What is the minimum copper conductor size for a Ring Circuit? (a) 1.5mm^2 (b) 2.

Question

What is the minimum copper conductor size for a Ring Circuit? (a) 1.5mm^2 (b) 2.5mm^2 (c) 4mm^2 (d) 6mm^2 Which of the following cannot be used for overcurrent protection? (a) MCCB (b) RCCB (c) OCEF relay (d) HRC fuse In a kitchen, a stove with a current rating exceeding 15A should be fed from an exclusive radial final circuit and controlled by a double-pole switch places within? (a) 2m (b) 2.5m (c) 3m (d) 3.5m Which of the following cable insulations has the highest permissible operating temperature? (a) XLPE (b) Rubber (c) PVC (d) Impregnated paper The test voltage to measure the insulation resistance of 400Va.c. circuit should be? (a) 1000V a.c. (b) 1000V d.c (c) 500V a.c. (d) 500V d.c In a 32A radial circuit, the minimum copper conductor size is? (a) 1.5mm^2 (b) 2.5mm^2 (c) 4mm^2 (d) 6mm^2 Lighting final circuits should be electrically separated from power circuits except that it may be connected to? (i) bell transformer (ii) electric clock (iii) exhaust fan (iv) ELV circuit (a) (i) & (ii) (b) (i), (ii) & (iv) (c) (ii) & (iv) (d) all Lighting final circuits should be electrically separated from power circuits except that it may be connected to? (i) bell transformer (ii) electric clock (iii) exhaust fan (iv) ELV circuit (a) (i) & (ii) (b) (i), (ii) & (iv) (c) (ii) & (iv) (d) all

Explanation / Answer

(1) generally for a ring circuit upto 32 A we use the conductor of 2.5mm^2 cable .

(2)MCCB basically a over load protection device and all theremaining are over current protection device

(4) the impregnated paper will have the high insulation resiatnce because it resitivity in order of 10^7 ohm-m

(5)the test voltage for the :

test voltage =2*name plate voltage +100=2*400+100=1000Va.c

(6) for 32A we use 2.5mm^2 copper conductor

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