GE Industrial Solutions Entellisys Low Voltage Switchgear - Manuel (Page 29)

Entellisys Low Voltage Switchgear
29
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.
1. ANCHORING BY ANCHOR BOLTS - Indoor equipment are
normally secured to their 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.
2. 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 front lag sill (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 front and rear sill angles (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.
1. Channel sill 2. 3/16-inch fillet weld
3. Front sill angle 4. Plug weld in anchor bolt hole
5. Rear sill angle 6. Rear width post
Fig. 4-15 Indoor equipment weld anchoring