Siemens SDV7, Instruction Manual

11

Preparation for installation

Prior to installation of the type SDV7 
distribution circuit breaker, careful design, 
planning and construction of the foundation 
or base on which the circuit breaker will rest 
must be made. A thorough analysis and 
careful construction may alleviate many 
problems at the time of installation, and 
during operation. It is important that a 
relatively level surface be provided capable 
of supporting the weight of the type SDV7 
distribution circuit breaker, and 0.75 inch 
diameter anchor bolts are recommended. 

Figure 4: Anchoring type SDV7 distribution 
circuit breaker on page 13 illustrates typical 
locations for anchor bolts. No special 
leveling procedures are required.

Prior to installation of a type SDV7 
distribution circuit breaker, study this 
instruction book and the circuit breaker 
drawings, such as general arrangement/
outline drawing, schematic diagram, 
connection diagrams, current transformer 
connection diagram, electrical bill of 
material and nameplate engraving.

Special attention should be given to the 
foundation information contained in this 
instruction manual as well as the 
information provided on the equipment 
drawings. Verify the foundation conforms to 
the requirements described in this 
instruction manual and the general 
arrangement/outline drawing. 

The type SDV7 distribution circuit breaker is 
shipped with the legs attached. The legs 
must be set to the desired height. 

Setting leg height

The type SDV7 distribution circuit breaker is 
shipped with the legs set to a low level (and 
on some units, turned outward). The legs 
must be removed and installed correctly.

Remove the legs from the enclosure. Raise 
the enclosure, and install the legs at the 
desired height. 

Installation

The legs must be installed and turned 
inward, so that the two sides of the each leg 
are adjacent to the enclosure sides and the 
hole at the bottom of the leg is inside the 
perimeter of the enclosure, as in Figure 3: 
Outline drawing on page 12.

Use anti-seize compound (Loctite* 77164 or 
77124 nickel anti-seize) on the 

1

/

2

-13 SAE 

stainless steel cap screws used to secure the 
legs to facilitate removal of the legs should 
it be required in the future.

The height (as installed) between the 
mounting surface (foundation) and the 
bottom of the enclosure must be at least 4” 
(102 mm) and no higher than 28”  
(711 mm).

High-seismic installations

Figure 3: Outline drawing on page 12 shows 
optional cross-braces installed for high-
seismic requirements. 

Cross braces can be installed if the bottom 
of the enclosure is at least 12” (330 mm) 
above the foundation.

The cross braces consist of steel links that 
are adaptable for all installation heights 
(from 13” (330 mm) to 28” (711 mm). 
Install the cross braces as shown in the 
illustration. The end of the link with a single 
hole is bolted to the lowest hole on the leg. 
The opposite link is bolted with the single-
hole end bolted to one of the two highest 
exposed holes in the leg below the 
enclosure. The highest hole or second 
highest hole is used, as necessary to allow 
alignment. Then, bolt the two links together 
towards the middle, using whichever set of 
holes align.

When optional cross braces are furnished, 
install all eight cross braces (four sets) to 
obtain the required seismic performance.

Location

The circuit breaker should be located so that 
it is readily accessible for manual operation 
and inspection. Ample clearance should be 
provided for doors and panels to swing 
open, or to be removed for servicing the 
circuit breaker. 

* Loctite is a registered 

trademark of Henkel 

Corporation.