Page 209 - Elpress英文样本电气连接压接系统

Structure and operation of the system

Elpress systems consist of the Practical advice:
following 5 parts: 1. Plan the earth connection.
• hardened steel tip What are the soil conditions?
• leading rod Normal and loose soil - steel pipe Ø 17
• extension rod mm is sufficient.
• driving sleeve/impact sleeve Hard and rocky soil- steel rod Ø 21 mm
• earth line (not supplied by Elpress) (type HD) should be used. Is a parallel
earth connection possible?
2. Determine the soil resistivity. Based on
that and the maximum earthing resistan-
This feature is simple ce it can be estimated how much line is

• the earth line is inserted into the needed.
hardened steel tip and clamped by the 3. Start the driving by locking the line
leading rod. into the hardened tip with the leading
• the extension rods are fitted with a rod. 16 mm² line should be folded double
guide pin, which during work is pushed before the tip is attached. In loose soil, a
into the preceding rod. sledgehammer and impact stud is suffi-
• earthing resistance can be measured cient. In heavier soil/at greater depth, a
continuously. When the appropriate power hammer should be used. NOTE: Do
value is reached, driving is interrup- not rotate the driving sleeve during the
ted and the last extension tube is work. 2. Measurement of ground resistance.
withdrawn (and can therefore be 4. Make sure that the line maintains the
reused). same speed down into the soil as the
rod. If it does not, there are the following
possibilities:
- more rods than line required; the rod

may have been bent and then runs
parallel to the surface of the soil and the
line does not follow the pipe through the
ground.
- the rod continues and the line stops; the
line has come loose and can be pulled up
or the tip has folded.
- both stop; stone or rock has been found. 3. The earth line is locked to the hardened
If the stone does not shatter after about steel tip with the leading rod.
10 seconds, you must start over.

In the event of interrupted driving, start
again at a distance at least 1.5 times the
line length already driven down.

5. Preferably measure the earthing resi-
stance continuously while driving down
the earth line. Arrange a parallel earth
connection if necessary. Splicing and bran-
ching of the earth line is contact crimped
by means of Elpress through connectors or 11
branching sleeves and tools.

Driving starts.

1. Resistivity in different soil conditions.

11:3