Nail down a floorboard -bang, lights out

[NorthantsPete]

So I thought id nail down a floorboard that was squeeking as one final job of the day. BANG the lights go out - ive hit a mains cable.

As the hole is in the center of the joist i have a thread going to work out how to repair, the cable was tight, no slack for a junction box either side.

Got a 300v wago holding it in place atm over the top of the joist but need a long term fix and going to be inaccessible

 

[PrenticeBoyofDerry]

Oh dear, nailing down the centre of a floorboard is not something that would be recommended.
The cables should really be capped off or holed at a depth of at least 50mm from floorboard/ceiling board.

So the repair would require a length of twin and earth cable (ideally rated at the same as the existing cable, likely 1.0mm2 or 1.5mm2), so you can join either side of the joist (if you have no slack, to bring the joint past the joist.

The you need a couple of maintenance free (MF) junction boxes. j804s or j803s can be used.
You will also need some earth sleeving for bare earth core/CPC.

Cut the existing cable back at both sides of joist, feed the extra length of twin/earth through joist and join the cables together via MF junction boxes.
The cables insulation needs making off to expose about 12mm of conductor for the MF terminals to grab. It would be wise to test for continuity once the repair is made.

https://www.google.co.uk/webhp?sour...install+a+hager+maintenance+free+junction+box

There is a guide PDF file on the MF junction boxes

 

[Chud]

Wagoboxes can be set up as MF JB's too IIRC.

http://www.screwfix.com/p/wagobox-junction-box/7355f

 

[PrenticeBoyofDerry]

Wagoboxes can be set up as MF JB's too IIRC.

http://www.screwfix.com/p/wagobox-junction-box/7355f

Could you instruct the OP, which Wagos are classified as MF, because not all are!!!!!!!!

The link states they meet BS7671:2008??? That could mean anything but not everything within that standard. It does not state that they meet the requirements of BS EN 60670-22 or BS5733.

 

[Chud]

Iirc it's in the instructions that are supplied with that wagobox.

This is from memory (used once previously) but it specifies what connectors must be used, cable grip spacing and needs to be locked by a cable tie in a specific location. It's pretty clearly worded.

 

[Seafarer1966]

Could you instruct the OP, which Wagos are classified as MF, because not all are!!!!!!!!

The link states they meet BS7671:2008??? That could mean anything but not everything within that standard. It does not state that they meet the requirements of BS EN 60670-22 or BS5733.

What abeyt yee wee looorrd? Chill out mate. The use of exclamation marks is considered aggressive. Eight exclamation marks at the end of your sentence is downright unnecessary.

 

[PrenticeBoyofDerry]

What abeyt yee wee looorrd? Chill out mate. The use of exclamation marks is considered aggressive. Eight exclamation marks at the end of your sentence is downright unnecessary.

Not aggressive or unnecessary, purely making a point, due to information given was lacking quality.
The WAGO boxes are not classified as MF or marked as so, nor do WAGO claim they are(!)
The enclosures come under a different standard.
And I believe only two types of the connectors have reached the standard required by BS5377.
So before someone starts locating joints in inaccessible places, with non-compliant products, I thought best I make that point.
If you have no constructive information to offer the topic, I suggest in a non aggressive manner or grammar, you but-out!

 

[Chud]

The WAGO boxes are not classified as MF or marked as so, nor do WAGO claim they are(!)

From the instruction leaflet https://www.connexbox.com/assets/index/download/id/44/:

In situations where you need to install a Wagobox in an inaccessible location the following instructions must be followed. This ensures the completed accessory complies with the requirements of BS 5733 for a maintenance free accessory. Only WAGO 773 and 222 Series terminals are permitted for use with a Wagobox in maintenance free locations.

Apply BS 5733 Rating Requirements. Please note the terminal ratings in the table below (see link) are different to those published by WAGO. These terminal ratings must be used when selecting the appropriate terminals to assemble a BS 5733 maintenance free accessory.

The Max Aggregate Current (Iag) is the sum of all the possible currents through the Wagobox in normal use. This limit must not be exceeded. Usually the max Iag equals the number of phase terminals in the Wagobox multiplied by the rating of the OPD* for the circuit. There are some exceptions to this rule, so if you are in anyway unsure how to calculate the maximum aggregate current please consult a qualified electrician. For further information on calculating the Max Iag of a Wagobox configuration please visit: http://www.wagobox.com/support and look in the FAQ section for additional support documents. Follow Wagobox BS EN 60670-22 installation instructions ensuring all phase terminals are fitted into the receptacles in the Wagobox. Secure the Wagobox lid using the tie-wrap locking point. Ensure the completed Wagobox is not covered by insulating material.

My suggestion was marked as IIRC, so not handed down as fact. It was based on the OP already having some familiarity with Wago connectors - (and that they can use google/read instructions) as such they may already have the required connectors for MF (773 and 222 series) and may just need to buy a couple of the appropriate boxes for about £3 rather than spend £20+ on a couple of the hager MF boxes (good as they are).

Considering the board is currently up and the cable is jointed over the top of the joist even a temporary repair using a pair of old fashioned JB's would probably be an improvement at this point so the board can at least be laid down for the time being?

 

[PrenticeBoyofDerry]

A fine and informative reply/post.

 

[Seafarer1966]

Like I said me bowler hat and orange sash wearing chum......aggressive.

The Boy from Derry stands in front of the wardrobe mirror daubed in camo paint with his headband on, teeth clenched and holding a badminton racquet (pretending it's an M60)...."don't push me"....

I'd could pick you off a shelf......I could so I could.

I'm not even a catholic but I'll be one just for you love.

 

[PrenticeBoyofDerry]

Untitled

• PrenticeBoyofDerry
• 31 Mar 2015
• 1

Untitled

• PrenticeBoyofDerry
• 30 Mar 2015
• 1

 

[Seafarer1966]

So sure l'm an Ulster Orangeman, from Erin's isle I came,
To see my British brethren all of honour and of fame,
And to tell them of my forefathers who fought in days of yore,
That I might have the right to wear, the sash my father wore!

Chorus:
It is old but it is beautiful, and its colours they are fine
It was worn at Derry, Aughrim, Enniskillen and the Boyne.
My father wore it as a youth in bygone days of yore,
And on the Twelfth I love to wear the sash my father wore.

Chorus

For those brave men who crossed the Boyne have not fought or died in vain
Our Unity, Religion, Laws, and Freedom to maintain,
If the call should come we'll follow the drum, and cross that river once more
That tomorrow's Ulsterman may wear the sash my father wore!

Chorus

And when some day, across the sea to Antrim's shore you come,
We'll welcome you in royal style, to the sound of flute and drum
And Ulster's hills shall echo still, from Rathlin to Dromore
As we sing again the loyal strain of the sash my father wore!

 

[PrenticeBoyofDerry]