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2 phase and neutral..

Discussion in 'Electrics UK' started by Thomo39, 20 Jan 2020.

  1. Thomo39

    Thomo39

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    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.
     
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  3. oldbutnotdead

    oldbutnotdead

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    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.
     
  4. RF Lighting

    RF Lighting

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    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”
     
  5. Thomo39

    Thomo39

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    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
     
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  7. SUNRAY

    SUNRAY

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    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
     
  8. Thomo39

    Thomo39

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    Yeah same cheers
     
  9. SUNRAY

    SUNRAY

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    What are the existing markings? if any

    As long as the markings are clearly shown on the drawings it doesn't matter.
     
    Last edited: 20 Jan 2020
  10. Simon35

    Simon35

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