889000topWESTMEAD HOSPITAL REDEVELOPMENT
889000topWESTMEAD HOSPITAL REDEVELOPMENT
(COMBINED ACUTE SERVICES BUILDING - CASB)
ELECTRICAL MAIN SWITCHBOARD
00WESTMEAD HOSPITAL REDEVELOPMENT
(COMBINED ACUTE SERVICES BUILDING - CASB)
ELECTRICAL MAIN SWITCHBOARD
centerbottomSANDRA WEHBE 19069379
300725 CONSTRUCTION TECHNOLOGY 6
765000SANDRA WEHBE 19069379
300725 CONSTRUCTION TECHNOLOGY 6
0100965000
CONTENTS
Westmead Hospital Redevelopment CASB Electrical Switchboard
28841707048500
Project Location & Site Context
The Westmead Hospital Redevelopment is located at the heart of the Parramatta CBD. The project is bounded by the Hawkesbury Road to the south, Redbank Road to the north, and the private roads of the existing Westmead Hospital and Childrens Hospital Westmead (CHW) buildings to the west and east respectively.
Project Brief
The project consists of works including the construction of the new 14-storey CASB building on the northern portion of the site, to provide increased service integration between the adults and childrens hospitals. These works include:
Two new Emergency Departments one for adults and one for children
25 Digital operating theatres
Expanded imaging, pharmacy and logistics More than 300 patient rooms, a high proportion of single rooms with dedicated carer zones
More spaces with natural light
Landscaped entry plaza and forecourt
Education, training and research embedded into every floor
1.5 floors for the University of Sydney to enable greater integration of education, research and health services delivery.
Additionally, construction of a new basement car park and associated forecourt plaza to the southern portion of the site.
The Electrical works include:
Demolition of existing electrical services
Allowance to
Electrical Switchboard
The appointed subcontractor on the project Heyday Electrical are to work in conjunction with the consultant JHA Consulting - in order to assess and determine the appropriate manufacturer and design for the MSBs located on both Level 4 and Level 1 of the building. The construction documentation was undertaken by Heyday with a peer review and sign off on design by JHA, routine construction attendance & reporting by JHA and also witness testing & commissioning input from JHA.
As a result, the manufacturer chosen was LAI Switchboards which is an Australian manufacturer based from their Brisbane factory. There was a lead time of 8-12 weeks from the approval of shop drawings with Factory Acceptance Testing (FAT) included at factory for each MSB. The switchboards provided are as follows:
Current Rating 4000A
Operational Voltage 230/400Vac @ 50Hz
Fault Rating 85kA for 1 second
Degree of Protection IP 43
Form of Segregation Form 3b (as AS3439.1)
Weight 13650kg (each MSB with all modules assembled)
Each switchboard will:
Have a dedicated feed from each chamber substation located on Level 4
To be housed within its own 2 hour fire rated room
Receive Incoming supply via an Automatic Transfer Switch & Manual Transfer Switch (linking to n+1 generator)
3 main sections consistent with the schematic design:
Essential L + P
Essential Mechanical + other trades
Safety Section
Form 3B construction
Provide a provision of 30% spare bus bar capacity for future circuit breaker installation
Switchboards supplying emergency, critical and UPS loads will be equipped with switchgear that is monitored Electrical meters connected to the EMS
855345-32258000
Location on Site
The new MSBs were located at the following:
1xMSB in a plant room on Level 1 of the Innovation Centre (location marked in blue on plan)
4xMSB in separate plant rooms at Level 4 of the CASB building
9264654699000
The sizes of these plant rooms vary. On level 4 they range from 60m2 to 66m2 whilst on Level 1 the plant room containing the switchboard is 81m2. This was a problem for the installation of the MSBs because they were difficult to install due to the limited space and the fact that these MSBs were quite long.
Site plan which displays length of MSBs to take up most of plant room.
In order to install the MSBs they had to be manufactured in modules and then assembled on site to be installed successfully.
Logistics & Access & Installation
The delivery and installation of the MSBs were fairly straight forward. They were delivered by truck as the factory is located in Brisbane and came in modules (sections) as they were too long to be installed as is, and were assembled on site.
The lead time was fixed and hence very difficult to accelerate to meet the construction programme. Lifting points of the MSBs for installation were engineered and signed off by the Structural engineer who stated that these points were critical to the installation of the MSBs and correct installation as to not damage the equipment.
The MSB did not need any specialist lifting. Also, no traffic management plans or council approvals needed as equipment fit onto a standard flatbed truck and was able to be unloaded in the loading dock.
With the approved design of the Main switch room where the MSBs are located on level 4, they are positioned within the very centre of the floorplan. This meant that the MSBs needed to be lifted to the level and skated across to the final location. This was not ideal due to the fact that the corridors were tight and main switch rooms were narrow, providing it very difficult to install. This meant that the contractors had to be diligent with movements when navigating the MSBs through level 4 and caused minor delays within the construction program. There were no such problems with the switch board on Level 1 as it was located on the east-west of the level on the edge of the floor plan. This meant that once it was on Level 1 it was easy to place in the final location of the plant room.
Installation
With accordance to the Electrical specification, the installation requirements for this project in order to achieve compliance include:
Installation of all power distribution boards shall be on stands or bolted to walls /columns and must be wired in accordance with electrical codes and have
Adequate length of cable to allow for repositioning if required.
Allowance to be made for initial installation for formwork and reconnection after the formwork stripping has been completed.
Allow to raise DB from floor onto the walls/columns once plasterboard sheeting is complete or hang from overhead slab.
Note: All power boards/sub-boards will be supplied fully equipped with both 20 x 10 amp double GPOs, and 2 x three phase power outlets. Allowance made to supply switch boards equipped to BCA and industry best practice additional or specific requirements will be catered for on an individual basis only.
Electrical contractor to include for the engagement of local authority to assist with testing. Local authority to isolate supply to main board at substation and reenergise. This process needs to be completed successfully twice for test
to be completed.
Prior to the delivery of the MSBs to site, Factory Acceptance Testing (FAT) was conducted on all 5 MSBs to ensure that they are in working order and up to spec before being transported to the project. This included a visual inspection for the following:
Check the layout of fitted components
Check the overall dimension of switchboard, size of busbars, cables and earthing conductors and location of feeder entry point.
Check and verify the brand, model, and circuit identification of components installed such as breakers, current transformers, fuses, ammeters, voltmeters, power meters and protection relays etc.
Check overall paint work, door locking device, door gasket, door hinges, door cut-out holes
Check the busbar and cable tightening, the marking, busbar clearance, base angle bar and plinth
Check the labels, name plate and phase identification
And also an insulation test to measure insulation resistance and a high voltage injection test.
The MSBs must pass these test to be deemed fit for use and also to ensure compliance and the specifications and requirements have been met.
Recommendations & Conclusion
To conclude, the Westmead Redevelopment project was successfully complete. The MSBs were located on different levels due to design constraints. This was beneficial to the running of the electrical services in the building, however it was slightly problematic and a nuisance for the installation process.
The proposed recommendation is to have the main switch room on the Ground floor of the building in order for ease of installation. Moreover, this will allow easier access for maintenance of the switchboards over the life of the building as they are all located on one level which is easily accessible.
