Project Maximum Demand 12MVA (over 56Ha site)
Date 2006 – 2010
Cost Approx R20M
Municipality City of Cape Town
Project Scope 3 X MV ( 11000V) switching substation buildings with arc-vented metalclad switchgear
Secondary MV underground cable reticulation comprising 20 B-type minisubstation

The Sheffield Business Park development is situated on a 56Ha site in Phillipi and its requirement for power was calculated at 12MVA (NMD), based on municipal benchmark estimates. The electrical infrastructure was designed to meet the demand for envisaged small to medium production factories that would occupy the erven within the development. The electrical infrastructure consists of three fully fledged brick built MV switching substations, a number of minisubstations, transformers and ring main units, as well as over 10 000m of underground MV cable networks.

Koukab's involvement started at feasibility stage (2006) where we engaged the municipality to negotiate and establish design parameters and load requirements. After the necessary approvals were obtained , we assisted the client with Procurement, Design, Tender Compilation and Contract management , right through to Commissioning and successful Handing Over in 2010.

Design Challenge
At the time of finalising the switchgear and substation design, the municipality (COCT) was in the process of changing their design standards to the new industry standard; arc-vented switchgear.

This afforded Koukab the opportunity to be an integral roleplayer in adapting the municipality's new switchgear standard and modifying the supplier's OEM switchgear to accommodate the requirements of the municipality. The underlying novelty of this project is due to the following characteristics:

It is notable that the new specification for all new brick built substations installed for the City of Cape Town was developed from this project, with regards to the external ARC venting system, cable trench design, the internal dimensions of the substation room, and the switch gear base frame.