2 phase and neutral..

[Thomo39]

Afternoon all, testing a commercial property and its on a 2 phase and neutral supply.
Seperate phases i.e 480 v between phases, previous testers has labelled certain stuff 1/1 and 1/2 etc , question is would guys label this way or would you be labelling 1L1 , 1L2 etc, some might think it doesn't make a difference but our gaffer is insistent on clear labelling.

 

[oldbutnotdead]

480 between phases? Sounds high
Labelling- yes it wants to be clear and consistent. I've tended to use a letter for the phase & then a number to ID the circuit- number/number has scope for confusion.

 

[RF Lighting]

480V is normal for split phase supplies.

It doesn’t really matter how you label things as long as you are consistent across the whole site.

I would normally fit a label which read something like “DB D 7L2”

 

[Thomo39]

Yeah its old old switchgear, its basically 240v +240v so I would think its not actually a 3 phase supply but 2 individual single phases brought into the property.
This is why my labelling of 1L1 and 1L2 could be argued isn't technically correct

 

[SUNRAY]

As long as the meaning of 1L1 etc is clear.

In my experience of 3PH DB's some would be PH1 L CCT1 but others are CCT1 L PH1 but other are DB1 L CCT1

 

[Thomo39]

480V is normal for split phase supplies.

It doesn’t really matter how you label things as long as you are consistent across the whole site.

I would normally fit a label which read something like “DB D 7L2”

Yeah same cheers

 

[SUNRAY]

What are the existing markings? if any

As long as the markings are clearly shown on the drawings it doesn't matter.

 

[Simon35]

Yeah its old old switchgear, its basically 240v +240v so I would think its not actually a 3 phase supply but 2 individual single phases brought into the property.
This is why my labelling of 1L1 and 1L2 could be argued isn't technically correct

A UK 3 phase supply would not be 480V line voltage, so must be from a split phase transformer. Is it a farm?