Here, you can get answers to the most frequently asked questions.
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You should use bright zinc plated screws and nuts with a strength grade of at least 8.8 or property class 70 (ISO 3506) for stainless steel screws and nuts.
|Screw||FZB, (8.8) Nm||-stainless steel class 70 Nm||stainless steel class 80 Nm|
System Elpress uses marking on the tube for copper connectors. Looking at a KRF or KSF70, the number 17 are engraved on the neck, indicating that one should use crimping dies with number 17, such as B17, 13B17 TB8-17.
When looking for the right tool to crimp a 95 mm² AK/AS aluminium or aluminium side on a AlCu terminal, it says on the sleeve which tools are to be used. On an AS95, it says ALU95-R13-P25, which means that if a V250 is used, matrix P25M and punch P25 should be used together with matrix holder V2521. R13 stands for a round shape being made if one uses a sector-shaped cable and then the following are used: matrix holder V2531, matrix R13MR, punch R13DR and punch holder V2540.
Pre insulated terminals and tools almost solely use colours that indicate the area for the connector.
It is a misunderstanding to speak about how many Amps a terminal lug or through connector can handle; what is interesting is how high the temperature is in the connection/cable. In the dimensioning of a connection, consideration is taken to the ambient temperature and how much cooling capacity there is to the connection. Our terminals are designed so that when they are crimped according to Elpress’ instructions, they can handle as much load as a power cable as per IEC61238.
No, we see this as a negative as it introduces another contact surface, which can lead to higher resistance. One can advantageously use Vaseline on the contact surfaces after cleaning off the contact surface on the aluminium rail.
Yes, this can be done and should normally be done. The connection point should be protected from weather and wind, and the humidity or other pollutants in the air may not be high so as to cause deposits in connections that can form an electrolyte.
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Too many screw joints are done incorrectly.
Expressions like “I tighten it until it feels good and I don’t need a washer” are not good. It has been shown that the use of a torque wrench provides a percentage error of a few per cent while “I tighten it until it feels good” provides a significantly larger percentage error. Our recommendations are to:
Yes, it is right.
Elpress Cu connections of type KRF/KSF are designed to be used with both stranded (IEC 60228 class 2) and flexible cables (IEC 60228 class 5). In crimping with Elpress tools, the difference in physical area will be evened out as the air is pressed out, however. The “gap” that one initially sees is accordingly an optical problem – it may seem strange, but it is right!
Elpress provides a one or two-year warranty, which does not apply to damage arising from normal wear.
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