NGEE ANN POL YTECHNIC - DEBFI Module: Building Electrical Systems \& Design (102BED) Question $$ 4 \quad $$ (8 marks) $$ \begin{array}{ll} ext { (a) Explain what is type-tested switchboard? } \ ext { (b) Explain what is regulated electricity tariff and what type of consumer is charged } \ ext { under this type of tariff. } \ ext { (c) What is the purpose of installed the voltmeter in a main switchboard? }\end{array} $$

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NGEE ANN POL YTECHNIC - DEBFI Module: Building Electrical Systems \& Design (102BED) Question $$ 4 \quad $$ (8 marks) $$ \begin{array}{ll}	ext { (a) Explain what is type-tested switchboard? } \ 	ext { (b) Explain what is regulated electricity tariff and what type of consumer is charged } \ 	ext { under this type of tariff. } \ 	ext { (c) What is the purpose of installed the voltmeter in a main switchboard? }\end{array} $$

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### (a) Explain what is a type-tested switchboard?

A type-tested switchboard is a type of electrical distribution board that has undergone rigorous testing to ensure it meets specific performance and safety standards. These tests are conducted in accordance with international standards, such as IEC 61439, which cover various aspects of electrical equipment, including temperature rise, dielectric properties, short-circuit withstand strength, and mechanical properties.

The key features of a type-tested switchboard include:

- **Safety Assurance**: The testing process ensures that the switchboard can safely handle the electrical loads and conditions it is designed for.
- **Reliability**: Type-tested switchboards are designed to operate reliably under specified conditions, reducing the risk of failures.
- **Standardization**: They provide a level of standardization in design and performance, making it easier for engineers and electricians to specify and install them.
- **Documentation**: Type-tested switchboards come with documentation that certifies their compliance with the relevant standards, which is important for regulatory and insurance purposes.

### (b) Explain what is a regulated electricity tariff and what type of consumer is charged under this type of tariff.

A regulated electricity tariff is a pricing structure set by a government or regulatory authority that determines the rates at which electricity is sold to consumers. These tariffs are designed to ensure that electricity prices remain affordable and stable for consumers while allowing utility companies to recover their costs and earn a reasonable return on investment.

Types of consumers typically charged under regulated electricity tariffs include:

- **Residential Consumers**: Households that use electricity for lighting, heating, and appliances often fall under regulated tariffs to protect them from price volatility.
- **Small Commercial Consumers**: Small businesses that consume a limited amount of electricity may also be charged under regulated tariffs to ensure they can operate without facing excessive energy costs.
- **Low-Income Consumers**: Special provisions may be made for low-income households to ensure they have access to affordable electricity.

Regulated tariffs can vary based on factors such as consumption levels, time of use, and the specific regulations in place in a given region.

### (c) What is the purpose of installing a voltmeter in a main switchboard?

The purpose of installing a voltmeter in a main switchboard is to monitor the voltage levels of the electrical supply system. This serves several important functions:

1. **Voltage Monitoring**: A voltmeter provides real-time readings of the voltage supplied to the electrical system, allowing operators to ensure that the voltage remains within acceptable limits.

2. **System Protection**: By monitoring voltage levels, operators can detect abnormal conditions such as overvoltage or undervoltage, which can lead to equipment damage or failure. This allows for timely intervention to protect sensitive electrical equipment.

3. **Load Management**: Understanding voltage levels helps in managing the electrical load effectively, ensuring that the system operates efficiently and reducing the risk of overloads.

4. **Troubleshooting**: If there are issues with the electrical supply, a voltmeter can help diagnose problems by providing information about voltage fluctuations or irregularities.

5. **Compliance and Reporting**: Monitoring voltage levels can be important for compliance with regulatory standards and for reporting purposes, ensuring that the electrical system operates within the required parameters.

In summary, a voltmeter in a main switchboard is a critical tool for ensuring the safe and efficient operation of electrical systems.
(a) A type-tested switchboard is an electrical distribution board that has passed strict safety and performance tests to meet international standards like IEC 61439. It ensures safety, reliability, standardization, and comes with compliance documentation. (b) A regulated electricity tariff is a government-set pricing structure for electricity. It's designed to keep prices stable and affordable for consumers like residential, small commercial, and low-income households. (c) A voltmeter in a main switchboard is used to monitor voltage levels, ensuring system safety, protecting equipment, managing loads, troubleshooting, and complying with regulations.

NGEE ANN POL YTECHNIC - DEBFI
Module: Building Electrical Systems & Design (102BED)
Question (8 marks)

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NGEE ANN POL YTECHNIC - DEBFI Module: Building Electrical Systems & Design (102BED) Question (8 marks)