final assignment 2 code

.docx

School

Conestoga College *

*We aren’t endorsed by this school

Course

8021

Subject

Electrical Engineering

Date

Apr 3, 2024

Type

docx

Pages

Uploaded by SuperHumanBear4093 on coursehero.com

1 Assignment 2 Applied Electrical Motion and Control Management, Conestoga College ELEC8021 - Fall 2023 - Section 2: Electrical Code for Engineers Course Instructor – Krunal Patel Assignment Due Date – December 4 1. Define the following terms I. Difference between Isolating switch and circuit Breaker –

2 Electrical devices that regulate the flow of electricity in a circuit include circuit breakers and isolating switches. They are made to function differently and serve distinct functions, though. A circuit's portion can be isolated from the rest of the electrical system using insulating switches. They should only be used when the circuit is de-energized since they are not intended to stop current flow when under load. In high-voltage applications like distribution substations and power transmission lines, isolating switches are commonly employed. The purpose of circuit breakers is to safeguard a circuit from overcurrent situations. They can be used to guard against overload and short-circuit failures since they have the ability to stop current flow while under stress. Typically, circuit breakers are utilised in lower-voltage applications like those found in homes and businesses. Examples of isolating switches are - Disconnect switches, Knife switches and Gang- operated switches. Examples of circuit breakers are - Miniature circuit breakers (MCBs), Molded case circuit breakers (MCCBs), Air circuit breakers (ACBs), Vacuum circuit breakers (VCBs). II. Equipment Protection level – An equipment protection level (EPL) is a rating that defines the level of protection an electrical device needs to have to safely operate in a hazardous location. EPLs are mentioned with specifications in the Canadian Electrical Code, Part I (CEC) in Tables 18 and 18A.

3 The EPL of a device depends on the type of hazardous location it will be used in and also on the type of flammable material it is likely to be exposed to. There are six EPLs, ranging from EPL Ga to EPL Gb. EPL Ga is the lowest level of protection and is required for devices that are not likely to be exposed to flammable materials. EPL Gb is the highest level of protection and is required for devices that are likely to be exposed to flammable materials in high concentrations. Here are some examples of EPLs for specific types of electrical devices: A motor that is used to drive a pump in a gasoline storage tank would need to have an EPL of EPL Gb. A control panel that is located in a grain elevator would need to have an EPL of EPL Fb. A lighting fixture that is used in a paint booth would need to have an EPL of EPL Ga. III. Explosive Atmosphere – An explosive atmosphere is a combination of air and combustible materials concentrated enough to ignite quickly and violently. For instance: One place where an explosive environment may be present is a grain elevator. Grain dust is an easily ignited combustible substance. Grain dust has the potential to erupt in the air if it is present in high enough concentration. Reference: CSA C22.1:21 Canadian Electrical Code, Part I, Section 18.

4 There are two types of possible explosive environments. One of them is a gas or vapour atmosphere which contains flammable gases or vapours which includes flammable gases and vapours which are methane, propane, and petrol. Another is Dusty atmospheres like environments where combustible dusts are present. Wood dust, sugar dust, and grain dust are a few types of combustible dusts. There are explosive environments in many different sectors, such as: Gas and oil: pipelines, gas plants and oil refineries. Chemicals: transportation, storage, and chemical plants. Food and beverage: Grain elevators, flour mills, and sugar refineries. Woodworking: Sawmills, woodworking shops, and furniture factories. Agriculture: Grain storage facilities, barns, and feed mills. IV. Flammable limits: Flammable limits, also known as explosive limits, are the concentration ranges of a flammable gas or vapor in air that will burn or explode when ignited. These limits are typically expressed as a percentage of the flammable gas or vapor in air by volume. For example: The lower flammable limit (LFL) is the minimum concentration of a flammable gas or vapor in air that will burn or explode when ignited. The upper flammable limit (UFL) is the maximum concentration of a flammable gas or vapor in air that will burn or explode when ignited. For example, the LFL of methane in air is 5.0% and the UFL is 15.0%. This means that a mixture of 5.0% to 15.0% methane in air will burn or explode when ignited. Reference’s C22.1:21 Canadian Electrical Code, Part I, Section 18, Subsection 18-2

Your preview ends here

Eager to read complete document? Join bartleby learn and gain access to the full version