GE Products BuyLog Smart Catalog

Modular Metering

Section 2

Applications Where Center-Feeding Main Module is Required

SUITABLE FOR CENTER-FEED APPLICATIONS ONLY † † Horizontal bus is rated 1200 amps maximum. The load on the horizon- tal bus may not exceed 1200 amps in either direction from the point of connection of the main circuit breaker. Overall load is limited to the rating of the main circuit breaker.

For applications where the main module ampere rating is greater than that of the meter stack horizontal bus, the main module must be placed in the middle of the lineup (Figure A). The engineer of record must provide calculations on the plans to show that the horizontal bussing will not be overloaded on either side. This situation, called “Center-Feeding”, can happen in either 800A or 1200A horizontal bus meter stack applications, depending on the main ampere rating. Refer to chart below for amperage and bus information. NOTE: Figure B shows the incorrect configurations.

Does the Application Require Electrician to Center-Feed the Main Module?

Amps of Main Breaker, Lug or Switch

800A Horizontal Bus

1200 Horizontal Bus

400A – 800A

No

No No

1000A

Yes

1200A

Yes

No

1400A

Yes

Yes

1600A

Yes

Yes

2000A

Yes

Yes

Main ain

Main

Main

Correct This configuration is centered and will balance the load between left and right-side horizontal bus leaving the main section

Incorrect This configuration will overload the left-side horizontal bus that leaves the main section

Incorrect This configuration will overload the right-side horizontal bus that leaves the main section

Figure A

Figure B

Rev. 1/19 Data subject to change without notice

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