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Merlin Gerin Square D Telemecanique
The International & North American standards
MOE - Presentation 8th Oct
MOE - Presentation 8th Oct
The international & american standards Content
presentation of the standards
the test sequences
MOE - Presentation 8th Oct
The international & american standards Content
presentation of the standards• the standard influences• the North American standards• the international standard• standard comparison
generalities on the tests
MOE - Presentation 8th Oct
The international & american standards The standard influences
IEC
IECIECIEC
IEC JIS
CSA
UL
UL
IEC IEC
MOE - Presentation 8th Oct
The international & american standards The North-American standards
general rules
codes NEC (National Electrical Code)publisher : NFPA (National Fire Protection Association)
guides recommandations CEE
"product" standards
ANSI UL NEMA
MOE - Presentation 8th Oct
The international & american standards The international standard
general rules
codes regionals & nationals (Cenelec, VDE, NF,...)
guides national (C 15-100, ...)
"product" standards
IEC
In ternational Electrotechnical Commission : more than 40 country representatives, institutional users, manufacturers
MOE - Presentation 8th Oct
The international & american standards The international standard
IEC # previouspublication #general rules 947-1 without equivalencecircuit breakers 947-2 157-1switches 947-3disconnectorsswitches / disconnectors 408combined-fusescontactors and starters 947-4 158-1 & 292-2switching devices 947-5 337for control circuit
multiple function 947-6 without equivalence connection devices part 1 : automatic transfer connection equipmentaccessories 947-7 without equivalence
MOE - Presentation 8th Oct
The international & american standards Standard comparison
combined test overload + endurance
short-circuit on Z sequence single phase
temperature rise temperature rise temperature rise temperature rise limited at 80° limited at 50°C limited at 50°C (linked to the evolution of technologies)
insulation impulse voltage creepage distance creepage distance
label of quality no UL listed materials id. UL(manufacturer follow-up id. ULstandard)
IEC 947-2 UL 489 ANSI 37-50 (PCB)
MOE - Presentation 8th Oct
The international & american standards Presentation of the standards
conclusion
UL & IEC standards are historically and culturally based on different approaches : there are not to be compared
UL & IEC standards guaranty the same level of safety for the end user
UL & IEC standards have the same level of constraints
MOE - Presentation 8th Oct
The international & american standards Content
presentation of the standards
the test sequences• generalities on the tests• the sequences of the UL 489• the sequences of theANSI C 37-50• the sequences of the IEC 947-2
MOE - Presentation 8th Oct
The international & american standards generalities on the tests
two types of test : type test routine test
general principle applied on type test whatever thestandard : calibration main tests : overload, short-circuit final checks : dielectric, tripping
MOE - Presentation 8th Oct
The international & american standards Test sequence IEC 947-2
I all calibration of releasegeneral dielectric withstand
performance mechanical / electrical enduranceoverload (6 In)dielectric withstandverification temperature risetrip-out (1.45 In)
II all rated service S/C breaking capacity (O-C0-CO) Ics dielectric withstand
verification of temperature risetrip-out (1,45 In)
III A calibration of release (2 Ir pole / pole)and rated ultimate S/C breaking capacity (O-CO)
Icu B dielectric withstandtrip-out (2,5 In)
test type testséq. breaker description
MOE - Presentation 8th Oct
The international & american standards Test sequence IEC 947-2
IV B calibration of release (2 Ir pole / pole) rated short-time withstand current Icw verification of temperature rise (80°C at connections)
S/C breaking capacity max. short time withstand current (Icw)dielectric trip-out (2 In)
combined B calibration of releases (2 Ir pole / pole) rated short-time withstand current Ics rated service S/C breaking capacity (O-CO-CO) Icw dielectric withstand
verification temperature rise (80°C)trip-out (1,45 In)
test type testséq. breaker description
MOE - Presentation 8th Oct
The international & american standards The IEC 947-2 & the breaker categories
the IEC defines 2 categories of circuit breakers
Category A : not specifically designed for discrimination under short circuit conditions
Category B : specifically designed for discrimination under short circuit conditions, with an intentional time delay
category B circuit breakers have an additional characteristic :
short time rating : Icw (in KA associated with time)
Icw values: CB < 2500A, Icw above 12 In or 5KACB > 2500A, Icw above 30KA
MOE - Presentation 8th Oct
The international & american standards The circuit breaker , a multi-function
safety device ruled by IEC947-2
more safety by Short Circuit breaking capacities, that are close to the reallity.
more safety for maintenance operation by the disconnection function
more continuity of service and dependability, by the recongnition of coordination between two breaker
MOE - Presentation 8th Oct
The international & american standards a clarification of the breaking capacity
the Ultimate breaking capacity (Icu) - the characteristic to be taken into account, and compared to the prospective short circuit level (3 phases bolted short circuit) for the design of an installation- Icu (kA) represents the maximum fault that the breaker can clear - Icu test = O - CO sequence
the Service breaking capacity (Ics)- expresses the ability of the device to eliminate safely short circuits with a greater likhood of occuring.- Ics is given as a % of Icu- Ics test = O - CO - CO, plus service conditions after breaking
MOE - Presentation 8th Oct
The international & american standards the disconnection function
the disconnection capacity of a circuit breaker is garanteed by 3 test for a maximum of safety :
- shock wave voltage strength (Uimp = 12.3 kV)- maximum leakage current under 110% Un- mechanical test on the handle
the identification by a specific symbol
MOE - Presentation 8th Oct
The international & american standards the disconnection function
the disconnection capacity of a circuit breaker is garanteed by 3 test for a maximum of safety :
- shock wave voltage strength (Uimp = 12.3 kV)- maximum leakage current under 110% Un- mechanical test on the handle
the identification by a specific symbol "circuit breaker - disconnector"
MOE - Presentation 8th Oct
The international & american standards
discrimination, for a maximum of continuity of serviceonly the breaker just above the fault trips
cascading, for substantial savingsthe breaking capacity of C2 can be less than the prospective Isc, but the above breaker C1 will "help" for any short circuit value between Icu2 and Isc
Co-ordination between circuit breaker