Installation

Shorting switches are provided for connection of 3 phase CTs (current transformers) and

a separate core balance ground fault CT or 3 phase CTs connected for residual ground fault sensing.

When each CT switch is opened, the CT is shorted. It is essential that the CT is connected to the

shorted side of the switch as shown in the following figure,

otherwise dangerously high voltages would be present from the open circuited CTs.

When the switches are open, test plugs can be inserted to either inject signals into the

relay wired to the switches or monitor signals such as CT current from the switchgear.

The 515 Blocking and Test Module consists of a metal chassis attached to the 515 test switches that slides into the panel.

A single cutout in the panel, as per the dimensions shown in Figure 3, is required to mount the 515 test switches.

Slide the metal chassis attached to the 515 test switches into the cutout from the front of the panel.

While firmly applying pressure from the front of the 515 module to ensure the chassis fits snugly,

bend out the retaining tabs as shown in Figure 3. Usually the retaining tabs will be sufficient

to hold the 515 module securely in place. If additional fastening is desired bend out the clamping

screw tabs at both ends of the chassis at right angles.