General Design Guidance
The scope and intent of this document are intended to convey general design guidance regarding electrical systems at water and waste facilities. This document addresses specifics related to equipment type, selection, and configuration.
However, the designs are presented without knowledge of the specific process implementation.
System Configuration Concepts
The electrical system configuration for a facility is typically selected in the early planning stages for design. This section presents various system configuration concepts to guide the designer in typical configurations that may be applicable to the project at hand.
Note that a facility could potentially use multiple concepts from the proposed configurations. For larger facilities, it is expected that the overall system configuration will be complex, and will not necessarily be categorized In the indicated configurations.
Detailed review of the specific constraints and risks associated with the particular application must be performed to identify potential modifications or additions required to the proposed system configurations.
The term standby generator is utilized in this section to represent a generator that is not rated for continuous duty If the generator is utilized to power life-safety systems, it must be designated as an emergency generator.
Configuration A – 208/120V
Configuration A, which is a simple system with 208/120V supply from the utility, is only applicable to the smallest of facilities. It would typically only be utilized for small buildings without any significant loads.
NOTE! – A single phase 120/240V service could also be considered where no significant motor loads are present.
A single line diagram is shown in Figure 1.
Configuration B – 600V Distribution
Configuration B, which is a simple radial system with a 600V supply from the utility, is applicable to the facilities with lower reliability requirements. A sample single line diagram is shown in Figure 2.
No redundancy, or standby generation, is provided by this configuration.
While any utility power failure or equipment failure will result in an outage, operation is simple and the capital cost is relatively low.
|Title:||Electrical Design Guide For Water and Waste Treatment Water Facilities – The Water & Waste Department at The City of Winnipeg|
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