Skip to content

Electricalterminology

Best Blog for Basic Electrical Knowledge

Primary Menu
  • Electric
  • Manufacturers & Brands
  • Electronics
  • About Us
  • Contact
  • Affiliate Disclosure
  • Home
  • Electric
  • Load Center: Definition, Function, Types, Construction
  • Electric

Load Center: Definition, Function, Types, Construction

electricalterminology 10 months ago
What is a load center

A load center is an electrical distribution panel that is used to distribute power throughout a building or structure. It serves as the main point of distribution for electrical power and controls the flow of electricity to all the electrical circuits in the building. Load centers come in various types and are constructed with different materials to meet the specific needs of the building or structure they are installed in. In this article, we will discuss the definition, function, types, and construction of load centers to help you understand how they work and how to choose the right one for your building.

What is a Load Center?

A load center is a metal-enclosed distribution panel containing circuit breakers that distribute, protect and control lighting and power circuits in residential and light commercial applications, including single-family homes, townhouses, apartment buildings, and small office buildings.

For most people, the home is an investment of a lifetime. It’s no place to compromise on electrical protection. That’s why nearly 40 years ago load centers and circuit breakers changed the way homes were protected replacing fuses with the convenience and safety of modern circuit breakers.

Load centers are typically rated 225 amps or less and 240 volts maximum and are intended for use in residential applications.

According to the NEC® definition, load centers are:

  • Used to control light, heat, or power circuits.
  • Placed in a cabinet or cutout box.
  • Mounted in or against a wall.
  • Accessible only from the front.

Load center has been called different names over the years—for example, a fuse box, breaker box, panelboard, or distribution panel.

Types of Load Centers

There are two types of load centers, the main breaker type, and the main lug type.

1. Main breaker load center

Main breaker load centers are suitable for use in service entrance applications. The incoming supply cables of the main breaker type load center are connected to the main breaker which in turn feeds power to the load center and its branch circuits. The main breaker disconnects power from the load center and provides overcurrent protection.

Main breaker load center

2. Main lug type load center

A main lug-type load center does not have a main circuit breaker. The incoming supply cables are connected directly to the main lugs and bus bars. Primary overload protection for the load center is not provided as an integral part of the load center. Main lug units are primarily used as a distribution panel where there is a main breaker upstream in the system. There are situations where a back-fed circuit breaker and a retainer clip (required by NEC®) are used to convert a main lug load center to the main breaker load center.

Main lug type load center

Main lug load centers are sometimes referred to as add-on, secondary or downstream panels. These panels are added when all circuit slots in the main breaker load center are full or when a remote panel is desired. For example, the main breaker load center might supply power to a main lug load center located in an area of the home used as a workshop. Main lug load centers are also fed from metering equipment when used in apartment installations.

Load center location

Load Center Construction

There are several components that make up a load center. Load centers consist of an enclosure, interior, and trim.

1. Enclosure

The enclosure is typically cold-rolled (for indoor use) or galvanized steel (for outdoor use) and houses the other components. It is designed to provide component and personnel protection. Knockouts are provided to allow the user to install conduit or cabling as required. Approved cable clamps or conduit hubs are used in the holes to secure and protect the cable and conductors.

Enclosure

2. Interior

The interior consists of several components, including bus bars and neutral bars. Branch circuit breakers are fields added at the time of installation.

Interior

3. Trim

The trim assembly (dead front) is the front portion of the load center that covers the interior. The trim includes an access door and an adjustable upper pan. The trim/door provides access to the overcurrent devices while sealing off live parts and internal wiring from contact.

Trim

Continue Reading

Previous: Essential Guide to Arc Fault Circuit Interrupters: From A to Z
Next: 12 Examples of Static Electricity in Everyday Life

Related Stories

Arc Flash Relay Essential Guide to Arc Flash Relays and Protection
  • Electric

Essential Guide to Arc Flash Relays and Protection

electricalterminology 2 weeks ago
Dual Function Circuit Interrupter From A to Z: Dual Function Circuit Interrupters
  • Electric

From A to Z: Dual Function Circuit Interrupters

electricalterminology 3 weeks ago
Advantages and Disadvantages of Incandescent Lamps Advantages and Disadvantages of Incandescent Lamps
  • Electric

Advantages and Disadvantages of Incandescent Lamps

electricalterminology 1 month ago
VFD Parts and Functions VFD Parts: A Guide to Their Essential Functions
  • Electric

VFD Parts: A Guide to Their Essential Functions

electricalterminology 1 month ago
Applications of 3 Phase Induction Motors in Industries Applications of 3-Phase Induction Motors in Industries
  • Electric

Applications of 3-Phase Induction Motors in Industries

electricalterminology 1 month ago
Advantages of DC Motors Advantages of DC Motors: Power and Performance
  • Electric

Advantages of DC Motors: Power and Performance

electricalterminology 1 month ago

Posts List

Advantages of Transducers Advantages of Transducers for Optimal Measurement

Advantages of Transducers for Optimal Measurement

Advantages of Infrared Sensors Advantages of Infrared Sensors: Improved Accuracy and More

Advantages of Infrared Sensors: Improved Accuracy and More

VFD Faults Causes Prevention Techniques VFD Faults: Causes and Prevention Techniques

VFD Faults: Causes and Prevention Techniques

Advantages of PCB Advantages of PCB (Printed Circuit Board) in Electronics

Advantages of PCB (Printed Circuit Board) in Electronics

Diode Failures Causes Prevention Tips Diode Failures: Causes & Prevention Tips

Diode Failures: Causes & Prevention Tips

PLC Selection PLC Selection 101: Tips and Tricks for a Successful Choice

PLC Selection 101: Tips and Tricks for a Successful Choice

Categories

  • Electric
  • Electronics
  • Manufacturers & Brands
  • Uncategorized

Pages

  • About Us
  • Affiliate Disclosure
  • Contact

Recent Posts

  • Essential Guide to Arc Flash Relays and Protection
  • From A to Z: Dual Function Circuit Interrupters
  • Advantages of Transducers for Optimal Measurement
  • Advantages of Infrared Sensors: Improved Accuracy and More
  • Advantages and Disadvantages of Incandescent Lamps
Copyright © All rights reserved. | Magnitude by AF themes.