peterlonz
Newbie level 3
During the course of re-wiring a domestic Chinese 3 speed fan with remote control - the damned thing has stopped working as far as I can tell due to the controller IC having failed.
I began to realise as I planned to convert to manual operation, that I have not ever properly addressed 240VAC sound practice issues:
1) Is it OK to hook up with multi strand cable if the conductor size is adequate, OR is there an insulation spec that would determine essentially "AC rated cable only"?
2) Can I use low voltage insulated connectors; insulated crimp connectors, insulated crimp spade terminals, through connect insulated terminal block strips etc. I use these regularly & see in mains appliances what appear to be identical components; again however should they be specially rated for the task?
3) Whilst I note good practice usually determines that AC switches are DP, so that phase & neutral can be simultaneously switched. Is this a mandated requirement in all countries/states? If not then smaller switches can be used where space is an issue, correct. I am pretty sure the issue of switch rating has been covered before, in any case most switches show several ratings.
4) The fan I disassembled had a 1.6 amp fuse on the PCB. Although the PCB converted AC to DC control voltage using a 275VAC, 1.0uF, X2 rated cap; and I assume current inrush might be a problem - surely for a fan of max power about 60 watts, this fuse (not blown BTW) was over rated.
Is there a generally applied "rule" when deciding fuse ratings, I have generally previously simply allowed about 30% above max rating & used a slow blow.
Comment & help with some or all of the above much appreciated.
Thanks
I began to realise as I planned to convert to manual operation, that I have not ever properly addressed 240VAC sound practice issues:
1) Is it OK to hook up with multi strand cable if the conductor size is adequate, OR is there an insulation spec that would determine essentially "AC rated cable only"?
2) Can I use low voltage insulated connectors; insulated crimp connectors, insulated crimp spade terminals, through connect insulated terminal block strips etc. I use these regularly & see in mains appliances what appear to be identical components; again however should they be specially rated for the task?
3) Whilst I note good practice usually determines that AC switches are DP, so that phase & neutral can be simultaneously switched. Is this a mandated requirement in all countries/states? If not then smaller switches can be used where space is an issue, correct. I am pretty sure the issue of switch rating has been covered before, in any case most switches show several ratings.
4) The fan I disassembled had a 1.6 amp fuse on the PCB. Although the PCB converted AC to DC control voltage using a 275VAC, 1.0uF, X2 rated cap; and I assume current inrush might be a problem - surely for a fan of max power about 60 watts, this fuse (not blown BTW) was over rated.
Is there a generally applied "rule" when deciding fuse ratings, I have generally previously simply allowed about 30% above max rating & used a slow blow.
Comment & help with some or all of the above much appreciated.
Thanks