TE19002B – Switchboards and Switchgear
Module code
TE19002B
Module title
Switchboards and Switchgear
Prescription
People credited with this unit standard are able to demonstrate advanced knowledge of:
- switchgear principles;
- switchboard busbar sizes;
- busbar mounting and spacing methods;
- circuit breaker ratings;
- power factor control; and
- industrial and commercial switchboards.
Programmes
- BT0101
- TE1101
NZQA Level
Level 5
NZQA Credits
5
Delivery method
- Web-Enhanced
Learning hours
- Total learning hours
- 50
Resources required
- Content
- Element 1
Demonstrate advanced knowledge of switchgear principles.
Performance criteria
1.1 Terms associated with power switching are defined in accordance with current industry practice.
Range - terms - switchgear, ACB, MCCB, fuse switch, fuse disconnect, isolator, mains to generator changeover switches, power contactor, power factor switching contactors, control relays, solid state relays.
1.2 Principles of arc initiation and extinction are explained in terms of the properties of an arc.
Element 2
Demonstrate advanced knowledge of switchboard busbar sizes.
Range - three different busbars specified on switchboard drawings provided by the assessor.
Performance criteria
2.1 Busbar ratings are calculated from provided drawings and specifications.
Range - current, voltage, fault level, temperature, derating, ambient temperature.
2.2 Busbar sizes are calculated from the rating in accordance with specifications and industry practice.
Element 3
Demonstrate advanced knowledge of busbar mounting and spacing methods.
Performance criteria
3.1 Suitability of different fixing methods for two different busbar mounting applications is described in accordance with industry practice.
3.2 Methods of maintaining busbar insulation integrity during mounting are explained in accordance with industry practice.
3.3 Three methods of maintaining mechanical clearances between busbars are described and reasons for the need to maintain the clearances are explained in accordance with industry practice.
3.4 Methods for determining the clearance between busbar fixings are described and reasons for the need to maintain the clearance are explained in accordance with industry practice.
Element 4
Demonstrate advanced knowledge of circuit breaker ratings.
Performance criteria
4.1 Circuit breaker ratings are defined in accordance with industry practice.
Range - voltage rating, full load current rating, breaking capacity.
4.2 Circuit breaker breaking capacity in MVA is calculated for given data in accordance with industry practice.
Range - given data - voltage and short circuit current, percentage impedance, percentage regulation.
Element 5
Demonstrate advanced knowledge of power factor control.
Performance criteria
5.1 Installation, calibration, and maintenance of power factor equipment in industrial and commercial electrical installations is described in accordance with industry practice.
Range - auto controller setup, method of optimum setup for individual plant, monitoring of power factor over a given period.
5.2 Selection of power factor equipment for an industrial or commercial electrical installation is explained.
Range - selection of capacitors, high or low voltage, protection and selection of the contactors with damping resistors, use of surge protection.
5.3 Methods for identifying, removing, and disposing of PCB-filled capacitors are described in accordance with the Hazardous Substances and New Organisms Act 1996 and industry practice.
5.4 The use of HFRs is described in terms of the effect that VSDs and other electronic equipment have on power factors, and the reasons for these effects are explained.
Element 6
Demonstrate advanced knowledge of industrial and commercial switchboards.
Performance criteria
6.1 The purpose and functions of different types of switchboards are identified in accordance with industry practice.
Range - distribution switchboards - main, submain, distribution;
control and indication switchboards - control panels, control desk, motor control centre, power factor switchboards.
6.2 Relationships between switchboards in a large installation are explained using a line diagram, in accordance with current regulations and industry practice.
6.3 Different methods of switchboard construction are outlined in accordance with industry practice.
Range - cubicle, enclosed modular, cabinet.
6.4 Methods used to plan layout of switchboards for a particular installation are outlined in accordance with manufacturers' data.
Range - standard modular cubicles, jigsaw planners, plug-in modules.
