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NF50-HRP Datasheet(PDF) 73 Page - Mitsubishi Electric Semiconductor |
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NF50-HRP Datasheet(HTML) 73 Page - Mitsubishi Electric Semiconductor |
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73 / 105 page  72 Fig. 6.14 Relation of Let-through Current to Time until 600V Vinyl-Insulated Wire Reaches a 70 °C Temperature Rise. (In a Start from No Load State at Ambient Temperature of 30 °C) Fig. 6.15 MCCBs and Wiring Sizes 15 20 30 40 50 60 75 100 125 150 175 200 225 250 300 350 400 Wire size (mm2) MCCB rating(A) Unprotected region Protected region Fig. 6.16 Wire Derating Method, for Conduit Routing Current ( ×102A) 1000 800 600 500 10 0.2 0.4 0.5 0.6 0.3 1 0.8 2 3 10 920 30 40 50 100 1000 200 300 500 80 60 8 7 6 5 4 0.1 6 5 4 3 2 1 20 30 40 50 60 100 200 300 400 Wire sizes (mm2) =Correction factor !2 !1 !1 !2 Current Open wiring Routed in conduit ground use; ultimately, the temperature figure of 75 °C is derived (100 °C per Jones and Scott, compensated) as a suitable short-time limitation for wiring with heat- proof vinyl or styrene-butadene-rubber insulation. Current transpositions for the range of wire sizes are not presented, being non-standard ; however, Fig. 6.15 gives MCCB ratings for temperature limitations of 30 °C in normal operation, and 75 °C for periods of up to 20 seconds. The apparent disparity of the ambient ratings of 30 °C for wiring against 40 °C for MCCBs, is reconcilable in that wiring, for the most part, is externally routed, while MCCBs are housed in panelboards or the like. The two figures can be used compatibly, without modifi- cation. It is further noted that, where MCCBs with long- delay elements of the thermal type are employed, the effect of increased ambient, which would normally derate the wiring, is adequately compensated by the attendant decrease in thermal-region tripping time of the MCCB. The curves in Fig. 6.17 show the comparison of the delay regions of MCCB tripping with allowable cur- rents in open-routed wiring. Fig. 6.16 shows the method required by the Japanese standards referred to above, for derating wiring to be routed in conduit. |
Similar Description - NF50-HRP |
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