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Correct fitting of laminated connections

Laminated connections are a means of isolating low voltage equipment from the vibrations inherent in transformers.

This article shows how to correctly mount Charnvel equipment onto a transformer.

Laminated connections drawing

Laminated connections are a means of isolating low voltage equipment from the vibrations inherent in transformers.

Ensure any raw copper surfaces which are to be part of the joint, are cleaned of any oxide layer and coated with a petroleum jelly.
This ensures good conductivity and contact face.

Supporting the weight of the cabinet, align the cabinet so that the mounting studs are central in the mounting holes - Leave the two extreme fittings off to observe alignment - Do not 'hang' the cabinet from the mounting studs.

Loosely assemble as shown in the diagram.
Correct assembly is with the clamp plates to the outside of the laminated connections;

Do not fit clamp plates between busbars Warning
and laminated connections. 

These will however seem loose in the holes provided, this is intentional as it provides some degree of movement and slack.

Observe the correct use of spring and flat washers.

With all fittings in place, tighten the flange fixings to the recommended torque, and adjust the stand off studs (if fitted) to prevent the cabinet from 'nodding'.

After assembly is it of paramount importance to ensure at least 25mm, phase to phase clearance (This includes clearance between fixings ).

After aligning all laminated connections, all clamp fittings should be torqued to a minimum of 20Nm and a maximum of 25Nm.

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