Electrician (ELE)

Fourth Period Package (42 Modules) Comments

Date: 4/20/2020 2:45:02 PM
Module: 030401c
Version: 21
Page: 36-37
Comment: The differential compound motor is noted as a motor used when a "nearly constant speed" is required. This is only true when operating at near full load, from no load to full load the overall speed regulation of a shunt motor is better than a differential compound but the speed curve of the differential is almost perfectly flat at near full load. I think this is confusing to students and could be explained better. Adding the differential compound motors speed curve to figure 37 and the torque curve to figure 38 would also be helpful.
Status: Approved for Review

Date: 3/8/2020 7:40:49 AM
Module: 030401e
Version: 21
Page: 14
Comment: The first bullet point at the top pf page 14 that states the value of current is determined by the resultant voltage (Eresultant) is fundamentally incorrect as well as the formula at the bottom of figure 9 on that same page. This machine at the end of the day is still just a motor and has to follow the principles of Kirchhoffs voltage law. What the modules refers to as Vphase is the applied voltage from the source therefore the voltages Eresultant + Egenerated = Vphase. This is stated in every textbook that describes synchronous motors. This ILM is the only reference that ever makes this statement and that is because it is wrong. This also make all of the phasor diagrams that follow incorrect. The generated voltage will lag Vpahse by the torque angle which will again prove KVL and also aline with every other text out there.
Status: Approved for Review

Date: 3/8/2020 7:41:05 AM
Module: 030401e
Version: 21
Page: 18
Comment: The answer to question four is incorrect. Although this is how it is explained throughout this module it is fundamentally way off. If context is need please see Electrical Machines, Drives, and Power Systems text by Theodore Wildi, page 382.
Status: Approved for Review

Date: 5/31/2019 11:16:28 PM
Module: 030405a
Version: 12
Page: 24
Comment: Would you please check on the DCF (Table D3) formula and add clarification to the ILM as to whether you use the rated conductor temperature or the Conductor allowable ampacity, based on termination temperature. The Masters course offered by NAIT uses Termination Temperature to determine the conductor ampacity and this makes sense based on rule 4-006. Our ILM uses the 90 deg ampacity based on Table 2, yet gives termination temperature of 75 deg 0
Status: Approved for Review

Date: 2/13/2020 8:22:47 AM
Module: 030405a
Version: 21
Page: Throughout
Comment: 030405a Conductors – Section 4 • Objective 1, Figure 2 – Should say “Ampacity = Table 1 Value…” (145 A is correct). • Objective 1, Example #3 (p.6, 7) –Add to picture for Panel board to wall greater than 1.2m. Also add from JB to wall greater than 1.2 m. • Objective 1, Example #4 (p.7) – Add to question 1.2 meters from panelboard to area and 1.2 meters at least from area to equipment. Or Change the question to below (from RW 90 conductor) TW 75 wire and Solution should indicate that the ampacity is reduced from the 75o degree column of Table 5A according to insulation: 80 A ÷ 0.75 = 106.6 A. Select a conductor from the 75o degree column of Table 2. A No. 2 AWG would be selected: 115 A x 0.75 = 86.2 A. A No 2 AWG with an allowable ampacity of 86.2 is acceptable for the 80 A load. • Objective 1 Exercise, Q.3 – Add 1.2 meters out of ambient area on either end of the conductor or Change questions to Conductor to (from RW 90) TW 75 Then change answer to #3 AWG. • Objective 2, Example (p. 14) Add based on service OC before Table 16 at bottom of page 14 • Objective 3, (p. 18) 4th line down add underline portion 4-008 1) c) 2) and 4-008 Appendix B • Objective 3 Title for Figure 9 should be changed to underline Figure 9 – Flow chart based on Rules 4-004, 4-006, 4-008 1) 2), and 4-008 Appendix B and Appendix D. • Objective 4, (p.21) Third paragraph down after Voltage Drop. Change last sentence to underlined. Table D4 is handy when applying Rule 46-306 for the remote lamps of unit equipment. • Objective 4, Example #2 (p.22) – Assume all equipment has 90o ratings. • Objective 4, Example #3 (p.24) – A #1 AWG has an allowable ampacity of 130 A at 75o.
Status: Approved for Review

