Nordic Fiberglass Inc.
 PO Box 27
 Warren,  MN 56762
Ph: 218-745-5095 
Fx: 218-745-4990
E-mail: sales
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Made in the USA

Proposed Specifications for Fiberglass Box Pads

MATERIALS
RESIN - To be polyester thermosetting and tested for flammability under ASTM D635 with rating to be self-extinguishing and with extent of burning not to be over 12mm nor average time burning to be over eighty seconds on test.

FIBERGLASS used will be a combination of chopped glass with a minimum of one layer throughout of 18 ounce or 510 gram woven roving so as to form a continuous filament from top to bottom and from one side to the other for maximum strength.

GELCOAT – The exterior surface shall be coated with a polyester base gel coat or surface coat that will provide maximum protection from UV light and weathering. Test data results from DSET Laboratories using the EMMAQUA Test Method with the results of the equivalent of two standard ultra-violet light years showing no change in Fiber Show or Fiber Bloom and no worse than a “Good” rating on General Appearance and Color Change. An alternate test for UV resistance can be the ASTM-G-70 test method with a maximum of change of 2.3 Macadam Units after one thousand hours of exposure in a Model 65WR Atlas Weatherometer.

PHYSICALS
Box Pads shall be manufactured in one piece and designed to nest within six inches or 152 mm of each other for suitable handling and storage. The base should have a flange measuring a minimum of 3 ½” or 89 mm to provide a stable base when the Box Pad is installed. Edge rounding between the top surface and sidewalls shall have a radius of not less than ¼ inch or 6.35 mm not more than 5/8 inch or 12.7 mm. The Box Pad should have no sharp or rough edges that might be harmful to cables.
 The Box Pad should be designed to withstand a drop of five feet or 1524 mm during handling and hard blows from a one-pound or 454 gram hammer without significant damage.
 

Proposed Specifications for CBP (Compression Box Pad) Series Box Pads

MATERIALS

RESIN - The CBP Series Box Pads are made up of a neat Isophthalic-Neopentyl Glycol polyester thermosetting resin with a minimum of .15% UV absorber based on the resin matrix.

COLOR - CBP box pads shall be pigmented Munsell Green with a minimum pigment loading of 2% based on the resin matrix. The UV absorber and pigment shall be permanently molded in throughout the laminate.

FIBERGLASS - The box pad shall have a minimum glass loading of 30% based on the total weight of the formulation. The laminate shall have a minimum thickness of 3/16”. 

FIRE RETARDANCE - The box pad shall have a fire retardance rating comparable to no less than UL-94-V1.

PHYSICALS

MANUFACTURING PROCESS - The box pads shall be composed of a fiberglass sheet molded material using a match metal tool that produces a complete one-piece unit. The company name and logo along with the part number and year of manufacture will be permanently molded into the top surface of the box pad.

PHYSICAL DIMENSIONS - Designed to accommodate padmount transformers from 25 kVA to 167 kVA. Six stainless steel floating nut assemblies will be standard. The floating nut assembly can be easily replaced in the event that an insert is damaged. The insert shall be able to withstand a torque of 30 foot pounds when applied to a simulated transformer installation and cover installation. The insert will also withstand up to 750 lbs. of pullout tension. The base shall have a flange measuring a minimum of 3 1/2” to provide a stable base when the box pad is installed. The radius on the top surface to the sidewalls shall not be less than 1/4” nor more than 5/8”. 

PHYSICAL CHARACTERISTICS - The CBP box pads should have no rough or sharp edges that might be harmful to cable or personnel. 

WEIGHT LOADING - The CBP box pads shall be in compliance with the Short Term NEUC guidelines for transformer loading strength and deflection tests. These tests call for no more than 3/16” deflection at 50% of load on the TLF-2, 3, or 4 test frames.

SIDEWALL STRENGTH - The sidewalls shall have ribs molded in for greater sidewall strength. The box pad shall be in compliance with the NEUC specification for sidewall deflection. This test calls for deflection not to exceed 5% of the sidewall length.