Load Center

Load center is an industry term that applies to the types of panel boards used in residential and light commercial applications. The National Electrical Code® makes no distinction between a panel board and a load center; therefore, rules and definitions that apply to panel boards also apply to load centers.ApplicationUsed to control light, heat, or power circuitsPlaced in a cabinet or cutout boxMounted in or against a wallAccessible only from the frontStandard IEC-61439-3Branch Circuit BreakersBranch circuit breakers fixed directly onto the load center’s supply bus bars as shown in the following illustration.LabelThe label identifies the load center’s catalog number, enclosure type, voltage service and ampere rating. Additional information on the label identifies circuit breaker types that can be used with the load center, short circuit current ratings, and wiring diagrams.Trim Assembly
The trim assembly, sometimes called a dead front, attaches to the front of the load center and covers the interior. The trim assembly includes an access door and an adjustable upper pan. The trim assembly provides access to the circuit breakers while sealing off live parts and internal wiring.Circuit DirectoryA circuit directory on the door, similar to one shown below, provides space for listing the services protected by each branch circuit breaker.Load Center InstallationThe enclosure, with the interior, is mounted to a wall. All incoming and outgoing conductors are connected to the load center.Al asry load centers can be surface or flush mounted. For flush mounting, the load center is positioned so that the front edge of the enclosure is flush with the finished wall. The trim assembly is installed after the wall is finished.Load center installation requires careful planning to ensure a safe environment for personnel and equipment.