Jump to content
Traineeboy

Three Phase Power in a house

Recommended Posts

Traineeboy

 I came arcoss this in a house. From my undestanding its three phase power but only one phase is being utilised. Does this mean it's just treated as single phase. As in the the max ZE for TN-S is 0.8 or because it's 3 phase it's diferent ? I know when you normally test three phase power you test between phases but I assume you would just yest this as it was single phase as only one phase is being used. Am i right in my thinking ? 

3pp.jpg

Share this post


Link to post
Share on other sites
Andy™

3 phase at the service head but your supply to installation is single phase. Ze is the same regardless of single or 3 phase

Share this post


Link to post
Share on other sites
Traineeboy

Ok got ya. So really it’s treated as if I was testing single phase. 

Share this post


Link to post
Share on other sites
ProDave
38 minutes ago, Traineeboy said:

Ok got ya. So really it’s treated as if I was testing single phase. 

You are only testing single phase, that's what it is.

 

The head might suggest it could be upgraded to a 3 phase supply if required.

Share this post


Link to post
Share on other sites
SPECIAL LOCATION

The only conductors you have any authority to access are;

 

A single phase,

A neutral, 

and an Earth...

 

Unless you were planning on cutting some seals?

 

:popcorn 

Share this post


Link to post
Share on other sites
Traineeboy

Lol no the seals will be left alone. In theory if the customer wanted to supply an outbuilding then he could have another meter put in and then one of the spare phases could be used to power the outbuilding? Then that would also be classed as a single phase install. I guess it’s only classed as 3 phase if all the phases go into one Distribution board and then the load has to be balanced , right ? 

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

×

Important Information

Terms of UseWe have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.