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There are three compartments within each vertical section: the breaker or control compartment located in the front area, the bus compartment located in the middle area and the outgoing or incoming cable compartment located in the rear area.

 

Breaker/Control Compartment
The breaker compartments will consist of up to four breakers in any order with any ampere rating but not to exceed 5,000 amps. The control compartment is where potential transformers, fuse blocks, terminal and shorting blocks, and auxiliary relays are mounted.

The vertical sections can hold up to four individual breaker or control compartments which are isolated from the bus compartment.

Bus Compartment
This compartment contains a copper or aluminum bus bar. This is where the main, vertical, line and load buses are located. The main bus is fully rated throughout and is not tapered.

The bus joints are bolted and torqued for maximum integrity, with connections of either either silver or tin plate. As an option, the bus can be sleeved with PVC, epoxy or heat shrink tubing for insulation. Myers specializes in custom bus work inside the bus compartment.

The bus and cable compartments are in an open area, but a rear barrier can be provided to isolate the bus compartment from the cable compartment.

Cable Compartment
This is where the cable enters or exits the switchgear from either the top or the bottom. The incoming cable connects to the line side of the main device or to the bus bar that is connected to the line side of the main device. A ground bus is located in the bottom of this compartment and runs though the full length of the switchgear.


Front view inside a 4-high 480 volt, 800A drawout feeder air circuit breakers in an Outdoor Walkin 480V Metal Enclosed Switchgear.


Rear bus compartment for an Outdoor Walkin 480V Metal Enclosed Switchgear.

The vertical sections vary in depth due to either a large portion of incoming or outgoing cables or specially-designed custom bus work. Myers can provide full height hinged rear doors or bolted rear covers.

Our LV metal-enclosed switchgear is available for outdoor applications to meet NEMA 3R Non-walk-in or Walk-in type enclosures.

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