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crabtree circuit breakers

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mikegray

from United Kingdom

Joined: 17 May 2005
Posts: 26
Location: Bedfordshire,
United Kingdom

PostPosted: Tue Jun 07, 2005 3:58 pm Reply with quote

Hi
i have an old Crabtree Consumer unit fitted with type 1 circuit breakers
i need to fit a 40A or 45A breaker to it.

Can you still get type 1 breakers or equivalent from anywhere
in the 40/45A size or do any other breaker fit this CU

what would happen if i put two 32A in parrallel ??

this is only a temp fik until i have the completet thing replaced and relocated
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mapj1

from United Kingdom

Joined: 24 Nov 2004
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Location: United Kingdom
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PostPosted: Tue Jun 07, 2005 4:06 pm Reply with quote

You should never paralell breakers - unless balancing resitors are used, which they cant be in this case, they are most unlikely to share the load equally, and will end up both tripping in rapid succesion..
Try looking here http://www.thefusecompany.co.uk/
If what you need is not on the site, then calling them can be a good starting point for looking for obscure compatible components. Not the cheapest, but good stocks
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Lectrician

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PostPosted: Tue Jun 07, 2005 4:21 pm Reply with quote

Its like decorating a house with a leaking roof.....

What are you installing that requires that load??

Possibly (seriously) a cheap single way CU (ebay?) henleyed from the tails would be cheaper than sourcing the MCB!

Can you take a photo of the CU and an MCB?? I have a collection of breakers - possibly the one you need icon_wink.gif
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pdcelec

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Joined: 05 Jun 2005
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Location: Birmingham,
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PostPosted: Tue Jun 07, 2005 4:22 pm Reply with quote

Why not fit a 1 or 2 way enclosure next to the existing consumer unit then use any of the new type mcb's
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Lectrician

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PostPosted: Tue Jun 07, 2005 4:25 pm Reply with quote

DP Main sw?? RCD possibly??
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andy

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PostPosted: Tue Jun 07, 2005 5:08 pm Reply with quote

mikegray wrote:


what would happen if i put two 32A in parrallel ??


then you have 64A. which is prob way OTT. aswell as other factors make it more dangerous
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plugwash

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PostPosted: Tue Jun 07, 2005 5:34 pm Reply with quote

one possibility which should be safe enough and reasonablly practical would be to put 2 32A breakers in paralell as you suggest but then to actually protect the cable use a breaker of appropriate rating but a different brand in a seperate box near the CU.
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Jaymack

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PostPosted: Tue Jun 07, 2005 7:45 pm Reply with quote

plugwash wrote:
one possibility which should be safe enough and reasonablly practical would be to put 2 32A breakers in paralell as you suggest but then to actually protect the cable use a breaker of appropriate rating but a different brand in a seperate box near the CU.


Individual breakers must never be installed in parallel for whatever reason, think of the isolation dangers.
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plugwash

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PostPosted: Tue Jun 07, 2005 7:48 pm Reply with quote

its not something i'd do on a permanent basis no but as a temporary measure (with everyone who is working on the system knowing about it) and with appropriate protection downstream i can't see a huge issue.
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Jaymack

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PostPosted: Tue Jun 07, 2005 8:00 pm Reply with quote

plugwash wrote:
its not something i'd do on a permanent basis no but as a temporary measure (with everyone who is working on the system knowing about it) and with appropriate protection downstream i can't see a huge issue.


Still against the regs. "I thought it would be all right m'lord for a short period"
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plugwash

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PostPosted: Tue Jun 07, 2005 8:22 pm Reply with quote

so is leaving live wires sticking out of a switch/socket box covered with just insulation tape but i see sparkys do that all the time.
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g-tec

from United Kingdom

Joined: 07 Jun 2005
Posts: 3
Location: United Kingdom

PostPosted: Tue Jun 07, 2005 8:28 pm Reply with quote

if its the old crabtree C50 range they are large brown mcbs you can still get them from bemco electrical or city electrical factors
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Big_Spark

from United Kingdom

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PostPosted: Tue Jun 07, 2005 8:33 pm Reply with quote

plugwash wrote:
one possibility which should be safe enough and reasonablly practical would be to put 2 32A breakers in paralell as you suggest but then to actually protect the cable use a breaker of appropriate rating but a different brand in a seperate box near the CU.



Plug, I would suggest you think about that statement VERY carefully, actually think about the circuit you are suggesting and whether it would work as desired, and then think about the hazards you are introducing.

It is this type of slap dash, cowboy **** that has resulted in Part P.


Last edited by Big_Spark on Tue Jun 07, 2005 9:33 pm, edited 1 time in total
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mikegray

from United Kingdom

Joined: 17 May 2005
Posts: 26
Location: Bedfordshire,
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PostPosted: Tue Jun 07, 2005 8:33 pm Reply with quote

hi

thanks for the replys

i believe the CU is a SB6000

they are white/grey and say type 1 on them

they have a normal screw connection on the top

the supply is bussed along the bottom by a copper strip
that a screw goes through onto the breaker
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Lectrician

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PostPosted: Tue Jun 07, 2005 8:48 pm Reply with quote

http://www.rbstaronline.co.uk/acatalog/Crabtree_Starbreaker_range__old_type_.html

One of these - looks like they are readily available, and not to pricey.
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