Connections of Current Terminals
Fasteners
The fasteners for the transformer connection are part of the current terminal (housing side). They are made of
a stress-crack and corrosion-free alloy. The head shape of the clamping screw allows the use of a DIN 5.5 x 1.0
screwdriver or a PZ2 screwdriver. Siemens recommends a PZ2 screwdriver.
Connection Elements and Conductor Cross-Sections
The following connection types are possible:
•
Stranded-wire conductor with ring-type lug
•
Stranded-wire conductor with bootlace ferrule
•
Solid conductor
Siemens recommends the use of ring-type lugs with the dimensions shown in the following figure. Use copper
cables only.
[dwringka-030211-01.tif, 1, en_US]
Figure 5-28 Ring-Type Lug
D (for bolt) 5.0 mm (0.2 in)
W 9.5 mm (0.37 in)
L 7.1 mm to 7.7 mm (0.28 in to 0.3 in)
In order to maintain the insulation route, you must use insulated cable lugs or you must insulate the crimping
zone (for example, by using heat-shrink tube insulation)
Siemens recommends ring-type lugs of the PIDG series made by Tyco Electronics.
Use copper conductors only, at least certified for a temperature of +105 °C. Use prepared solid conductors
intended for single or multi-wiring connection, maximum 2 wires per pole, and for usage of ferrules, crimped-
on pressure wire connectors (ring-type and pin-type).
2 terminal lugs can be installed for each connection.
[dwklest1-030211-01.tif, 1, --_--]
Figure 5-29 Example of a Current Terminal with Connection of Cross Connectors and Single Cables
5.7.2
Working on the Device
5.7 Installing Current and Voltage Terminals
216 SIPROTEC 5, Hardware Description, Manual
C53000-G5040-C002-M, Edition 12.2021
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