rich.250
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- Reaction score
- 376
Hi guys.
Called to very strange call out today, cannot get around why and what exactly is going on.
Heres the set up,
TT system with a rod at 51ohms.
100mA s type rcd upfront feeding 2 units. A switch fuse to a submain for the main house db and single 30mA rcd board feeding the rental part.
Basically the fault was discovered while the customer was trying to re heat his tea! Lol
Either microwave will trip the 100mA RCD..... all final circuits are 30mA protected and cant see how this is happening.
RCDs trip at the following when not in series.
100mA S - 70mA, > 2000 @ 1/2 and 356 @ x1
So all ok.
30mA - 26mA, > 2000 @1/2, 56@x1 and 8@x5.
So all ok.
Until they go in series....
Then both trip at 1/2 there rated current. And sometimes when testing the upfront rcd it will tril the 30 after it.
Im so confused, Maybe over thinking it.
Thanks in advance.
Called to very strange call out today, cannot get around why and what exactly is going on.
Heres the set up,
TT system with a rod at 51ohms.
100mA s type rcd upfront feeding 2 units. A switch fuse to a submain for the main house db and single 30mA rcd board feeding the rental part.
Basically the fault was discovered while the customer was trying to re heat his tea! Lol
Either microwave will trip the 100mA RCD..... all final circuits are 30mA protected and cant see how this is happening.
RCDs trip at the following when not in series.
100mA S - 70mA, > 2000 @ 1/2 and 356 @ x1
So all ok.
30mA - 26mA, > 2000 @1/2, 56@x1 and 8@x5.
So all ok.
Until they go in series....
Then both trip at 1/2 there rated current. And sometimes when testing the upfront rcd it will tril the 30 after it.
Im so confused, Maybe over thinking it.
Thanks in advance.