RT Guidelines:
Want an RT Box Pad from Nordic Fiberglass?

Fill out our transformer dimension worksheet and send it to us.

 Top view of the box pad shown below with an outline of a transformer at the maximum and minimum allowable footprint.

• Nordic RT’s (reinforced tops) are fiberglass box pads that are reinforced by encapsulating CDX exterior grade plywood on the top surface and encapsulated 2x4’s on the underside in order to support a variety of three phase transformers. 
• Each RT is designed to support a three phase transformer that weighs up to a maximum of 10,000 pounds. The recommended RT is based on the particular transformer that will be placed on it.
• For example, if a three phase transformer had a dimension of 66”W x 50”D, and an RT had dimensions of 72”W x 56”D, this RT would be able to accommodate the transformer. 
• The minimum allowable surface area that this RT will accommodate is 66” W (72”-6”) and 50”D (56”-6”). See Figure 1. 
• Any transformer that has a footprint greater than 3” in on all sides would have to be evaluated by Nordic. 
• Also remember to check the weight of the transformer. Nordic needs this information because the weight of the oil tank can be configured in different areas of the transformer and additional reinforcement could be required to support it. 
• We currently manufacture box pads for three phase transformers that weigh in excess of 10,000 lbs., however, we require a footprint before a quotation can be made.
• For proper warranty coverage, Nordic reserves the right to require a footprint for a transformer before the RT box pad will be manufactured and shipped
   
• The RT-2O is designed in the same fashion as the RT in regards to fitting the oil-filled switch to the box pad .
• However, on the RT2O, the box pad is designed with 2 centered top openings to meet the openings on the switch base (See Figure 2). 
• In this top view example, the GS-86-78-36RT-2O-MG-202320-64 is used to show the following dimensions . GS=Ground Sleeve, 86= 86” top surface width (A), 78= 78” top surface depth (B), 36= 36” box pad height, RT=, Reinforced Top, 2O= 2 top openings, MG= Munsell Green, 20= left side top opening width (C), 34= distance between top openings (D), 20=right side top opening width (E), and 64= top opening depth (F).
•  A footprint of the switch will need to be forwarded with the order to ensure the proper placement of the openings.
• Fill out our oil-filled switchgear dimension worksheet and send it to us.

For air insulated switches, additional reinforcement is not required. Placement of the switchgear is important. The light green area as seen in figure 3 is the safe area to place a switch on top of the box pad example. The minimum allowable switch placement is 2” in from the outside surface area of the box pad. The “red” area is too close to the middle of the box pad.

Fill out our air-filled switchgear dimension worksheet and send it to us.