Exam (elaborations)
26401 Load Calculations - Feeders and Services Exam Questions And Accurate Answers
- Course
- Institution
26401 Load Calculations - Feeders and Services Exam Questions And Accurate Answers...
[Show more]
Content preview
26401 Load Calculations - Feeders and Services 2024-2025 ExamQuestions And Accurate Answers
Load calculated at 2 circuit 1500VA. - Answer Small Appliance Ciruit
Voltage drop formula 1
VD = (2*L*R*I)/1,000 - Answer VD = voltage drop (in volts)
L = load center or total length in feet
R = conductor resistance per NEC Chapter 9, Table 8
I = current
The number 1,000 represents 1,000' or less of conductor.
Show window loads should be calculated at _____ per linear foot of show window. -
Answer 200VA
What is the minimum demand for that part of a feeder which serves 30' of show windows?
6,000 VA
5,400 VA
3,000 VA
2,700 VA - Answer ft x va = va
30ft x 200VA = 6,000VA
NEC 220.14(C)(2)
At 200 Volt-amperes per linear 300 mm (1 ft) of show window
Voltage drop formula 2
VD = (2*L*K*I)/CM - Answer VD = voltage drop
, L = load center or total length in feet
K= constant (12.9 for copper conductors; 21.2 for aluminum conductors)
I = current
CM= area of the conductor in circular mils (from NEC Chapter 9, Table 8)
Feeder conductor size is adjusted when?
The load supplied is a continuous-duty load.
More than three current-carrying conductors are in a raceway.
The ambient temperature surrounding conductors exceeds temperature ratings.
Voltage drop exceeds 3% for feeders or 5% for the combination of the feeder and branch
circuit.
All of the above - Answer All of those above
In calculating feeder-circuit conductors, if noncontinuous loads equal 450 amperes and
continuous loads equal 550 amperes, what is the total calculated feeder load that the
conductors must handle?
A. 1137.50 amperes
B. 1100 amperes
C. 950 amperes
D. 1317.50 amperes - Answer In order to calculate the total feeder load, you must add
100% of noncontinuous loads to 125% of continuous loads.
450 + (1.25 × 550) = 1137.50 amperes
For a tap from a 400A, 480V, 3Phase feeder, using the 25' tap rule, what is the minimum
size copper THWN conductor required?
1/0
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Easton. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $12.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
79650 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now