Anchoring switchgear equipment – GE Industrial Solutions Entellisys Installation User Manual

Page 39

Entellisys Low Voltage Switchgear

Chapter 4. Equipment Installation

Anchoring Switchgear Equipment

Correct anchoring of the switchgear equipment to the

foundation is very important. After completion of re-

assembly of the equipment at the shipping splits, the

equipment anchoring procedure should be completed.

ANCHORING BY ANCHOR BOLTS – Equipment is

normally secured to its final mounting surface by

anchor bolts threaded into the embedded channel sills.

The bolts were loosely threaded into place before

reassembling the equipment shipping splits and

connecting to the close-coupled transformer, if

appropriate.

The anchor bolts should now be tightened with a torque of

35-40 ft-lbs.

ANCHORING BY WELD - An alternate method of

anchoring the equipment to its foundation is to weld

the equipment to floor sills (or the floor itself if

constructed of steel). Several methods, shown on Fig. 4-

15, are available to the purchaser for welding the

equipment to the channel sills.

a. The front of the equipment

is attached to the

embedded channel sills (1), Fig. 4-15, by two 3/16-

inch fillet welds (2). It is recommended that two

welds, each 2-1/2 inches long (min.), be used for each

section to firmly tie the bottom width post (3) to the

channel sill.

b. The rear of the equipment

may be anchored by one of

three procedures:

•

The first method is by plug welds (4), Fig. 4-15, using the

anchor bolt holes in the rear sill angle (5). The plug weld

should receive a minimum 1/2-inch bead around the

entire circumference of the anchor bolt hole.

•

A second method of securing the rear sill angle (5) to the

channel sill (1) is the use of two linear fillet welds (2) for

each section. It is recommended that each weld be 2-1/2

inches long (min.) with a 3/16-inch fillet (min.).

• A third method for anchoring the rear of the equipment is

to remove the rear sill angle (5) from the switchgear and

weld the rear bottom width post (6) to the channel sill (1).

These welds (2) should, like the front welds, have a 3/16-

inch

(min.) fillet and each have a minimum length of 2-1/2

inches.

CAUTION: If the equipment is to be subjected to

operational or environmental (seismic) shock loading, the

factory must be consulted for anchoring recommendations.

ATTENTION: Si l’équipement doit être assujetti à une

charge de choc opérationnelle ou environnementale

(sismique), il faut consulter le manufacturier afin d’obtenir

des recommandations d’ancrage.