Ring main size

[Boaky]

Does anyone know the maximum size ring main in an office
I'm don't meters I mean r1 + r2 size
The ring I have tested has a r1 and rn of both 1.6 and the r2 is 2.4
does this comply??
anyone know

 

[Sintra]

Calculate what your Zs will be then check if it complies with whatever overcurrent protective device you are using. Then calculate the volt drop to see if this is within limits.

 

[telectrix]

what he said ^^^^^. and do you mean r1 & r2 ( end /end) or R1&R2?

 

[Geordie Spark]

what he said ^^^^^. and do you mean r1 & r2 ( end /end) or R1&R2?

Trust you to pop in and complicate matters !!

 

[telectrix]

well, if it's R1+R2 he means that give 4.0 ohms, that means a 10A typeB MCB. or do the Electrical Trainee fix and bang in a RCD.

 

[Octopus]

Sounds like a long circuit. How big is the house/factory/ whatever

 

[kingeri]

Have you taken a Ze? That would allow you to work out Zs for the circuit if you haven't measured it. Either Zs or voltage drop are likely to make this circuit too long. Is it wired in 2.5 or 4mm? And a ring final circuit is subject to the same limitations whether it is in an office of not!!