- 1900 Electrical Box Definition: A 1900 Electrical Box is defined as a standard 4-inch square electrical switch box, used when a simple switch box is insufficient.
- Types and Capacity: There are regular and deep versions; the regular holds twelve 10 AWG wires, while the deep version offers more space.
- Design and Dimensions: These boxes have a patented design for easy cable removal and reuse. The regular box is 4×4 inches and 1.5 inches deep, while the deep box is 4×4 inches and 2.125 inches deep.
- Historical Background: The name “1900 Box” comes from a part number assigned by the Bossert Company nearly a century ago, not from its cubic inches.
- Applications: The 1900 Electrical Box is used for installations requiring higher volume boxes, flexible armored cables, and for mounting lighting fixtures, switches, or receptacles.
What is a 1900 Electrical Box?
A 1900 Electrical Box is defined as a standard 4 inches (4’’) square electrical switch box which is the combination of a gas and electrical box. It is the most commonly used box when a simple switch box is not big enough.
There are usually two types of 1900 Electrical Box are available.
- 1900 Electrical Box
- 1900 Deep Electrical Box
Twelve 10 AWG (American Wire Gauge) can be installed in a 4-inch square box with a depth of 
inches.
A key advantage of these boxes is their patented design, which makes cable removal easy and allows the connector to be reused.
1900 Electrical Box Dimensions
The dimensions of both types of 1900 Electrical boxes are given below.
- 1900 Electrical Box is a square box with dimensions of 4 * 4 inches (4’’ * 4’’) square and
inches deep. - 1900 Deep Electrical Box is a square box with dimensions of 4 * 4 inches (4’’ * 4’’) square and inches deep.
A 1900 Electrical Box is constructed from welded steel and features slotted screw heads. It has knockouts on the bottom and sides for 1.5-inch conduit sizes, suitable for use in circuits above or below 250 volts without a bonding jumper.
Where Did the Name 1900 Box Come From?
Many believe the 1900 Box got its name from being 19 cubic inches in size.
But in the catalog of 1917 central electric supply, this 1900 electrical box was referred to as the 1900 combination gas and electric boxes (yes I know that sounds a bit awkward, but see the label print out below).
The name 1900 Electrical Box comes from the part number given by the Bossert Company almost a hundred years ago.
Applications of 1900 Electrical Box
Some of the applications of the 1900 Electrical Boxes are discussed below:
- 1900 Electrical Box is used for a wide variety of applications where bulky wiring devices or heavy cables require a higher volume box.
- 1900 Deep Electrical Box is designed for the installation of flex, MC, MCI, AC, and HCF cables.
- These boxes are suitable to use where the flexible armored cable is being used.
- These boxes are installed in walls or ceilings for lighting fixtures, switches, or receptacles.
- These boxes are suitable for use without a bonding jumper in circuits up to 600 volts.
