SP&N isolator and double pole isolator

[domapegitashi]

Can anyone describe between SP&N isolator and double pole isolator?

 

[telectrix]

same thing IMO. never heard it described as Sp&N. though. just a D/P isolator, 1 pole for L and 1 pole for N.

 

[domapegitashi]

how about Exel 2 Switch Disconnectors 63A DP & Exel 2 Switched Disconnectors Fused 63A SPSN? Are they same or different??

 

[telectrix]

one's fused and one isn't, according to what you have posted. sounds like the SP&N is the fused one. only the L can be fused.

 

[Darkwood]

A switch disconnector has to:-

Provide an effective clearance between the supply and the load appropriate to the voltage applied.
Provide a means of locking in the 'Off' position. (Padlocking)
Provide a true indication of the contact state.
Provide a safe disconnection from the supply even under fault conditions

A double pole switch dosn't have to meet all these set requirements.....

The two terminologies function the same more or less although when talking switch disconnectors you may also have 'early make - late break' on the neutral especially on 3ph... the uses of the 2 terms relates to requirements of the isolation needed...

 

[domapegitashi]

So for single phase supply, any one of these can be used to isolate the main supply if needed to work. Difference is one with fuse and other without.

 

[telectrix]

all depends if you need a lockable isolator.

 

[domapegitashi]

yes definitely lockable one for safety reason

 

[Engineer54]

A switch disconnector has to:-

Provide an effective clearance between the supply and the load appropriate to the voltage applied.
Provide a means of locking in the 'Off' position. (Padlocking)
Provide a true indication of the contact state.
Provide a safe disconnection from the supply even under fault conditions

A double pole switch dosn't have to meet all these set requirements.....

The two terminologies function the same more or less although when talking switch disconnectors you may also have 'early make - late break' on the neutral especially on 3ph... the uses of the 2 terms relates to requirements of the isolation needed...

Commonly called off load and load breaking, switch disconnectors!!

 

[Knobhead]

DP isolator both contacts break together. SP+N the neutral is early make, late break. Or it has been for the last 40 years I know of.

 

[AndyOz]

DP isolator both contacts break together. SP+N the neutral is early make, late break. Or it has been for the last 40 years I know of.

Absolutely correct! May also find that construction of SP+N allows a neutral link to be fitted.