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GENERAL INSTRUCTIONS FOR PF
MODULAR ENCLOSURES FOR
TRANSFORMER SUBSTATIONS
IG-021-GB
version 07
29.08.2008
B) Soft Grounds
: These are sandy areas, landfills, etc., with a strength of less than
0.9 – 1 kg/cm
2
.
In these cases, foundations suitable for the ground conditions must be prepared, and this
may imply the construction of a reinforced concrete bed to distribute the load over a wider
surface
[5]
.
Thereafter, it should be levelled using sand, as in the previous case.
3.4. LEVELLING PROCESS
This is a fundamental operation which has a decisive influence in both the assembly and the
stability of the PF Modular Transformer Substation.
3.4.1. Levelling Tools
1 Spirit Level
1
Pickaxe
1 Round-end spade
1 Square-end spade
1 Wooden or Plastic lump hammer
1 Levelling board set (
reference 3947251-10
)
A) Normal Conditions
The levelling boards are placed according to the measurements on the drawing below
(the level of 3100 mm is a minimum value).
Once the levelling rods have been positioned, the levelling boards should be used to check
that the ground is in perfect condition.
[5]
Consult Ormazabal’s Technical-Commercial Department.
Figure 3.1:
Levelling Specifications
3100
550
80
20
150
0 Level
Levelling board
A B
Dimensions in millimeters
