Metal blanks in AMD 3 boards

[MFS Electrical]

I hate metal blanks there I said it I simply do not see the point the cover should stay closed itself and if there were an internal fire the mcbs would melt and the fire would get no further than the metal lid what about earthing are you supposed to drill and bolt an earth onto the blank? Scrape away the paint on the Cu and crush the ends of the blank to ensure good continuity?
I also see no point in a metal board if your going to gland tails into it with a plastic gland or use the huge gaping rear entries without intumescent Sealant round the cables like 99.5% of sparks do.... and even at that the cables themselves are not fireproof !!!!

 

[Dave OCD]

I don't like sockets/switches with pathetic shallow terminals, beetroot,garlic,mayonnaise,seafood,liver,kidney or tongue. Nothing wrong with a nice piece of cod or haddock though Tel.

 

[Baker1988]

I thought the metal boards where not to contain it but to stop the board from melting and causeing more problems like dripping plastic onto the carpet and setting that on fire.

 

[MFS Electrical]

You are overthinking it. It's not supposed to contain a fire, it's just not supposed to actually burn itself. Why on earth would you want to earth a blank FFS?

Cause it’s metal... what if a cable were to somehow get chafed on it and it became live could you personally guarantee that the blank would provide a sufficient path to earth through all the paint of the cover etc to disconnect the circuit? But that wasn’t the point the point was if there is a metal lid why the F*** do you need a metal blank it’s not going to burn any harder or provide anymore fuel than the breakers the grommits the tails glands etc etc etc
I don’t have my BYB to hand as it’s in my office but it seems the way the regs are worded it intends to contain fire until it burns itself out because whilst at the same time preventing devastating spread of the fire
I’m sure there is a part that says something like any any other reasonable (precautions or something)to prevent the spread of fire from the containment or something along those lines...

 

[MFS Electrical]

Deleted - duplicate

 

[MFS Electrical]

You had sun today? East coast has been a bit chilly compared with recent weeks.

Chilly this morning but around 21c this afternoon

 

[westward10]

The sun always shines down in my rainbow valley.

 

[MFS Electrical]

It says as far as I know... the cable installation entry method shall, as far as is reasonably practicable, maintain the fire containment of the enclosure.

 

[sparksburnout]

It says as far as I know... the cable installation entry method shall, as far as is reasonably practicable, maintain the fire containment of the enclosure.

Ain't you got any big bills or hair loss or anything?

 

[MFS Electrical]

Ain't you got any big bills or hair loss or anything?

What?

 

[Midwest]

I thought the metal boards where not to contain it but to stop the board from melting and causeing more problems like dripping plastic onto the carpet and setting that on fire.

It says as far as I know... the cable installation entry method shall, as far as is reasonably practicable, maintain the fire containment of the enclosure.

Depends on who you listen to. I watched one of those Certsure 'web air' vids, soon after 421.1.201 draft was realised, and they stated the intention was to remove the plastic as a source of combustion.

But then if you read the IET's 'wiring matters 55' on the subject, 'The intent of Regulation 421.1.201 is considered to be, as far as is reasonably practicable, to contain any fire within the enclosure or cabinet and to minimise the escape of flames'.

We had fish last night.

 

[Octopus]

If the CU manufacturers actually built quality products, then the considerations of AMD3 boards wouldn't be necessary.

Bring back main incoming switches, mounted on the main frame of the unit with 2 screws for the tails................... they never went up in flames or melted............

 

[Midwest]

Have heard of that before

 

[Andy78]

What kind of fish ?

 

[westward10]

Come on Middy we are on tenterhooks.

 

[Midwest]

What kind of fish ?

It came out of a cardboard box, covered in breadcrumbs (the fish), so who knows