GM Pontiac Mechanical Equipment Control Wiring Design
May 07, 2021
17
| STATEMENT OF PROBLEM There were significant delays in obtaining control wiring drawings from the mechanical subcontractor for the cooling tower, the ARUs, and the substation W HV units. This led to several delays with the electrical installation of the unit controls as the electrical subcontractor could not do anything until they had the drawings. Electricians had started asking for the drawings months in advance. Additionally, due to the delay for control drawings, electricians proceeded with working on unapproved marked-up control wiring drawings in order to maintain the schedule. COURSE OF ACTION None LESSON LEARNED 1) Control wiring design must be completed by the mechanical subcontractor in a timely manner and must first be reviewed and approved by the AE prior to electricians proceeding with installation. 2) CCC must perform more thorough scope reviews with subs and vet engineers at bid time. 3) CCC to verify that subs are able to handle the work load. |
