could anyone tell me the means of conductor identification for mims cable eg test method test instrument instrument range and expected reading question from city and guids 2360 assignment thanks for any help
mims conductor identification
- Thread starter evertonian
- Start date
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If the mims (MICC) cable is already installed then you could look at the gland which has the size stamped on the side. The test methods are the same as any other BS 7671 test. Is this what you mean or could you be more specific
evertonian said:
to test for which conductor is which, find the earth at each side and sleeve it. test for insulation resistance before diong anything else, altho you should have already done that.
at 1 side, sleeve all conductors, and short 1 of these to earth. at the other end, find it by continuity between earth and a conductor.
To ident the size, it will be stamped on the pot.
I think you may mean how to identify the cores as in L1 L2 L3 N if not marked, or tape fallen off etc??
For this you would use a low reading ohm meter (thats the description they like on courses!) Short a core to earth (sheath) at one end, and make sure the other 3 are not shorted. Test between earths and the sheath at the other end, which ever has the low ohms is the core that is shorted. Expect a reading of less than ohm on most runs (longer runs, higher reading, but still low).
In the real world, when the two ends are a long trek, up down ladders etc, you can make your self a little aid.....
A box with two resistors in, one about 1Mohm, and one about 100ohm.
4 cable cores from your box with crock clips on, connected as drawing. Then, connect the green to sheath, and the others to the ends of the cable. The core with no crock clip on will read off-range, one will read 1Mohm, one 100ohm and the other 0.2or something close.
I think you may mean how to identify the cores as in L1 L2 L3 N if not marked, or tape fallen off etc??
For this you would use a low reading ohm meter (thats the description they like on courses!) Short a core to earth (sheath) at one end, and make sure the other 3 are not shorted. Test between earths and the sheath at the other end, which ever has the low ohms is the core that is shorted. Expect a reading of less than ohm on most runs (longer runs, higher reading, but still low).
In the real world, when the two ends are a long trek, up down ladders etc, you can make your self a little aid.....
A box with two resistors in, one about 1Mohm, and one about 100ohm.
4 cable cores from your box with crock clips on, connected as drawing. Then, connect the green to sheath, and the others to the ends of the cable. The core with no crock clip on will read off-range, one will read 1Mohm, one 100ohm and the other 0.2or something close.
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Lectrician said:In the real world, when the two ends are a long trek, up down ladders etc, you can make your self a little aid.....
A box with two resistors in, one about 1Mohm, and one about 100ohm.
4 cable cores from your box with crock clips on, connected as drawing. Then, connect the green to sheath, and the others to the ends of the cable. The core with no crock clip on will read off-range, one will read 1Mohm, one 100ohm and the other 0.2or something close.
good idea! will have to do something like that in future
sorry mate would help if i could doing part one,
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