8 MB - POWERLAB

InstallationrecommendationsDerating in switchboards 0Factors affecting switchboard designThe temperature around the circuit breaker and itsconnections:This is used to define the type of circuit breaker to beused and its connection arrangement.Vents at the top and bottom of the cubicles:Vents considerably reduce the temperature inside theswitchboard, but must be designed so as to respect thedegree of protection provided by the enclosure.For weatherproof heavy-duty cubicles, a forcedventilation system may be required.The heat dissipated by the devices installed in theswitchboard:This is the heat dissipated by the circuit breakers undernormal conditions (service current).The size of the enclosure:This determines the volume for cooling calculations.Switchboard installation mode:Free-standing, against a wall, etc.Horizontal partitions:Partitions can obstruct air circulation within theenclosure.Basis of tablesb switchboard dimensionsb number of circuit-breakers installedb type of breaker connectionsb drawout versionsb ambient temperature outside of the switchboard: T a (IEC 60439-1).Masterpact NT06-16 H1/L1 (switchboard 2000 x 400 x 400)Type NT06 H1/L1 NT08 H1/L1 NT10 H1/L1 NT12 H1 NT16 H1Switchboard composition4321Connection typeBusbar dimensions (mm) 2b. 40 x 5 2b. 50 x 5 3b. 63 x 5 3b. 63 x 5 3b. 80 x 53b. 50 x 5 3b. 63 x 5Ventilated switchboard 4 H1/L1 H1/L1(➨ IP31)3 630 630 800 800 1000/1000 1000/1000 1250 1250 1400 1520T a = 35 °C 2143 630 630 800 800 1000/950 1000/1000 1250 1250 1330 1440T a = 45 °C2143 630 630 800 800 1000/890 1000/960 1200 1250 1250 1340T a = 55 °C21DB101494Non ventilated switchboard(➨ IP54)43 630 630 800 800 1000/960 1000/1000 1250 1250 1330 1400T a = 35 °C 214T a = 45 °C3 630 630 800 800 1000/910 1000/980 1220 1250 1260 1330214T a = 55 °C3 630 630 800 800 1000/860 1000/930 1150 1230 1200 126021DB101495Note: the values indicated in these tables have been extrapolated from test data and theoreticalcalculations. These tables are only intended as a guide and cannot replace industrial experienceor a temperature rise test.111