- Oct 10, 2023
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- If you're a qualified, trainee, or retired electrician - Which country is it that your work will be / is / was aimed at?
- United Kingdom
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- Practising Electrician (Qualified - Domestic or Commercial etc)
I have a single-phase supply running through a 3-pole mccb, Siemens Sirius 3RV2011-0KA10
The mains goes in on 1 out on 2 linked to 4 then out on 3 linked to 5 and out on 6, not conventional but this is the way the company wires them
I have a very high Zs on the outgoing side of the breaker
Terminal 1 0.23ohm
Terminal 2 1.14ohm
Terminal 3 2.26ohm
Terminal 5 3.24ohm
As you can see the Zs at the start is fine but as it goes through the mccb it gets gradually worse, approximately 1 ohm per contact, has anyone seen this before, it is a new installation and I have tested many Sirius mccb's and not seen this before, or is it simply a bad mccb?
The mains goes in on 1 out on 2 linked to 4 then out on 3 linked to 5 and out on 6, not conventional but this is the way the company wires them
I have a very high Zs on the outgoing side of the breaker
Terminal 1 0.23ohm
Terminal 2 1.14ohm
Terminal 3 2.26ohm
Terminal 5 3.24ohm
As you can see the Zs at the start is fine but as it goes through the mccb it gets gradually worse, approximately 1 ohm per contact, has anyone seen this before, it is a new installation and I have tested many Sirius mccb's and not seen this before, or is it simply a bad mccb?
