The Most Trusted Name in Power Factor Correction and Harmonic Filtering


Share this product page:   

NEPSI's Metal-Enclosed Harmonic Filter Bank enclosures are designed, fabricated, and coated at our plant located in Queensbury, NY. Enclosures are custom designed for the application with standard enclosure features as listed below.

The enclosures are free standing, compartmentalized, having all-welded construction with 3 point pad-lockable latching handles and stainless steel hinges. Doors are of a “flush” door design. The enclosures are painted with Engineered Siloxane, a Marine paint with rated salt spray of 5500 hours. NEMA 3R (IP64) construction is standard; NEMA 12 (IP65) and 4X (IP66) are available as an option. Base of enclosure as well as capacitor supports are formed from C4x5.4 structural steel channel. Door stays and windows are standard.


Sheet Metal
11 Guage Cold Rolled Galvanneal Steel is standard. For highly corrosive environments, stainless steel 304, 316, or 409 can be provided.

Enclosure Base and Component Supports
The entire assembly (including component supports) are constructed on a C4-5.4 structual steel channel such that the complete assembly can be lifted, skidded, slid, or rolled into place on a pad without damage to any portion of the enclosure or its contents. For highly corrosive environments, the structural base is hot-dipped galvanized.

Stainless Steel Weld-on Hinges, also known as barrel hinges and lift-off hinges are provided as standard. Hinges are positioned to allow for removal of the door while in the open position. Hinges have a combined load raing of 1200 pounds ensuring years of trouble free operation.

Enclosures are painted with a high-solid Siloxane Epoxy coating that has a 5500 hour salt spray rating. The paint color can be chosen by the customer or can be one of NEPSI's standard colors. Standard colors include ANSI gray 61 - Munsell No. 8.3G 6.10/0.54, ANSI Gray 70 - Munsell No. 5BG 7.0/0.4, or Green - Munsell No. 7Gy 3.29/1.5. In addition, the inside may be painted white for high visibility during maintenance.

Enclosure doors are of a flush design. Automatic sliding stainless steel doors stays are provided to hold the doors in the open position. Doors are equipped with three point stainless steel latching handles that can be pad-locked.

Fully gasketed windows are provided to view internal components (i.e. fuses) of the bank.

Enclosure Labeling
Enclosures are marked and labled in accordance with IEEE/NEMA standards. Labels identifying component compartments are affixed to the exterior of the enclosure.

Ventilation System
All ventilation louvers are located on the front, side, or rear of the enclosure. Washable, 1 inch (2.54 cm) UL Rated 900, Class 2 high-air-volume aluminum filters are provided as standard. Filters are removable while bank is in operation.


Pentahead Bolts
Pentahead Bolts and other requirements listed ANSI C57.12.28-1988 - Pad Mounted Equipment Enclosure Integrity can be provide in publically accessible areas.

Infrared Sightglass
Infrared SightGlasses are available for viewing internal components. Sightglass is arc-flash tested to a maximum of 40kA in accordance with IEEE C37 and IEC62271-200 standards. NEMA Type 3/12 & IP65 Rated.

Follow us on social media for up-to-date news, videos, and other information: