Two way switch

[linux44]

Hi all,

I have an electrician helping me with some re wiring.

for two way switch I am proposing we do it as

1.5mm three core to ceiling
1.5mm three corr from ceiling to first switch
1mm 4 core to the second switch so that we have 1x ground , 2 for l1 and l2 and one for comm

His view was 1mm is too thing but again I am expecting a 100 watt lamp to run from it
cable is rated at 12 amp so even a 1k watt won't be more than 5amp.

what is your view on this?


His view is we shouldn't cable it that way and do it as follow
1.5 from ceiling loop to comm on first switch then a twin an earth between switches and then from second switch take the com and put it back in on the other switch on the light so the switchd live all using 1.5mm


I trust him but think first way is less cabling and achives the same.

Please share your view

 

[Octopus]

Selection of cable size depends on the load, the installation methods and the mcb value.
Not sure you are describing a 2 way switch, sounds more like a 2 gang switch.

Who is responsible for the design and sign off?

 

[ImpededLoop]

There's numerous ways to wire two way switches. As long as your friend is fully qualified, I can't see any reason to question his expertise.

Sent from my HTC One M8s using Tapatalk

 

[davesparks]

It's not best practice to mix cable sizes in a circuit,
Using 1.5mm for a 6A circuit is just wasteful in my opinion when 1.0mm is normally more than adequate.
We don't have a four core cable for normal domestic installation work and we don't have a ground wire.

Other than that I smell a rat!

 

[linux44]

4 core used for interlinked alarm but then I thought i can get a 4 core 1.5mm

Electriciation is qualified but can't sign off. He is helping me to do it all and then at the end get someone independent to test and certify


Re how I am proposing to do the two way swith see below. It is 1 gang with a wiring for two keys to switch it on and off

 

[andyb]

Electriciation is qualified but can't sign off.

By sign off do you mean certify? or notify?

He is helping me to do it all and then at the end get someone independent to test and certify

Why not just get a qualified electrician in from the start?

 

[Pete999]

Hi all,

I have an electrician helping me with some re wiring.

for two way switch I am proposing we do it as

1.5mm three core to ceiling
1.5mm three corr from ceiling to first switch
1mm 4 core to the second switch so that we have 1x ground , 2 for l1 and l2 and one for comm

His view was 1mm is too thing but again I am expecting a 100 watt lamp to run from it
cable is rated at 12 amp so even a 1k watt won't be more than 5amp.

what is your view on this?


His view is we shouldn't cable it that way and do it as follow
1.5 from ceiling loop to comm on first switch then a twin an earth between switches and then from second switch take the com and put it back in on the other switch on the light so the switchd live all using 1.5mm


I trust him but think first way is less cabling and achives the same.

Please share your view

1.5 twin with cpc from light to one of the 2 way switches, 3 core with cpc from one switch to the other job done Bob;s yer Uncle

 

[Phil Thompson]

Hi all,

I have an electrician helping me with some re wiring.

for two way switch I am proposing we do it as

1.5mm three core to ceiling
1.5mm three corr from ceiling to first switch
1mm 4 core to the second switch so that we have 1x ground , 2 for l1 and l2 and one for comm

His view was 1mm is too thing but again I am expecting a 100 watt lamp to run from it
cable is rated at 12 amp so even a 1k watt won't be more than 5amp.

what is your view on this?


His view is we shouldn't cable it that way and do it as follow
1.5 from ceiling loop to comm on first switch then a twin an earth between switches and then from second switch take the com and put it back in on the other switch on the light so the switchd live all using 1.5mm


I trust him but think first way is less cabling and achives the same.

Please share your view

The way the electrician says is how I'd do it.

1.5mm2 single brown and cpc from light to Sw1, 1.5mm2 Single brown and no cpc from light to Sw2 and 1.5mm2 twin brown and cpc between Sw1 and Sw2.

 

[Midwest]

Agree with davesparks, I think this is the Royal We. Come clean OP, before it turns nasty.

 

[Pete999]

The way the electrician says is how I'd do it.

1.5mm2 single brown and cpc from light to Sw1, 1.5mm2 Single brown and no cpc from light to Sw2 and 1.5mm2 twin brown and cpc between Sw1 and Sw2.

Might find it a bit difficult to find sheathed single core and earth

 

[Octopus]

4 core used for interlinked alarm but then I thought i can get a 4 core 1.5mm

Electriciation is qualified but can't sign off. He is helping me to do it all and then at the end get someone independent to test and certify


Re how I am proposing to do the two way swith see below. It is 1 gang with a wiring for two keys to switch it on and off

Nobody in their right mind, least all a DIYer, would employ 1 spark to assist, and another to test and certify.

Sniff, sniff

 

[Pete999]

Nobody in their right mind, least all a DIYer, would employ 1 spark to assist, and another to test and certify.

Sniff, sniff

Right on Sherlock

 

[linux44]

What is cost of certification?

£300?

 

[hightower]

What is cost of certification?

£300?

Certification should be included in the price of having the install done, and is a requirement of all electrical installs. Notification on the other hand, well, it might be £300 if you use your local building control, it will be a whole lot less if you use a registered spark from the off - most wouldn't charge for notification, or at the most a nominal fee to cover their associated fees.

 

[linux44]

Sorry to be novice, what is notification?

my understanding was my mate does all wiring and then some one will check and signs it off(certify)

is notification to council?