FAQ

11
Material taken from the National Electric Code
®
is reprinted with permission
from NFPA 70
®
, 2023 edition. National Electrical Code
®
, Copyright 2022,
National Fire Protection Association, Quincy, MA. All rights reserved.
Material taken from the National Electric Code
®
is reprinted with permission
from NFPA 70
®
, 2023 edition. National Electrical Code
®
, Copyright 2022,
National Fire Protection Association, Quincy, MA. All rights reserved.
Revision
100 Definitions
Change Summary
• All definitions will now be located in Article 100.
In previous code cycles, definitions could be found
throughout the code. In addition, and as a result,
the subdivisions within Articles were removed.
NEC
®
Text
100 Denitions
Part I. General.
Part II. Over 1000 Volts, Nominal.
Part III. Hazardous (Classied) Locations. (CMP14)
Expert Analysis
A revision has been made to the scope of Article 100
and modified by removing language for those terms
used in two or more articles.
This revision now requires all definitions in one location
and the changes to the scope reflect these changes.
New
100 Definition – Class 4 Circuits
Change Summary
• Definition of Class 4 circuits has been added to
the NEC. Class 4 circuits are new, and the definition
correlates with new article 726 – Class 4 Power Systems.
NEC
®
Text
100 Denitions
Class 4 Circuit. The portion of the wiring system between
the load side of a Class 4 transmitter and the Class 4 receiver
or Class 4 utilization equipment, as appropriate. Due to the
active monitoring and control of the voltage and current
provided, a Class 4 circuit considers safety from a re
initiation standpoint and provides acceptable protection from
electric shock. (726) (CMP-3)
Informational Note: A Class 4 circuit is also commonly referred to
as a fault-managed power circuit.
Expert Analysis
The NEC previously addressed Class 1, 2 and 3 Power
systems and now the new Class 4 Power System.
There is more info given in the NEC to include Cass 4
continued on page 12