Discuss What to put in 'Distribution reference' on forms? in the Electrical Forum area at ElectriciansForums.net

happyhippydad

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This is something I've been meaning to ask for sometime.

What do you guys put for 'Distribution reference, or distribution reference number' on the forms? Sometimes there is what looks like a specific number on the CU, but more often than not there is nothing to distinguish a particular CU.
 
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happyhippydad

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PS... If someone could answer fairly quickly please as I'm watching 'The Evil Dead'..... alone.... in a remote, old house. :anguished:
 
S

Silly Sausage

distribution reference number
The tomb of hell that's been assigned to you?
 

Andy78

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I heard they made a remake ? Not that i'd be interested in that. Still weighing up if my kids are old enough yet to watch the original. I have so many horror films to show them.

As for the db thing, call it what you want. Once you put a label on it, it's named. Call it Malcolm, or Sandra.
 
D

Deleted member 26818

This is something I've been meaning to ask for sometime.

What do you guys put for 'Distribution reference, or distribution reference number' on the forms? Sometimes there is what looks like a specific number on the CU, but more often than not there is nothing to distinguish a particular CU.
Are you referring to DB reference?
Either leave it blank if there is only one, or call it #1.
If there is more than one, either give each a # or a description.
 
D

Deleted member 105166

If they aren't already labelled then I would generally begin at DB1 and make my way from there.
Agreed. As an aside (more relevant in commercial) when a board is retired or replaced, unless the circuit arrangement of the replacement is an absolute 'like for like', it is good practice to retire the former DB number, as opposed to reusing that DB number. This is to avoid any confusion in documentation that may exist referring to a former board layout.
 
Lol. For a reason I can’t explain I always call it main when there is only one. Probably thinking main(s) or the main one. Dunno, never really thought about it until now. DB1 works though.
 
D

Deleted member 26818

Was having a chat with a 2391 tutor today.
He was telling me that we can have 2 METs.
 

davesparks

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Was having a chat with a 2391 tutor today.
He was telling me that we can have 2 METs.
As I understand it there can only be one MET for an installation, this is the one that the earthing conductor connects to. Any other earth bar after this is an EMB (earth marshaling bar)
 

Risteard

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As I understand it there can only be one MET for an installation, this is the one that the earthing conductor connects to. Any other earth bar after this is an EMB (earth marshaling bar)
I agree. The word "Main" in Main Earthing Terminal should be evidence enough of this. Others would be, as you indicate, Earth Marshalling Terminals.
 
D

Deleted member 26818

He did explain to me the difference between IP4X and IPXXD, which I always thought were just different ways of saying the same thing, also IP2X and IPXXB
 

Risteard

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He did explain to me the difference between IP4X and IPXXD, which I always thought were just different ways of saying the same thing, also IP2X and IPXXB
If you look at the definitions they are quite different indeed. In fact IPXXB and IPXXD allow surprisingly large gaps.
 
D

Deleted member 26818

If you look at the definitions they are quite different indeed. In fact IPXXB and IPXXD allow surprisingly large gaps.
No greater than IPX2 or IPX4.
In fact IPXXB is 0.5mm smaller than IPX2.
I just didn’t realise the XXB/D related to internal access to live parts.
 

Risteard

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No greater than IPX2 or IPX4.
In fact IPXXB is 0.5mm smaller than IPX2.
I just didn’t realise the XXB/D related to internal access to live parts.
I wouldn't agree that it's no greater. See this for example: IET Forums - Cable Trunking IP4X or IPXXD (BS 7671 Regulation 521.10.1) - -----------------------/forums/forum/messageview.cfm?catid=205&threadid=104323
 
D

Deleted member 26818

(Just realised I got the numbers in the wrong place, IP2X and IP4X.)
This is the info I have:
IP2X = will not allow a sphere with 12.5mm diameter to enter,
IPXXB = will not allow a British Standard jointed Finger to come into contact with live parts. British Standard jointed finger is 12mm diameter and 80mm long.
IP4X will not allow 1mm diameter wire to enter,
IPXXD will allow a 1mm diameter wire to enter, but must not come into contact with live parts to a depth of 100mm.
 

Risteard

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Yes indeed, but a large object could enter so long as it doesn't come into contact with live parts. That is what I was pointing out about large gaps being possible with IPXXB/IPXXD.
 
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