[Grammar] Are these sentences grammatically correct?

[JRD]

Please confirm whether we need to provide the cable accessories for sub-contractor to complete the installation of strip lights or not? Is this was incurred in our budget?

We have never had a such experience in providing cable accessories for installation of strip lights by sub-contractor in any of our projects.

 

[probus]

Please confirm whether or not we need to provide the cable accessories for the sub-contractor to complete the installation of strip lights. (not ?)

Was this included in our budget?

We have never provided cable accessories for installation of strip lights by a (or the) sub-contractor in any of our projects.