Low Voltage (LV) Cable Termination in Transformers

Low Voltage (LV) Cable Termination in Transformers: A Step-by-Step Guide
Proper termination of low voltage cables in transformers is crucial for ensuring safe and efficient electrical connections. Here’s a detailed process to guide you through the termination:
Preparation:
Safety First: Ensure all safety protocols are followed. Wear appropriate personal protective equipment (PPE) and verify that the transformer is de-energized.
Tools and Materials: Gather all necessary tools and materials, including cable lugs, crimping tools, heat shrink tubing, and insulation tape.
Cable Stripping:
Remove Outer Sheath: Carefully strip the outer sheath of the cable without damaging the inner insulation or conductors.
Strip Insulation: Strip the insulation from the ends of the conductors to expose the bare wire. The length of the exposed wire should match the size of the cable lug.
Crimping the Cable Lugs:
Select Appropriate Lugs: Choose the correct size and type of cable lugs for the conductors.
Crimping: Insert the stripped conductor into the lug and use a crimping tool to secure it. Ensure a tight and secure connection to avoid any loose contacts.
Applying Heat Shrink Tubing:
Position Tubing: Slide heat shrink tubing over the crimped lug and the exposed conductor.
Heat Application: Use a heat gun to shrink the tubing around the connection, providing insulation and protection against moisture and contaminants.
Connecting to the Transformer:
Terminal Preparation: Clean the transformer terminals to ensure a good electrical connection.
Bolt Connection: Attach the crimped lugs to the transformer terminals using appropriate bolts and washers. Tighten the bolts securely to ensure a firm connection.
Insulation and Protection:
Insulation Tape: Wrap insulation tape around the connection points to provide additional insulation and protection.
Cable Management: Secure the cables using cable ties or clamps to prevent movement and reduce mechanical stress on the connections.
Testing and Verification:
Continuity Test: Perform a continuity test to ensure there are no breaks in the connection.
Insulation Resistance Test: Check the insulation resistance to verify the integrity of the insulation.
Final Inspection: Conduct a final visual inspection to ensure all connections are secure and properly insulated.
Re-energizing the Transformer:
Safety Check: Ensure all tools and materials are removed from the work area.
Power On: Re-energize the transformer and monitor the connections for any signs of overheating or abnormal operation.

[@noelbyrne8735]

Red, yellow, blue & black = U, V, W & N not W, U, V & N.
No cable gland used.
Termination enclosure open to ingress and moisture.
Wire lugs not crimped correctly.

[@drakeZd]

n is nuetral

[@noelbyrne8735]

@@drakeZd it sure is 👏👏👏

[@Electricalwrk]

yes

Terminals labeled W V U, cables terminated U V W. Clever...

[@АлександрЛужбинин-щ4д]

Не хватает термоусадочной трубки для изоляции наконечников.

[@Electricalwrk]

yes

[@drakeZd]

bro how many amps do these wires carrry?

[@Electricalwrk]

for 1mm 1.4A. 185×1.4= 259A for single cable. (normal temperature)

[@drakeZd]

wow that is alot of amps imagine connecting a 1 amp fuse what will happen

[@jackwayne833]

bro has terminated wrong phase sequence

[@Electricalwrk]

yes. but it's no problem

[@jakubjk5074]

Which country do you use this colour of phases?

[@Electricalwrk]

normally use RYB. Arabian County

[@dominichueber5646]

Interesting, I didn't know that. But I kinda like them.
We use boring Brown, Black and Grey for phase, and Blue for Neutral

[@Electricalwrk]

@@dominichueber5646 it's depends on country. which country use which colour. but internationally RYB/ BBG both are use commonly

[@Dimmik8490]

Yellow, green, red for phase and blue for neutral in Russia

[@dominichueber5646]

@@Dimmik8490 okay, I like them even more. Like traffic lights.

[@raufbond3609]

Please is it TN-C or TN-C-S

[@Electricalwrk]

tn-c ?

[@raufbond3609]

@@Electricalwrk okay thanks

[@dominichueber5646]

​@@raufbond3609 TN-C-S bzw. TN-S ist es oder wird es dann erst beim Verbraucher (zum Beispiel ein Wohnhaus) - wo der PEN im PE und N aufgeteilt wird.
( !! - er darf danach auch nicht mehr wieder verbunden werden!)
Bin nicht sicher, aber ich denke Du sprichst Deutsch ;)

[@raufbond3609]

@@dominichueber5646 can you please write in English

[@amazigh_304]

why the common wire is black and why its connected with the earth

[@noelbyrne8735]

Because they are using the old British colour code where black is neutral and the earth is there to earth/ground the star point of the transformer and to create a PE conductor.

[@raufbond3609]

So in this connection the neutral and the earth are together??

[@Electricalwrk]

yes

[@dominichueber5646]

This is also standart for us in Austria/Europe.
And in Germany as far I know

[@Le.pecheur-ardennais]

Au Luxembourg,
Dans les coffrets électriques,
Le neutre et la terre sont ensemble

[@atik0781]

Good job

[@Electricalwrk]

Thanks

[@Electricalwrk]

❤

[@x84pav84x]

Напряжение ему включите, веселей работать будет. А так надо всё аккуратней делать и не спеша. Спешка при ловле блох нужна .

[@EULZG56117]

Это ускоренное видео и вы это прекрасно видите, но откуда столько злости

[@felipetvictor]

Top job

[@Electricalwrk]

👍

[@mrtopcat2]

What material is the cable made of? I thought I will see copper, but the cable looked shiny silver.

[@nickolaspina2970]

Aluminum

[@Electricalwrk]

yes.

[@SharifUrRehman]

W red yellow u blue

[@Electricalwrk]

yes UVW = RYB

[@poiuycat]

why my motor running reverse 🤣😂🤣😅🤣

[@kyleanderson6201]

I think he should stick with magic carpet repair or camel jockeying and stay away from electricity

[@Electricalwrk]

🙄