Supply side L1/L2/L3 OR T1/T2/T3 does it matter?

[shoddyboby]

Hello all.....Im Bobby ..I have been working most of my life doing domestic work and was wandering if you industrial electricians could offer me a little advice ..I have recently started working in a more industrail setting which is largely fine Its just from time to time I can get a little bit unsure for example I have been connecting up 3 phase isolators for ac units/condensers etc my understanding is that you would as a rule always connect ur supply cables to L1,L2,L3 however I was discussing this with a coleauge and he seems to think that you would connect to T1/T2/T3 .. would this be the same for contactors? anyone that could offer some advice It would greatly appreciated thanks

 

[telectrix]

the L's are supply and the T's are load.

 

[plugsandsparks]

L1, L2, L3 i would generally expect to be line ccts as in supply.

Had one the other day which was R,S,T for supply and U, V, W for load side. Was an old inverter.

Often see U,V,W for motors nowadays

Thing is i absolutely make no assumptions and follow the drawing if i am wiring and labeling and use the manufacturers data sheets if i am fault finding.

 

[grantr37]

To me:

L1 = LINE 1

L2 = LINE 2

L3= LINE 3

T1= TRANSFORMER 1

T2= TRANSFORMER 2

T3= TRANSFORMER 3

As I was trained in Electrical and Electronics before I went into bashing and denting other types of work...

Some Electrical Engineers that are on here will also see :


T1 = Tap 1

T2 = Tap 2

T3 = Tap 3 (of a Transformer secondary winding on the output reduced Voltage side)

L1 L2 AND L3 are always used by myself for marking/tagging/labeling my 3 phase supply inputs and cable break outs/boot off's...

The U V W that Plug and Sparks mentioned is on a lot of German hardware....



so yes stick to L1 L2 L3

 

[grantr37]

obviously on the Electronics side of things,incase anybody smart pipes in...

L1 = INDUCTOR 1

L2 = INDUCTOR 2

L3 = INDUCTOR 3

That's just because I know some smarty will be itching to pipe in tuppence worth...

 

[plugsandsparks]

Got me thinking.... also seen L1,L2,L3, 4,5,6 etc becoming suffix A after the contactor and suffix B after the local isolater, e.g. L10,L11,L12 on supply side of contactor becoming L10A, L11A, L12A on load side then changing to L10B, L11B, L12B on load side of local isolater.

 

[Deleted member 26818]

I guess that harmonisation did make everything simple and easier to understand after all.

 

[Knobhead]

U1, U2, V1, V2, W1, W2, X, Y, Z, A, B, C, D, E, F, L1, L2, L3. A, B, C, n, c, b, a,

If anyone finds a standard, let me know.

 

[snowhead]

U1, U2, V1, V2, W1, W2, X, Y, Z, A, B, C, D, E, F, L1, L2, L3. A, B, C, n, c, b, a,

If anyone finds a standard, let me know.

Yes, there is one, it's any letters of the alphabet with or without numbers and or any colour.

 

[Knobhead]

Ever dropped a box of old style individual cable markers? Numbers? Letters? You get what your given!