- Joined
- 6 Jan 2005
- Messages
- 59
- Reaction score
- 2
- Country
OK, there I was with an electrician all lined up to put a new CU in (many thanks for the advice and comments BTW) when he disappears... Turns out he's gone to Spain to look after his (very elderly) parents who've been taken ill. And I can't get another electrician (that I trust anyway). I haven't given up completely, but am contemplating doing this myself.
So I've now got a (use but still in calibration) Seaward DL-750, but it only comes with a standard 13A plug: which is not obviously suitable for measuring Ze. I've tracked down a supplier of the appropriate leads but they don't have any at the moment. I could wait (it's not that urgent) but two things occur to me.
1. The existing 13A lead is just a conventional IEC-type power lead with the fuse removed. I've got lots of these and could adapt one easily by removing the 13A plug and adding clips/probes as appropriate. Seems a bit dodgy I admit.
2. I could add a temporary radial and measure Zs, then measure R1+R2 and calculate Ze. This would avoid the need to poke probes at the incoming phase terminal, which isn't something I'm that bananas about doing so given a choice, I like this idea more. (I know I don't have to add the temp. radial to do this, but it does seem a safer - not having lots of connected sockets with the main bonding off.)
For info, the REC has explicitly told me that pulling the fuse to replace the CU is OK - and they deliberately did not seal it for that reason.
Neal
So I've now got a (use but still in calibration) Seaward DL-750, but it only comes with a standard 13A plug: which is not obviously suitable for measuring Ze. I've tracked down a supplier of the appropriate leads but they don't have any at the moment. I could wait (it's not that urgent) but two things occur to me.
1. The existing 13A lead is just a conventional IEC-type power lead with the fuse removed. I've got lots of these and could adapt one easily by removing the 13A plug and adding clips/probes as appropriate. Seems a bit dodgy I admit.
2. I could add a temporary radial and measure Zs, then measure R1+R2 and calculate Ze. This would avoid the need to poke probes at the incoming phase terminal, which isn't something I'm that bananas about doing so given a choice, I like this idea more. (I know I don't have to add the temp. radial to do this, but it does seem a safer - not having lots of connected sockets with the main bonding off.)
For info, the REC has explicitly told me that pulling the fuse to replace the CU is OK - and they deliberately did not seal it for that reason.
Neal
