Knowing the difference between calculating general lighting branch circuit loads for continuous vs noncontinuous circuits can make all the difference in passing your master or journeyman electrician’s exam.
Step One:
You need to know the code definition of a continuous load.
According to NFPA 70 a continuous load is defined as follows:
“A load where the maximum current is expected to continue for three hours or more.”
Step Two:
You need to know how maximum current continuing for three hours or more affects the circuit. Sustained current flow will produce sustained heat which has to be factored into determining the required circuit conductor ampacity.
Step Three:
You need to know how to determine whether any given occupancy would have continuous vs noncontinuous lighting circuits.
Just ask yourself this question:
‘Did I pay money to enter the occupancy, did I pay money while there or did I have to pay before leaving?’
Even in a church when the plate is passed money exchanges hands so the lighting is considered continuous.
Step Four:
You need to know the code rules for continuous loads per NFPA 70 Article 210.20(A) which requires that branch circuits supplying continuous loads be rated at not less than any noncontinuous load supplied plus 125% of the continuous load.
It takes more than just memorizing questions or even specific code articles to pass your exam. You need to know not only which code to apply but when and how to apply it properly. We can help you prepare to pass your electrical exam on the first try!
We’ll help you to grasp the concepts and develop the test taking skills that will help you to pass the electrical exam. Preparation is the key to success!
Call 888-919-3926 to start preparing to pass your exam today.