BS 60947-2 max permitted ZS, any ideas???

[wizards-sleeve]

Hi
Doing a PIR and am trying to find max values for BS 60947-2 MCCB's
Does anyone out there know this?
Any help would be appreciated
thanks

 

[flyingsparks]

Isnt 60947 a DP isolator switch?? Sure its not a 60898 MCB?

 

[GaryMo]

BS60947-2 is a MCCB, you're getting confused with BS60947-3 which is a switch disconnector/isolator.

 

[Adam_151]

Doesn't BSEN60947-3 define a switch disconnector, while BSEN60947-2 (as in the OP) defines a MCCB?

 

[wizards-sleeve]

I was under the impression a 60947-3 is an isolator and a 60947-2 is an overcurrent protective device

 

[Spark123]

Yeah, 60947-2 is for an MCCB.
These do not have characteristics like MCBs hence you need to consult the manufacturers data for the information. What make and model are they?

 

[GaryMo]

I was under the impression a 60947-3 is an isolator and a 60947-2 is an overcurrent protective device

It is, you must have missed posts by Adam and myself

Can't help you with max loop impedance values though. Maybe contact the manufacturer?

 

[wizards-sleeve]

I have a printout from AMTECH and it states a 60947-3 is an isolator and 60947-2 is listed in the general protective device category. But i cannot find anything anywhere else

 

[wizards-sleeve]

merlin gerin

 

[Spark123]

Have a look on the schneider site (owner of Merlin Gerin): http://www.schneider-electric.co.uk/ . They have some literature on there for MCCBs, however you will need to register in order to view them.
http://www.schneider-electric.co.uk/internet/pws/literature.nsf/luAllByID/NKIY-5JUHR5?open

 

[RF Lighting]

BSEN 60947-2 MCCB:

It appears that this particular MCCB has an instant trip current of 800A (Im)

Using the formula: (Uoc/Im)x0.8 = Max measured Zs

this MCCB has a max Zs of 0.24ohms

I have added the 0.8 multiplier to the formula as correction for thermal differences.

 

[ricicle]

Email me and I will send you the Zs table for Square D MCCBs

 

[GaryMo]

merlin gerin

http://www.schneider-electric.co.uk...it_breaker_application_guide_full_MGD5032.pdf

 

[RF Lighting]

I was close

 

[securespark]

Surely MCCB's are only for industrial use because of their characteristics, not dom/com?