terminating 70mm swa into 3ph board, best way?

vde-electrician · Jan 28, 2019

plan to install a 70mm swa into a 3 phase board.
my idea is to install a schneider acti 9, 3 phase board, with standard incomer etc, and install a schneider extension box below it. incomer or mcbs will only take say 25mm, so planning on using the extension box to reduce the 70mm swa down to say 25mm or 35mm with inline shearbolt connectors with heat shrink over. Thought using these i wouldn't need a hydraulic crimper. Do these conductors need to be fastened back via din rail, or is my method acceptable? whats your thoughts?

buzzlightyear · Jan 28, 2019

I have never heard any thing dafter ,I'm trying to get a python in the box ,but will a grass snake do .

Leesparkykent · Jan 28, 2019

Why don’t you just use an External incomer kit?

KEV 1 N · Jan 28, 2019

buzzlightyear · Jan 28, 2019

delete .

bigspark17 · Jan 28, 2019

What ocpd is protecting the 70mm swa?

buzzlightyear · Jan 28, 2019

bigspark17 said:
What ocpd is protecting the 70mm swa

traveling circus .

buzzlightyear · Jan 28, 2019

what is the 70mm swa feeding .

vde-electrician · Jan 28, 2019

Leesparkykent said:
Why don’t you just use an External incomer kit?

strugglng for space, you mean like one of these... ? Schneider Electric MGE1003X MCCB TPN Enc100A 70kA - https://www.tradesparky.com/circuit-protection/circuit-breakers/mccb/schneider-mge1003x-mccb-tpn-enc100a-70ka

vde-electrician · Jan 28, 2019

buzzlightyear said:
what is the 70mm swa feeding .

a db , what do you think is the best way? struggling for space thats all

vde-electrician · Jan 28, 2019

ocpd will be be 63A tp mcb

vde-electrician · Jan 28, 2019

bigspark17 said:
What ocpd is protecting the 70mm swa?

ocpd will be be 63A tp mcb

Leesparkykent · Jan 28, 2019

vde-electrician said:
strugglng for space, you mean like one of these... ? Schneider Electric MGE1003X MCCB TPN Enc100A 70kA - https://www.tradesparky.com/circuit-protection/circuit-breakers/mccb/schneider-mge1003x-mccb-tpn-enc100a-70ka

No like one of these that bolts to the acti9 board.

SEA9NI2504 | SCHNEIDER Acti9 250A 4P Switch Disconnector | BPX - https://www.bpx.co.uk/store/product/sea9ni2504.aspx

Use it in place of the extension box If you haven’t got room for both the external incomer kit and extension/spreader box. 70mm isn’t that difficult to manipulate in to position.

Andy78 · Jan 28, 2019

vde-electrician said:
ocpd will be be 63A tp mcb

Why was the 70mm opted for out of interest ? How long is the run ?

vde-electrician · Jan 28, 2019

Leesparkykent said:
No like one of these that bolts to the acti9 board.

SEA9NI2504 | SCHNEIDER Acti9 250A 4P Switch Disconnector | BPX - https://www.bpx.co.uk/store/product/sea9ni2504.aspx

Use it in place of the extension box If you haven’t got room for both the external incomer kit and extension/spreader box. 70mm isn’t that difficult to manipulate in to position.

yeah that looks a good method, but the swa will be on an outgoing circuit, and going into a breaker, not the incomer , sorry. large cable due to lengthy run

vde-electrician · Jan 28, 2019

Andy78 said:
Why was the 70mm opted for out of interest ? How long is the run ?

off the top of my head its something like 150m

Leesparkykent · Jan 28, 2019

vde-electrician said:
yeah that looks a good method, but the swa will be on an outgoing circuit, and going into a breaker, not the incomer , sorry. large cable due to lengthy run

In that case it sounds like a horrendous design when taking installation and selectivity into account. I wouldn’t be feeding a distribution circuit that’s over 150 meters away using a mcb as it’s OCPD. I would be looking at either a fused switch, a switch fuse or an MCCB with selectivity being a major factor/consideration in the design.

Leesparkykent · Jan 28, 2019

Eaton Glasgow 63A 415v TPN Fused Switch, 63GNC - https://www.electricals247.co.uk/eaton-glasgow-63a-415v-tpn-fused-switch-63gnc.html?utm_source=&utm_medium=&utm_campaign=&utm_term=&utm_content=&gclid=Cj0KCQiA7briBRD7ARIsABhX8aCePus-9D541Pf4CPzo2xZLWJoDayOfdLkQcy5Nr8cPwNuC_-DaUh8aArx3EALw_wcB

Eaton MEM CSB/CSBA Spreader Boxes - Edwardes - https://www.edwardes.co.uk/en/categories/spreader-boxes

Schneider Electric MGTB1001 Terminal Block 100A - https://www.tradesparky.com/circuit-protection/distribution-equipment/mcb-distribution-board-components/schneider-mgtb1001-terminal-block-100a

Maybe something along the lines of this.

Andy78 · Jan 28, 2019

vde-electrician said:
off the top of my head its something like 150m

Got to be something wrong there then. I reckon 35mm would cut the mustard off the top of my head.

vde-electrician · Jan 28, 2019

Andy78 said:
Why was the 70mm opted for out of interest ? How long is the run ?

off the top of my head its something like 150m

westward10 · Jan 28, 2019

What %vd are you using.

vde-electrician · Jan 28, 2019

westward10 said:
What %vd are you using.

basing it on 5 percent (other uses). gone larger cable, as the outgoing circuits on the far board may have large runs too, so ensuring those cables can be potentially smaller

westward10 · Jan 28, 2019

Thought you were going to say 3% which would have explained the 70.0, seriously bad idea selectivity aside already mentioned to try and terminate that size of cable to an mcb.

bigspark17 · Jan 28, 2019

Could a suitable enclosure under the cu with 200A din connectors then use appropriate tails to main switch.

westward10 · Jan 28, 2019

This is a circuit from the board not the supply cable to it.

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