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Hi folks,
Just need a bit of advice regarding whether or not neutrals require switching.
- 3 phase board, 3 pole main switch, neutral is un-switched. 416.2 (ii) states that switching of the neutral is not required if the conductor is reliably connected to earth by a low resistance to meet the disconnection time requirements of Ch41. How might I conclude that the resistance is low enough, and therefore the reg has been adhered to?
Couple of extra details regarding the above if required:
- 3 phase dishwasher, 4 pole rotary isolator requires replacement. Similar situation to above, I'm trying to work out if I can fit a 3 pole and leave the neutral un-switched.
Many thanks in advance!
Tom.
Just need a bit of advice regarding whether or not neutrals require switching.
- 3 phase board, 3 pole main switch, neutral is un-switched. 416.2 (ii) states that switching of the neutral is not required if the conductor is reliably connected to earth by a low resistance to meet the disconnection time requirements of Ch41. How might I conclude that the resistance is low enough, and therefore the reg has been adhered to?
Couple of extra details regarding the above if required:
- TN-C-S
- Zs @ DB is about 0.08 Ohms
- Continuity measurement between N-Earth about 0.07 Ohms
- BS88-2 63A fuses
- 3 phase dishwasher, 4 pole rotary isolator requires replacement. Similar situation to above, I'm trying to work out if I can fit a 3 pole and leave the neutral un-switched.
Many thanks in advance!
Tom.