difficult to do piece by piece on the wall, but fairly easy to do on a work bench. It often becomes a two man job to lift and mount the single DB assembly but it only takes a few moments. 


I always use paxolin between trunking and DB - I'm a big fan of paxolin - and have a large sheet of it always in storage, ready for similar jobs.


If you drop the top and bottom plate off the 3 phase DB - this will give you a template for the paxolin, into which you can cut a 50mm slot - for the cables to pass through. On a big three phase DB - I don't want the tails coming in at the top and all of the circuits going out at the top - it just gets too crowded. Also with top and bottom entry - and if you take your circuits through both top and bottom, your DB sides don't get too full. (Depends on the size of DB you're fitting)


The paxolin will allow space too, for the trunking lid and DB lid to go on and off easily.