Installing and Performing Maintenance on Dual GIC-4 Sensing Cabinets Ɩ
This document describes the processes for installing, wiring, and preparing for maintenance a Dual GIC-4 Sensing Cabinet.
This document may contain; Notices, Cautions or Warnings using ANSI Z535.5 definitions below.
Alert Symbol ANSI Z535.5 definition
NOTICE:
Indicates recommended practices not related to personal injury.
CAUTION: Caution without symbol is used to alert against unsafe practices that can result in property damage only.
CAUTION with symbol: Caution with a symbol indicates a hazardous situation, which, if not avoided could result in minor or moderate injury.
WARNING with symbol: Indicates a potentially hazardous situation, which, if not avoided, can result in injury or serious damage to property.
A notice, caution or warning symbol and its associated message in this document will inform readers of Notices, Cautions, or Warnings.
 Standard Transformer Grounding Cable
© 2015 Dynamic Ratings Specifications and information is subject to change without notice. 1 of 4

Installing and Performing Maintenance on Dual GIC-4 Sensing Cabinets
Ɩ Application Note
Whether a new or retro-fit application the Dual GIC sensing Cabinet should be installed for accessibility, meaning it should be installed at chest level and before the first grounding point on the transformer. o A key consideration is access to a ground cable. Further, the ground cable must be insulated and have a diameter meeting the customers specification. When securing the cable to the transformer, care should be taken to ensure clamps or fixtures do not cut through the insulation on the cable.
When clamping insulated cable onto transformer main tank, it is recommended to use rubber or other non-metallic surface for clamping.
© 2015 Dynamic Ratings Specifications and information is subject to change without notice. 2 of 4

Installing and Performing Maintenance on Dual GIC-4 Sensing Cabinets
Ɩ Application Note
The existing ground cable (up to 500 MCM) will need to be cut. There is an inlet on the leftmost side of the cabinet. Inside the cabinet, adjacent to the inlet labeled “incoming,” there is a lug and an outlet labeled “outgoing.” Each end of the cut ground cable is to be routed in each of the respective holes in the sides of the cabinet, then installed in the provided lugs.
When cutting the insulation, ensure there is metal to metal contact between the bare cable and lug/connector

New OEM transformers are supplied with the appropriate cable and predetermined mounting location for the cabinet.
 Retrofit transformers may have an existing uninsulated cable, which must be replaced with an insulated cable. Retrofit transformers will likely need some fabrication to mount the enclosure. In all cases, the cable must not be grounded at any point prior to entering the cabinet. Installing the Ground Cable
© 2015 Dynamic Ratings Specifications and information is subject to change without notice. 3 of 5

Installing and Performing Maintenance on Dual GIC-4 Sensing Cabinets
Ɩ Application Note
Adjustment to the provided sensors or copper ground bar should not be needed however, verify that the copper bar (figure 3) is running through both sensors, centered, and not touching any surface on either sensor, at any point.
The sensors are prewired to a provided terminal block inside of the cabinet; which will then be wired to the two designated signal terminal points on the Dynamic Ratings monitoring terminal block per the provided DR drawing(s).
When connecting the 24V power to the enclosure, observe the polarity. The +24V (positive) must be connected to the white wire.
© 2015 Dynamic Ratings Specifications and information is subject to change without notice. 4 of 5

Installing and Performing Maintenance on Dual GIC-4 Sensing Cabinets
Ɩ Application Note
Cables used for grounding transformers will be acceptable as jumper ground cables for the
GIC Sensing Cabinet.
Cut back 7.62 cm / 3 in. of insulation on both ends of the ground cable coming into and exiting the GIC cabinet.
Attach the jumper ground cable to the now exposed wire on both ends of the cabinet. Proceed with maintenance work.
After concluding maintenance, reattach both ends of the ground cable to the GIC cabinet.
After the ground cable has been properly reinstalled, remove the jumper ground cable.
Using splicing tape, tape up the exposed ground cable that resulted from cutting back the insulation for the jumper cable installation.
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