Two rings in one room

[Delboy247]

Hi whilst inspecting a job I have come across two circuits supplied from two different phases how should I deal with this as its supplied from two different boards.

 

[roukel01]

unless they are within arms reach then nothing need to be done, if they are within arms reach of each other, then a notice needs to be put in place saying something along the lines of "400 volts exisits between the two sockets" (the exact wording is in the regs somewhere!

 

[Sintra]

Have a read at 514.10 page 93

 

[Delboy247]

They are in arms reach and I will put a notice on cheers.

 

[MFHEng]

HI
You don't need to mark them the regulation is refering to fixed equipment and not socket outlets, at what point would you have two socket circuits dismantled at the same time? The sockets have the same nominal nominal voltage to earth of 230 volts. It is ambiguos and has been removed from AMD1. Just to clarify, you do not have to identify, with voltage labels ,sockets or note that they are fed from differing phases and therefore pose a 400 volt threat. You would label them normally stating there circuit and phase dsesignation but thats all.

 

[IQ Electrical]

HI
You don't need to mark them the regulation is refering to fixed equipment and not socket outlets, at what point would you have two socket circuits dismantled at the same time? The sockets have the same nominal nominal voltage to earth of 230 volts. It is ambiguos and has been removed from AMD1. Just to clarify, you do not have to identify, with voltage labels ,sockets or note that they are fed from differing phases and therefore pose a 400 volt threat. You would label them normally stating there circuit and phase dsesignation but thats all.

The reg actually refers to equipment and enclosures, enclosures being a rather all-encompassing term!

Guidance Note 1 has this to say:

Warning notice – Voltage
The warning notices regarding voltage concern three different situations:
1 Inside an item of equipment or enclosure
Where the nominal voltage (U0) within an item of equipment or enclosure exceeds 230 volts (e.g. a non-standard voltage such as 650 V) and where the presence of such a voltage would not normally be expected, before access is gained to a live part, there must be a clearly visible warning of the maximum voltage present.
2 Between simultaneously accessible items of equipment or enclosures
Where simultaneously accessible terminals or other fixed live parts have a nominal voltage (U0) between them which exceeds 230 V (such as where the voltages are from different systems), then a warning notice must be fixed in such a position that anyone, before gaining access to such live parts, is warned of the maximum voltage which exists between those parts.

It would appear that you do not HAVE to apply a warning label but of course you can if you want to!

 

[MFHEng]

As I said, the reg should refer to fixed equipment, as was it's intent and how it was expected to be perceived , however the actual reg was ambiguous, which is why we may be removing it from the regs in AMD1 .GN1 will be updated accordingly.

 

[IQ Electrical]

As I said, the reg should refer to fixed equipment, as was it's intent and how it was expected to be perceived , however the actual reg was ambiguous, which is why we are removing it from the regs in AMD1 .GN1 will be updated accordingly.

Who's we?

Was this in the draft for public comment?

 

[MFHEng]

"We" would be the IET

Yes this is in the draft for public comment. the regulation will also be changed from 514.10.1 to 514.8.1 and is on page 52/53 of the DPC.

 

[IQ Electrical]

"We" would be the IET

Yes this is in the draft for public comment. the regulation will also be changed from 514.10.1 to 514.8.1 and is on page 52/53 of the DPC.

In what capacity are you the IET?

 

[IQ Electrical]

Wow, senior engineer to the IET, which office do work from? I probably know you!

 

[IQ Electrical]

Hang on, your post has vanished!

 

[accordfire]

Hang on, your post has vanished!

So it did. Wonder what caused that....

 

[MFHEng]

Nothing sinister ,just playing with the reply tools. I work out of both

 

[IQ Electrical]

It's good to have a Senior Engineer of the IET here, do you post much on the IET forums?