Discuss Is this normal way of fitting a main isolation switch? in the Electrical Forum area at ElectriciansForums.net

Welcome to ElectriciansForums.net - The American Electrical Advice Forum
Head straight to the main forums to chat by click here:   American Electrical Advice Forum

P

Panthro83

Had a mains isolation switch fitted (meter>dp switch>temporary cu unit) but I thought being a dp switch both live and neutral should be connected to the switch not just the live? Does anyone know why he'd have installed it this way with the separate neutral box, doesn't it defeat the point of a dp switch?

Is this normal way of fitting a main isolation switch? {filename} | ElectriciansForums.net
 
Hello and welcome also
Main fuse 100A looks like 2.5-4mm singles and dont really know why its connected this way inc cable sizing looks like hes rigged up a bypass cu (cu on a board with socket under for temp power supply to fridge/freezer etc ) as i do in properties that are empty for kettle etc on rewires/cu upgrades.
Just a thought.
 
Last edited by a moderator:
Thanks for the replies... to clarify, the house is being rewired so a temporary socket board (protected by rcd trip switch) is being fed by the single insulated brown/blue wires. The 100A next to the dp switch is actually feeds next door (property is an old house now split in 2). The switch unit in the lower left of picture is old and disconnected, cables on right dropping from above are feeds from old cu (now disconnected). I wasn't there when it was fitted unfortunalty, to my mind it just seems an odd way of installing the switch.

Will get a better picture of the whole arrangement when I'm back at the property tomorrow.
 
Last edited by a moderator:
The 17th Regs states that a main isolator should "break" all live conductors. The switch in your pic is not fitted correctly and needs to be changed.:)
 
The 17th Regs states that a main isolator should "break" all live conductors. The switch in your pic is not fitted correctly and needs to be changed.:)

That doesnt apply to DNO isolators. If you pull the main fuse the neutral is still connected.

The one in the CU must be double pole.
 
Last edited by a moderator:

Reply to Is this normal way of fitting a main isolation switch? in the Electrical Forum area at ElectriciansForums.net

OFFICIAL SPONSORS

Electrical Goods - Electrical Tools - Brand Names Electrician Courses Green Electrical Goods PCB Way Electrical Goods - Electrical Tools - Brand Names Pushfit Wire Connectors Electric Underfloor Heating Electrician Courses
These Official Forum Sponsors May Provide Discounts to Regular Forum Members - If you would like to sponsor us then CLICK HERE and post a thread with who you are, and we'll send you some stats etc

Electrical Forum

Welcome to the Electrical Forum at ElectriciansForums.net. The friendliest electrical forum online. General electrical questions and answers can be found in the electrical forum.
This website was designed, optimised and is hosted by Untold Media. Operating under the name Untold Media since 2001.
Back
Top
AdBlock Detected

We get it, advertisements are annoying!

Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website. For the best site experience please disable your AdBlocker.

I've Disabled AdBlock