All little bit of help

[sprinter1801]

Hello All

I am working on my course and just wanted to ask a few questions on some home work

First,

In a garage there is installed a small CU (1x30ma RCD and 1x20amp MCB)
Earth rod in garden (ze reading 27.6 ohms)

Lighting is run from a 6amp FCU which is run from the 20am redial circuit

My question is would a PFC of 8.33 amps sound about right and is the lower reading caused by the higher reading of the earth rod

Also how would you record the lighting circuit on the installation form ?


Many Thanks