Three phase circuit breaker - Utilising only one phase | on ElectriciansForums

Discuss Three phase circuit breaker - Utilising only one phase in the UK Electrical Forum area at ElectriciansForums.net

Joined
Dec 14, 2020
Messages
19
Reaction score
6
Location
Southport
I have a scenario where there is a three phase DB in a commercial property where there are mixture of three phase and single phase washing machines.

All the washing machines including those that are single phase have triple pole MCBs installed and wired in 5-core to 16A rotary isolator. from the same isolator a 5-core rubber flex is used and then of those five cores two of the phase L2 and L3 have been WAGO'd in the next single phase washing machine, exactly the same but L1 and L3 have been WAGO'd

Googling this type of things has yielded a mix bag of opinion from stating remove the TP breaker and install a single pole breaker, some have said this is fine as some machine would utilise only a single phase on low-load in any case. Other have said it is okay as the TP breaker would still trip on overload of the single phase being used or on short circuit and have gone as far as saying it's possibly been done where a pre-existing machine used the three phases and now only utilise one.

Would you recommend making safe the other two phases at each end of the cable and installing a single pole MCB? or Would you say that there aren't any issues for this setup?

Any insights or opinions on this one would be grateful.
 

Reply to Three phase circuit breaker - Utilising only one phase in the UK Electrical Forum area at ElectriciansForums.net

News and Offers from Sponsors

  • Sticky
  • Article
Wicked I've just actually looked through it and it's very smart. Some good stuff in it. There's a tile association company that do a magazine...
Replies
2
Views
357
  • Article
OFFICIAL SPONSORS These Official Forum Sponsors May Provide Discounts to Regular Forum Members - If you would like to sponsor us then...
Replies
0
Views
322
  • Article
Hi everyone, Another weekend, another sale! Get ready for colder days with Haverland Radiators, combining efficiency with modern design. Keep...
Replies
0
Views
369

Similar threads

I really can't see a problem with it assuming there is a neutral there.
Replies
6
Views
625
Has the cover been removed, is it TP bussbar? I fitted one as @oscar21 linked to a few months ago, it was actually a nice board and with the TP...
Replies
5
Views
540

OFFICIAL SPONSORS

Electrical Goods - Electrical Tools - Brand Names Electrician Courses Green Electrical Goods PCB Way Electrical Goods - Electrical Tools - Brand Names Pushfit Wire Connectors Electric Underfloor Heating Electrician Courses
These Official Forum Sponsors May Provide Discounts to Regular Forum Members - If you would like to sponsor us then CLICK HERE and post a thread with who you are, and we'll send you some stats etc

YOUR Unread Posts

This website was designed, optimised and is hosted by untold.media Operating under the name Untold Media since 2001.
Back
Top