Testing For Electrical Rewiring Required?

[MiFTes 3]

I'm doing the rewiring for my 3 room resale flat and when I checked the HDB web I got the following :-

"Your block has not been provided with higher electrical loading. You will need to apply for an HDB permit to install new 15 Amps power points for air-conditioners or other higher capacity equipment/appliances (e.g. high powered IT equipment).

Under the Building Control (Amendment) Act, flat owners are required to engage Building & Construction Authority-trained air-con installers to install the air-con outside their flats and to keep the authority informed when they carry out the installation works.

However, for installation of air-conditioners using existing approved air-con points and other electrical works, there is no need to apply for an HDB permit. You need to submit an application (using SP Services Ltd's Form CS/5H) to HDB. Thereafter you may apply to SP Services Ltd to test the extensions."

Kind of confusing ...so does this means that I do not need a permit to do rewiring works but we need to submit for testing of the electrical works? Does the submission include the single line diagram? Is it the norm to request for a single line drawing of the electrical works before they do it?

Anyone can a advise on this? Thanks!