Double pole switch

[Scifen]

Hi guys I'm relatively new to the electrical trade just want to know why do we use double pole switches I know they cut off both line and neutral but why do we use them for shower circuit, ovens, jobs, fridges, microwaves, and not use single pole ??

 

[pc1966]

Basically it is an additional safety feature so in the (hopefully) unlikely case of L & N polarity reversed, or an open-neutral fault, the act of switching off to isolate really is doing that when something serious has gone wrong.
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Also if you have a split RCD style of board (or TT with delay RCD incomer) then it helps locate N-E faults and avoids them causing too much grief until fixed, but that is a side-benefit and not the primary reason.

 

[7029 dave]

To isolate fixed appliances from the installation.

 

[Scifen]

Thanks for the information lads

 

[Risteard]

They are used because the neutral conductor is a live conductor.

 

[ipf]

They are used because the neutral conductor is a live conductor.

Out to mix 'em up on a Sunday, eh?

 

[Scifen]

Thanks mo Chara, think I have grasped the 2 pole switch now.