- Reaction score
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Just been read through this and it says:
How to determine if it’s an extraneous-conductive-part
For this, a simple measurement is undertaken. This is done by testing the resistance between the suspected extraneous-conductive-part and the MET or the nearest known connection to Earth, such as the circuit protective conductor (CPC) of a local circuit (so long as its connection to Earth has been verified).
Published guidance by the IET suggests that if the ohmic value between the suspected extraneous part and Earth is greater than 22 kΩ, then the part in question is considered as unable to introduce a shock risk and, as such, won’t require bonding.
To measure this sort of reading will require the use of the insulation resistance testing range (MΩ) where 22 kΩ will usually be displayed as 0.02 MΩ.
If the test reading indicates anything greater than 0.03 MΩ, then it may be concluded that the item in question isn’t likely to introduce a dangerous potential and therefore wouldn’t require bonding.
So does this mean that using a MFT set to insulation resistance, I can connect one lead to some cable basket and the other to a nearby socket using a plug (R2) adapter instead of the MET?
How to determine if it’s an extraneous-conductive-part
For this, a simple measurement is undertaken. This is done by testing the resistance between the suspected extraneous-conductive-part and the MET or the nearest known connection to Earth, such as the circuit protective conductor (CPC) of a local circuit (so long as its connection to Earth has been verified).
Published guidance by the IET suggests that if the ohmic value between the suspected extraneous part and Earth is greater than 22 kΩ, then the part in question is considered as unable to introduce a shock risk and, as such, won’t require bonding.
To measure this sort of reading will require the use of the insulation resistance testing range (MΩ) where 22 kΩ will usually be displayed as 0.02 MΩ.
If the test reading indicates anything greater than 0.03 MΩ, then it may be concluded that the item in question isn’t likely to introduce a dangerous potential and therefore wouldn’t require bonding.
So does this mean that using a MFT set to insulation resistance, I can connect one lead to some cable basket and the other to a nearby socket using a plug (R2) adapter instead of the MET?