In order to pass your electrical exam you need to be able to answer calculation questions with ease. Can you answer the following question?
What is the general lighting demand load volt-amps for a 30 unit apartment building supplied by a 240v/120v single-phase source if each apartment measures 1,600 sq.ft.?
Solution:
Step #1 Calculate Connected Load
3 va x 1,600 sq.ft. x 30 units = 144,000 va
2 small appliance branch circuits x 1500 va x 30 units = 90,000 va
1 laundry circuit x 1500 va x 30 units = 45,000 va
Connected load total =279,000 va
Step #2 Calculate Demand Load
1st 3,000 va @ 100% = 3,000 va
Next 117,000 va @ 35% = 40,950 va
Remaining 159,000 va @ 25% = 39,750 va
Demand load total = 83,700 va
To answer this question you’ll need to know:
The difference between a connected load verses a demand load.
Which code articles apply and how to find them using indexed key words.
How to answer this question correctly within 1.5 to 2 minutes on the exam.
Preparation is the key to being able to answer these kinds of questions quickly and easily. We’ll help you to understand exam question terminology and develop the test taking skills you’ll need to succeed. Call 888-919-3926 to start preparing to pass your exam today.