Date: 2/13/2020 8:22:22 AM
Module: 030405b
Version: 21
Page: Throughout
Comment: 030405b Grounding and Bonding and Distribution Layout – Section 10 • Objective 1, p. 2 – Figure 1 delete Circuit from picture Circuit grounding. Leave in just Grounding. • Objective 1, p.12 – The second bullet point should read “connect the grounded conductor…” • Objective 1, Figure 13 – Cross-out “Bonding Screw Installed” text in top left of diagram.
Status: Approved for Review

Date: 5/31/2019 11:16:29 PM
Module: 030405d
Version: 12
Page: 4
Comment: first sentance of page 4 reads If a conductor is 3m or less and fulfills the requirements of Rule 14-100(c), it may be smaller than required by Rule 14-100(b) and still be acceptable. if we are going to make a statement like this an example would have to be provided to back this up as this is a very unlikely event and may cause confusion for student
Status: Approved for Review

Date: 12/2/2019 3:51:39 PM
Module: 030405e
Version: 21
Page: 40
Comment: The answer to Question 1 should be FT6, not FT4. According to 2-130 Appendix B, FT4 rated conductor is suitable for combustible and non-combustible buildings. FT6 is also rated for the above-mentioned construction and may be used in a plenum as the question mentions. Consider supplying code rule and reference to the appendix as feedback for the question.
Status: Approved for Review

Date: 5/31/2019 11:16:29 PM
Module: 030405g
Version: 12
Page: 5
Comment: First paragraph line five states subrule (2) subrule(3) should be subrule (3) subrule(4)
Status: Approved for Review

Date: 5/31/2019 11:16:30 PM
Module: 030405g
Version: 12
Page: 16
Comment: second paragraph line 2 states a no. 10AWG 90C conductors has an allowable ampacity of 35 A A No 10 AWG from the 75 degree colomn has an allowable ampacity of 35A from the 90 degree colomn the allowable ampacity is 40A Suggest changing too- from the 75 degree colomn the allowable ampacity for the No. !0 AWG 90 degree would be 35A
Status: Approved for Review

Date: 10/22/2019 11:04:59 AM
Module: 030405g
Version: 21
Page: 19
Comment: The code rule in the second paragraph needs to be changed from 8-104 5) a) to 8-104 6) a)
Status: Approved for Review

Date: 10/11/2019 3:15:56 PM
Module: 030405h
Version: 21.0
Page: 21
Comment: For the service calculation, everything is correct with the calculations. The issue is we should be saying T-4 and T-39 both use a 4/0awg with a 200A service. By just mentioning T-4 you may assume T-39 is not considered. If I’m incorrect in my interpretation please get back to me.
Status: Approved for Review

Date: 2/5/2020 12:25:42 PM
Module: 030405h
Version: 21
Page: 7
Comment: In the heading for row housing.....it should refer to 8-200 2) not 8-202 2)
Status: Approved for Review

Date: 2/5/2020 12:26:00 PM
Module: 030405h
Version: 21
Page: 5
Comment: On page , for step 8 add information. Add rule 4-004 22) appendix B and include information that in order to use Table 39 ...markings and labels are required on the equipment to allow you to use Table 39. If no labels must use 14-104 and table 13 and table 2.
Status: Approved for Review

Date: 5/31/2019 11:16:30 PM
Module: 030405i
Version: 14
Page: 24
Comment: 3rd paragraph If locked rotor current is not listed on the equipment nameplate, it is assumed to be six times the full load current rating. (we do not have to assume cec gives us a value to use) should read If locked rotor current is not listed on the equipment Refer to Rule 28-010 Locked rotor current rating where not marked, deemed to be equal to six times the FLA rating from the nameplate
Status: Approved for Review

Date: 11/12/2019 12:07:15 PM
Module: 030405n
Version: 21
Page: 12
Comment: When listing the two types of insulation shielding, bullet 1 "Non-metallic insulating shielding" is italicized while bullet 2 is not. Make consistent.
Status: Approved for Review

Date: 11/12/2019 12:07:30 PM
Module: 030405n
Version: 21
Page: 26-35
Comment: Objective 5 has many formatting errors.
Status: Approved for Review

Date: 5/31/2019 11:16:30 PM
Module: 304051
Version: 12
Page: 20
Comment: Question 5, obj. 2 The term 'may be' denotes permission to do something. The given answer is False for this question. It should be True. You may install equipment approved for Class1, Div 1 locations in a Zone 0. The question does not state any requirements. So, as long as specific requirements are met, YOU MAY INSTALL class1 div 1 equipment in zone 0
Status: Approved for Review


Archived Comments

There are no archived comments to view for this package.