un-switch or switch spur

[brightspark1]

I would like to know when should you use a un-switch spur or a switch spur for what tasks,
I need to wire a pump so would you an un switch spur or switched spur

 

[sjm]

Pump would be a motor and therefore require a means of isolating for maintainance, so use a switched spur.

 

[Hawk81]

Well it all depends. Unswitched spurs would be used alot for fire alarms and burglar alarms ect. Switched spurs are used in places that they can isolate items that might need switched off on a regular basis. Will this pump be switched on and off alot or should it be left on? that will decide what you use.

 

[Hawk81]

Pump would be a motor and therefore require a means of isolating for maintainance, so use a switched spur.

I disagree. You can pull the fuse for maintainance. Switched spur might be turned off by someone when they shouldnt. Although switched spur can be used but does not have to be.

 

[brightspark1]

the pump is a central heating pump I think ( not seen it yet) It just dawned on me today when you carry out tasks I just wondered when should you use what spur, I have checked the regs but there is no defining answer

 

[Spudnik]

CH pump?

Assuming a bronze pump?

 

[Jimmyb]

I disagree. You can pull the fuse for maintainance. Switched spur might be turned off by someone when they shouldnt. Although switched spur can be used but does not have to be.

pulling the fuse doesnt isolate neutral tho does it ?

 

[Spudnik]

The only time you need DP isolation is for TT systems.

 

[Hawk81]

pulling the fuse doesnt isolate neutral tho does it ?

It does not. But do we need the neutral isolated for maintainance?

 

[acvc]

The only time you need DP isolation is for TT systems.

Can someone explain this to me? Something to do with the earth path then, or the chance of a neutral to earth potential difference???

 

[Sintra]

pulling the fuse doesnt isolate neutral tho does it ?

Nor does pulling a fuse or opening a MCB.

 

[Hawk81]

Nor does pulling a fuse or opening a MCB.

Exactly the point i was trying to make.

 

[robsparky1975]

unswitched would generally be for circuits where you would not want people to switch something off by mistake,say fire alarm etc by brushing past it,or an addition to a ring circuit with an unswitched to supply a radial circuit,again unswitched for the same reason,if you had equiptment in a bathroom outside of zones then again unswitched(although i would site outside bathroom and use flex outlet plate personally),so most of the time switched unless any reason to think that you would not want it switched off by ordinary people.

 

[brightspark1]

Good point I will put a switched spur on it, thanks for your help guys

 

[Hawk81]

unswitched would generally be for circuits where you would not want people to switch something off by mistake,say fire alarm etc by brushing past it,or an addition to a ring circuit with an unswitched to supply a radial circuit,again unswitched for the same reason,if you had equiptment in a bathroom outside of zones then again unswitched(although i would site outside bathroom and use flex outlet plate personally),so most of the time switched unless any reason to think that you would not want it switched off by ordinary people.

exactly what I said in the first reply.