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解析:1.WL1
PC20(2线):1.3+2.2+2.7+2.4+2.4+1.8+1.8+0.6+2.7+3.5+3.8+3.5+(3.3+0.1-1.5-0.8)+(3.3+0.1-2.5)×2+(3.3+0.1-1.3)×2=35.80(m)
PC20(3线):1.5+1.8+1.8+1.8+(3.3+0.1-1.3)×4=15.30(m)
PC20合计:35.80+15.30=51.10(m)
BV2.5mm²:(0.8+0.6)×2+35.8×2+15.3×3=120.30(m)
WL2
PC25:(1.5+0.1)+0.9+1+2+(0.3+0.1)×5=7.50(m)
BV4mm²:[(0.8+0.6)+7.5]×3=26.70(m)WL3
PC25:(1.5+0.1)+3+2.3+(1.4+0.1)×3=11.40m
BV4mm²:[(0.8+0.6)+11.40]×3=38.40m
PC25合计:7.50+11.40=18.90(m)
BV4mm²合计:26.70+38.40=65.10(m)
2.参见表3-Ⅲ-5-5。
3.参见表3-Ⅲ-5-6。