A common misconception seems to be to miss the "relative to earth" part of 514.10.1 and therefore think that a standard 230V/400V three phase system needs a voltage warning notice.
With regard to 710.559, does this not refer to essential and none essential supplies? As in, one lighting circuit would be supplied via distribution backed up by a generator (the essential circuit), then another separate lighting circuit in the same area, supplied by a none generator backed circuit (non-essential)? I've worked quite extensively in medical locations and haven't come across a light fitting that has BOTH essential and non-essential circuits inside. Not to say they don't exist, I've just never seen one.
@@efixx could be. They still use emergency type fitting, with the 3hr pack. Or do you refer to the centralised battery pack system? Which can push out up to 220V DC?
So glad I don't do domestic/commercial installs and only work on MCC's where we always have 24v, 110v, 230v and 415v all in the same enclosure and all isolated with one fuse switch
Its common practice to install multiple voltages in a single enclosure. They as stated should be seperate and individually isolated. The label on the outside will state the max voltage installed. Internally the idividual circuits will be segregated and marked clearly with their voltage. With reasonable precautions and clear marking, documentation & labelling there is no risk of safety. Industrial panels commonly contain 3phase 400v, single phase 230v, 110v plus 110v, 50v, 24v dc in the same enclosure. An experienced trained electrician should have the skills to identify these seperate circuits. Plus Access should only be permitted by an authorised person. So this in my view is scare mongering and creating problems which do not exist, particullarly with competent designed equipment.
This happens all the time, I work in industrial and voltages are mixed religiously. when we build panels / motor control etc but segregation is key. The same scenario with data cabling and power cables which is more common place in domestic these days.
Question. BS7671 526.5 In a domestic setting why is the MET not in an enclosure? 2 points to consider. DC leakage to earth as a normal operating function and in a FAULT condition will the MET in a sense become a LIVE conductor.
It's pointless having the MET in an enclosure if all your metallic pipework is connected to it via equipotential bonding conductors. Are you planning on having double insulated taps and radiators or putting them in an enclosure too?
Love this video. Could i run a 230v supply to a solar inverter along with the dc cables? Its about 2 meters in length and it would tidy the whole job up? Its all part of the same circuit?
Good question, I'm not entirely sure to he honest. My initial thought is if the insulation is rated at the same voltage it should be ok but there may be PV specific regs I'm not currently aware of. 👍
I have a hard time understanding the way your regulations work… There’s no reaction to running multiple circuits with single leads but when in an enclosure it’s suddenly a risk? If the competence to understand how a simple enclosure with different outlets works it might be a great idea to close it backup and call someone….
What about a control panel? It's an enclosure. Having worked on stand- by generators and CHP units with a mix of 3 ph and low voltage DC supplies within the panel, nobody seems bothered by the mix of supplies.
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A common misconception seems to be to miss the "relative to earth" part of 514.10.1 and therefore think that a standard 230V/400V three phase system needs a voltage warning notice.
Exceptional point, thanks for commenting Peter. 👍
I was thinking that. Some people give it C3 on EICR when 3 phase dist board doesn't have one.
With regard to 710.559, does this not refer to essential and none essential supplies? As in, one lighting circuit would be supplied via distribution backed up by a generator (the essential circuit), then another separate lighting circuit in the same area, supplied by a none generator backed circuit (non-essential)? I've worked quite extensively in medical locations and haven't come across a light fitting that has BOTH essential and non-essential circuits inside. Not to say they don't exist, I've just never seen one.
Great question, is it perhaps a reference to the older "sustained" type emergency light fitting? 🤔
@@efixx could be. They still use emergency type fitting, with the 3hr pack. Or do you refer to the centralised battery pack system? Which can push out up to 220V DC?
So glad I don't do domestic/commercial installs and only work on MCC's where we always have 24v, 110v, 230v and 415v all in the same enclosure and all isolated with one fuse switch
Its common practice to install multiple voltages in a single enclosure. They as stated should be seperate and individually isolated. The label on the outside will state the max voltage installed. Internally the idividual circuits will be segregated and marked clearly with their voltage.
With reasonable precautions and clear marking, documentation & labelling there is no risk of safety. Industrial panels commonly contain 3phase 400v, single phase 230v, 110v plus 110v, 50v, 24v dc in the same enclosure. An experienced trained electrician should have the skills to identify these seperate circuits. Plus Access should only be permitted by an authorised person. So this in my view is scare mongering and creating problems which do not exist, particullarly with competent designed equipment.
This happens all the time, I work in industrial and voltages are mixed religiously. when we build panels / motor control etc but segregation is key. The same scenario with data cabling and power cables which is more common place in domestic these days.
Question. BS7671 526.5 In a domestic setting why is the MET not in an enclosure? 2 points to consider. DC leakage to earth as a normal operating function and in a FAULT condition will the MET in a sense become a LIVE conductor.
It's pointless having the MET in an enclosure if all your metallic pipework is connected to it via equipotential bonding conductors. Are you planning on having double insulated taps and radiators or putting them in an enclosure too?
Love this video. Could i run a 230v supply to a solar inverter along with the dc cables? Its about 2 meters in length and it would tidy the whole job up? Its all part of the same circuit?
Good question, I'm not entirely sure to he honest. My initial thought is if the insulation is rated at the same voltage it should be ok but there may be PV specific regs I'm not currently aware of. 👍
I have a hard time understanding the way your regulations work… There’s no reaction to running multiple circuits with single leads but when in an enclosure it’s suddenly a risk?
If the competence to understand how a simple enclosure with different outlets works it might be a great idea to close it backup and call someone….
Just an extra safety precaution I guess. 😃
No video only audio
Must be your device.
Seems to be working for us bud. 🤔
working for me too. your device must have updates due
Very low audio.
Great video joe ,, subscribe @mainly electrical 👍⚡️
What about a control panel? It's an enclosure. Having worked on
stand- by generators and CHP units with a mix of 3 ph and low voltage DC supplies within the panel, nobody seems bothered by the mix of supplies.