+8 votes
by (1.3k points)
Been swapping the light switches out for smart switches 12 have neutrals wired to them 3 don't Why would any sparky wire most of the house one way and just do a couple the other way?  
Been swapping the light switches out for smart switches 12 have neutrals wired to them 3 don't Why w

8 Answers

+5 votes
by (17.1k points)
 
Best answer
More likely the ones without neutral were original circuits. The ones with neutral are new circuits that were added during a remodel.  
+2 votes
by (260 points)
Are some of the ones without not just the other end of a two way?  
+6 votes
by (3.6k points)
Because they would be 2 way lights if they have 3 core cable all labelled with brown they are 2 way
+5 votes
by (1.3k points)
House built 14 years ago, no rewiring been done, all rooms 1 way, only hall, stairs & landings 2/3/4 way
+6 votes
by (1.3k points)
3 rooms without have a single twin & earth, all others have 2 twin & earth (feed & output)
by (5.2k points)
Do those rooms have ceiling fans/light fixtures or are the switches controlling outlets for lamps?  
by (1.3k points)
All light switches are for ceiling lights, no fans ever fitted
+6 votes
by (1.9k points)
30 yr old house here. So many simple circuits rather than proper 3 way switches.  
+6 votes
by (2.5k points)
Try having a house with knob and tub still in it. lol.  
+6 votes
by (2.7k points)
We saw the c by ge new switches coming this quarter. We were able to film them at CES. You can check out the video and watch for the part where they are making them for 3 and 2 wire installs. You’ll even see their knob and tube example.  
https://youtu.be/L5ihsT5lRWQ
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