Electrical Service Design Lab
Video Demonstration for OBE assessment
Student Name: Nur Mohammad Akram
ID: 18-39027-3
Section:
D
Submission Date: 02-12-2021
Dept: EEE
Semester: Fall 2021-22
Marking Rubrics 1 for assessing CO1 [P.c.3.C4] (to be filled by faculty)
Markings
Excellent [3]
Acceptable [2]
Inadequate [1]
No response [0]
Major
design
requirements
are
identified.
Basic
design
strategy is
defined.
Partial
design N/A
essentials are listed
with no
design
strategy is defined.
Secured Marks
Points
All
design
requirements
are
clearly
identified
and proposed. A
detail
design
strategy is defined.
are
Public health issues All constrains
fully taken
into
considerations
and
identified with
a
comprehensive
explanation
Most of the issues
Safety issues
are identified
wit
h
properofexplanation
Most
the issues
Society issues
are identified
wit
h
proper
Most ofexplanation
the issues
Environmental
are identified
issues
wit
h
proper explanation
Type of wire
Not all but
major Only
partial N/A
of
constraints
are consideration
design
constraints
considered. But not
fully integrated with
design.
Moderate amount of
issues is identified
with
minimum
explanation
Moderate amount of
issues is identified
with
minimum
explanation
Moderate amount of
issues is identified
with
minimum
explanation
Least amount
of N/A
issues is
identified
with no
proper
explanation
Least amount
of N/A
issues is
identified
with no
proper
explanation
Least amount
of N/A
issues is
identified
with no
proper
explanation
Total =
Out of 15
Marking Rubrics 2 for assessing CO2 [P.f.1.A3] (to be filled by faculty)
Markings
Excellent [3]
Acceptable [2]
Inadequate [1]
No response [0]
Exact calculation
of current has done
before selecting
wire AWG. Proper
method of
calculation is
followed
Nearly correct
calculation is used
to identify the wire
AWG
Wrong calculation
with incorrect
method is used to
identify wire AWG
N/A
Wire classification Different type of
wire classification
is shown. Clear
explanation is used
to identify wires
for branch circuit
Several type of
wire classifications
points out but
explanation is not
proper during
selection
Least amount of
wire classification
with no
explanation
N/A
Average Market
research
Market research
does not reflect
anything
meaningful
N/A
Safety percussions Most of the issues
are identified with
proper explanation
Moderate amount
of issues is
identified with
minimum
explanation
Least amount of
issues is identified
with no proper
explanation
N/A
Most of the issues
are identified with
proper explanation
Moderate amount
of issues is
identified with
minimum
explanation
Least amount of
issues is identified
with no proper
explanation
N/A
Points
Wire selection
Market research
Health issues
during setup
Immense market
research has been
done for wires
availability
Secured
Marks
Total =
Out of 15
Question: Analyze a plan for feeder and branch circuit wiring incase of AIUB. For feeder circuit
wiring please address these issues like type of wire, public health issues, safety issues, societal and
environmental issues as well. For branch circuit wiring, selection procedure is little bit different than
the feeder circuit. You need to focus in these topics like wire selection, classification, market
research, safety percussion and health issue as well. Please make a power point presentation along
with a clear video demonstration and send the link of your demonstration in my mail.
Single line diagram for 400v AC power Distribution
General Notes:
➢
The conductor system by means of which electric power is conveyed from a generating
station to the consumer’s premises may, in general, be divided into two distinct parts i.e.
transmission system and distribution system.
➢
Each part can again be sub-divided into two: primary transmission and secondary
transmission and similarly, primary distribution and secondary distribution and then finally
the system of supply to individual consumers. A typical layout of a generating,
transmission and distribution network of a large system would be made up of elements as
shown by a single-line although it has to be realized that one or more of these elements may
be missing in any particular system.
➢
For example, in a certain system, there may be no secondary transmission and in another
case, when the generating station is nearby, there may be no transmission and the
distribution system proper may begin at the generator bus-bars.
➢
Now-a-days, generation and transmission is almost exclusively three-phase. The
secondary transmission is also 3-phase whereas the distribution to the ultimate customer
may be 3-phase or single- phase depending upon the requirements of the customers.
➢ Taking the generated voltage as 11 kV, the 3-phase transformers step it up to 132 kV as
shown. Primary or high-voltage transmission is carried out at 132 kV*.
➢
The transmission voltage is, to a very large extent, determined by economic
considerations. High voltage transmission requires conductors of smaller cross-section
which results in economy of copper or aluminium. But at the same time cost of insulating
the line and other expenses are increased.
➢
The secondary distribution is done at 400/230 V for which purpose voltage is reduced
from 3.3 kV to 400 V at the distribution substations. Feeders radiating from distribution
substation supply power to distribution networks in their respective areas.
➢ If the distribution network happens to be at a great distance from substation, then they are
supplied from the secondaries of distribution transformers which are either pole-mounted
or else housed in kiosks at suitable points of the distribution networks.
➢
The most common system for secondary distribution is 400/230-V, 3-phase 4-wire
system. The single-phase residential lighting load is connected between any one line and
the neutral whereas 3-phase, 400-V motor load is connected across 3-phase lines directly.
It should be noted that low-voltage distribution system is sub-divided into feeders,
distributors and service mains.
➢
➢
No consumer is given direct connection from the feeders, instead consumers are
connected to distribution network through their service mains. The A.C. distributors are,
in many ways, similar to the D.C. distributors as regards their constructional details and
restrictions on drops in voltage.
Public health issues:
The first step toward protecting yourself is recognizing the many hazards you face on the job. To
do this, we must know which situations can place you in danger. Knowing where to look helps
you to recognize hazards.
+ Inadequate wiring is dangerous.
+ Exposed electrical parts are dangerous.
+ Overhead powerlines are dangerous.
+ Wires with bad insulation can give you a shock.
+ Electrical systems and tools that are not grounded or double-insulated are dangerous.
+ Overloaded circuits are dangerous.
+ Damaged power tools and equipment are electrical hazards.
+ Using the wrong PPE is dangerous. + Using
the wrong tool is dangerous. + Some on-site
chemicals are harmful. + Defective ladders and
scaffolding are dangerous.
+ Ladders that conduct electricity are dangerous.
+ Electrical hazards can be made worse if the worker, location, or equipment is wet.
Safety issues : A safe work environment is not enough to control all electrical hazards. You
must also work safely. Safe work practices help you control your risk of injury or death from
workplace hazards. If you are working on electrical circuits or with electrical tools and
equipment, you need to use safe work practices.
Circuit Diagram:
Symbol Blocks:
Schematic Library Symbols
Below is an illustrated listing of the schematic symbols (along with the
appropriate block name) supplied with AutoCAD Electrical. The schematic
symbols are illustrated here along with the appropriate block name.
Push Buttons
Illuminated Push Buttons
Selector Switches
Selector Switches (continued)
Illuminated Selector Switches
Limit Switches
Pressure Switches
Temperature Switches
Flow Switches
Level Switches
Proximity Switches
Photo Eyes
Power Distribution Blocks
Timers
Relays