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30 replies to this topic
#26
Crossy
Bull Powered Member Posted 2012-02-21 20:19:39
Thanks for the info on the volt meter, I didn't even consider the low current draw across the multimeter - the RCBO's are seperate units on each of the power circuits. Would a 15 watt test lamp work ok to test L to E to ensure the RCBO's function. That is one of the DIY tests, yes. Not perfect, but better than nothing. #27
Artisi
Super Member Posted 2012-02-21 20:23:13
Thanks for the info on the volt meter, I didn't even consider the low current draw across the multimeter - the RCBO's are seperate units on each of the power circuits. Would a 15 watt test lamp work ok to test L to E to ensure the RCBO's function. That is one of the DIY tests, yes. Not perfect, but better than nothing. Ok, thanks for the info. I'll sleep a bit easier knowing that they (RCBO's) function and not just there for decoration. #28
electau
Senior Member Posted 2012-02-22 06:09:13
Yes, a 15W 220/240V test lamp connected between L and E at a socket outlet will trip a 30mA RCD.
Edited by electau, 2012-02-22 06:09:43. #29
electau
Senior Member Posted 2012-02-22 06:53:16
The main neutral is earthed to an electrode at the main switch board (MSB). If there is more than one distribution board (DB) in an electrical installation such as in a multi tenanted building (eg a condo) a separate earthing conductor must be run from the main switchboard earth bar to each distribution board. The DBs earthing must not be bonded to the neutral.
In practice in Thailand the earth conductors at the distribution board MAY be found bonded to the sub main neutral. It is possible that this MAY be permitted in Thailand if the distribution though the building are reticulated or rising sub-main(s) from the main switchboard. In other words the submain neutral becomes a PEN conductor, the same as the main neutral. Nothing in the PEA document on that subject. If you live in a condo you should have a L. N. and E into the distribution board (ie consumer unit). Note. the SAFE-T-CUT adjustable sensitivity RCBOs have a 5mA setting. This 5mA is mentioned in the NEC for their GFCIs (RCDs). #30
bankruatsteve
Senior Member Posted 2012-02-22 14:54:46
The main neutral is earthed to an electrode at the main switch board (MSB). If there is more than one distribution board (DB) in an electrical installation such as in a multi tenanted building (eg a condo) a separate earthing conductor must be run from the main switchboard earth bar to each distribution board. The DBs earthing must not be bonded to the neutral. In practice in Thailand the earth conductors at the distribution board MAY be found bonded to the sub main neutral. It is possible that this MAY be permitted in Thailand if the distribution though the building are reticulated or rising sub-main(s) from the main switchboard. In other words the submain neutral becomes a PEN conductor, the same as the main neutral. Nothing in the PEA document on that subject. If you live in a condo you should have a L. N. and E into the distribution board (ie consumer unit). Note. the SAFE-T-CUT adjustable sensitivity RCBOs have a 5mA setting. This 5mA is mentioned in the NEC for their GFCIs (RCDs). It might be noteworthy to mention that GFCI's are usually at the receptacle (is the receptacle). ie: RCD circuit protection is not common in the states. And, no issues here, but it's not clear to me where you are going with this thread? Like, are you doing research for a defacto Thai code, or?? Just curious. #31
electau
Senior Member Posted 2012-02-27 07:02:52
Yes, one is trying to find a standard that Thailand uses. There appears that there is none and they use mainly the US NEC for direction. They also use the electrical manufacturers recomendations on installation requirements, eg earthing.
On should be able to ask any person in the electrical industry in Thailand and be able to obtain the answer you want. Edited by electau, 2012-02-27 07:03:22. |
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