Floor sockets in concrete :(

[One_of_them]

hey chaps,

today I had to replace a floor socket and knockout box. It seems its been ran in steel conduit and joined to the original KO box using a male bush. Then concrete has been poured all round the box etc.
Obviously this is excellent for me to remove and replace so had a right pig of a job

Im basically looking for advice if any of you encounter these quite often? Without smashing most of the surrounding floor away how is it best to get the new box back in? TBH i've got it in but was unable to get the bush back onto the conduit due to 1) no room and 2) the KO holes were too small.
I have placed a rubber grommet on KO to protect cable entry but just wondering if there may be any problems with not having the bush back on? Are these generally required as part of earthing or is it just to keep things tight and together?

Feeling a bit of a noob here so help if ya can pls

 

[telectrix]

angle grinder round K/O box. ( mind the cable)

 

[One_of_them]

angle grinder round K/O box. ( mind the cable)

excellent thanks. So Im assuming i've gotta chop quite a large amount out then to get a comfortable fit. Any advice of filling in the extra space once fitted? There any form of quick drying easy mix stuff?

 

[telectrix]

thin blade, hole will be smaller than socket face, any probs, use quick dry tetrion filler.

 

[One_of_them]

thin blade, hole will be smaller than socket face

hmm thats where I had problems really, trying to angle the box into the hole while pulling cable through box just didnt wanna work so had to man handle hence box is a bit mangled now. I think the hole may have to be slightly elongated but then its possible the hole will be too big so think the quick dry solution would be good.
Does this seem to be a common problem with floor boxes, sockets and concrete?
How about not fitting that bush back onto conduit, any problems with that??

again cheers

 

[IQ Electrical]

hey chaps,

today I had to replace a floor socket and knockout box. It seems its been ran in steel conduit and joined to the original KO box using a male bush. Then concrete has been poured all round the box etc.
Obviously this is excellent for me to remove and replace so had a right pig of a job

Im basically looking for advice if any of you encounter these quite often? Without smashing most of the surrounding floor away how is it best to get the new box back in? TBH i've got it in but was unable to get the bush back onto the conduit due to 1) no room and 2) the KO holes were too small.
I have placed a rubber grommet on KO to protect cable entry but just wondering if there may be any problems with not having the bush back on? Are these generally required as part of earthing or is it just to keep things tight and together?

Feeling a bit of a noob here so help if ya can pls

The bush does serve a purpose regarding earth continuity but if you have a separate cpc then it shouldn't be a problem.

 

[One_of_them]

The bush does serve a purpose regarding earth continuity but if you have a separate cpc then it shouldn't be a problem.

OK then. Its wired in standard T&E

 

[Deleted member 9648]

The bush does serve a purpose regarding earth continuity but if you have a separate cpc then it shouldn't be a problem.

As long as the conduit is not obtaining it's earth from being bushed to the box........if you dont bush you will need to check continuity to both the CPC AND the steel conduit.

 

[One_of_them]

As long as the conduit is not obtaining it's earth from being bushed to the box........if you dont bush you will need to check continuity to both the CPC AND the steel conduit.

you mean from the CPC of the circuit to the conduit??

 

[sparkydude]

If you dont mind me asking, why were you replacing a knockout box set in concrete??

 

[One_of_them]

If you dont mind me asking, why were you replacing a knockout box set in concrete??

not a prob. Was rotten and the lugs had fallen off preventing me securing the new socket