NEMA 3R Bus Secondary

NEMA 3R CNP Bus Secondary Tapbox




Center Point Energy Bus Secondary Tap Box is constructed of 12 Gauge Steel, primed with gray- oxide and enamel painted inside and out with Sherwin Williams ANSI-70, Light-Dove Grey.

Tap Box will be dual access. The doors have continuous stainless steel hinge-cover doors with a stainless steel hinge. The doors are secured by a three-point locking mechanism and a T-Handle with provisions for padlocking. An open bottom with a mounting flange is installed. Tap Box is crossed crimp on top of the box.


Steel Bracing @ 100,000 AIC, is installed to receive Phase and Neutral Bars on 3” minimum 600V insulators. 

Buss Bars

CD 110 Silver Plated Copper is used on all Phase bars, Neutral and Ground bars where applicable. Ampacity is determined by one square inch cross section of copper equaling 1,000 Amps. Bars are continuously punched with 9/16 ”holes at 1 3⁄4” each way.


The Tap box has two separate compartments, one side for CNP connections and the other side for customer’s connection. The insulating barriers are to be ” phenolic resin impregnated barrier boards (NEMA Grade N-1 or GPO-3).

Industry Standard

Meets NEMA standard for Type 3R (rainproof and sleet-ice resistant) enclosures. 


Custom sizes available.

Width Height Depth Gauge
36 51 60 12


NEMA 3R CNP Bus Secondary Tapbox