Rated to 63 amp?

[QSGAZ]

I have to put a new sub board in, the problem i have is the installation that i need to get a feed from is 20 years old. My question is, the fork connectors that come from the busbar to the mcb, is it rated to take 63a?

 

[telectrix]

difficult to say. they look a bit small for 63A. could you not fit something a bit more substantial,

 

[Rockingit]

Can you not just fit a new busbar?

 

[QSGAZ]

difficult to say. they look a bit small for 63A. could you not fit something a bit more substantial,

I thought it was a bit small, i dont know where i can get a new connector from. any idea?

Can you not just fit a new busbar?

Cant turn it off due to being a tele comms installation (its DC)

 

[UPS-for-Africa]

They look like 30 amp forks, wont burn but you will get maybe 500 milli-volts drop across the forks at 60 amp

 

[Deleted member 26818]

Perhaps you could obtain some comb busbar.
Cut it to size to fit the MCB, and then drill and bolt it to the existing busbar

 

[Rockingit]

Spin - that's quite an ask if he can't de-energise the original bar!! But agreed that's what I'd look at doing as well.

 

[Knobhead]

The MCB’s are rated at 10 & 16A. The fork connections don’t carry 63A. don’t worry about it.

 

[Rockingit]

The MCB’s are rated at 10 & 16A. The fork connections don’t carry 63A. don’t worry about it.

I think the issue is that he needs to fit/swap in a 63A MCB

 

[sparkiegaz]

The MCB’s are rated at 10 & 16A. The fork connections don’t carry 63A. don’t worry about it.

you dont miss much do you feller,,,,,

 

[telectrix]

The MCB’s are rated at 10 & 16A. The fork connections don’t carry 63A. don’t worry about it.

think OP wants to fit a 63A breaker, so one of those forks would be undersized.

 

[sparkiegaz]

think OP wants to fit a 63A breaker, so one of those forks would be undersized.

double them up one on top of the other,,,

 

[Knobhead]

Without seeing a 63A MCB it’s impossible to say. Common sense would say a larger fork will be fitted.

 

[Engineer54]

I thought it was a bit small, i dont know where i can get a new connector from. any idea?



Cant turn it off due to being a tele comms installation (its DC)

Are you saying that the above MCB board is a DC supplied board??

I hope not, those MCBs as far as my recollection, aren't DC rated by MG!!

 

[Rockingit]

Can of worms, anyone?

 

[Knobhead]

Are you saying that the above MCB board is a DC supplied board??

I hope not, those MCBs as far as my recollection, aren't DC rated by MG!!

MG only rate them to 440V AC so there could be an inherent fault in the whole system.
That being said we don’t know what the DC voltage is.

 

[QSGAZ]

We buy most of our equipment straight from the main dealers so all the breakers we buy are for DC, the board your looking at is custom built (again along time ago). I cant double them up because i dont have enough forks to double them up with. All truth be told all i want to know is, where can i get these forks from and will they be rated to 63Amp. dont worry about the rest of the installation.
Cheers for all your feed back and your help

 

[Engineer54]

We buy most of our equipment straight from the main dealers so all the breakers we buy are for DC, the board your looking at is custom built (again along time ago). I cant double them up because i dont have enough forks to double them up with. All truth be told all i want to know is, where can i get these forks from and will they be rated to 63Amp. dont worry about the rest of the installation.
Cheers for all your feed back and your help

What do you mean, ''never mind the quality feel the width''??

I've worked with MG breakers now for a good number of years, and as far as i remember those MG breaker designation numbers you show, are not certified for DC protection... I may be wrong, but i don't think so!!!

 

[QSGAZ]

Hello Engineer54.
Can you tell me the difference from a dc breaker to an ac breaker? we work directly with schneider electric. dont forget the custom fit board is at least 10 years old.

 

[Engineer54]

All to do with coil winding of the instantaneous tip switch gaps arch gaps, arch suppression etc.... But MG and other manufactures always stipulate very clearly if an MCB is suitable/certified to operate on DC current circuits.

As an observation over the years, they tend to be wider or fatter than AC only MCBs....