Mastoid (Law's POS.)

POS. DIST. GRID OR BUCKY MA. MA. for 600 Speed
LAT. 30 YES 200 200
         

System Speeds

200 400 600
TIME MAS. TIME MAS. TIME MAS.
1/20 10 1/30 6.7 1/40 5
 

Thickness of Part in Centimeters

2 4 5 6 10 12 14 15 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46  
- - - - 60 64 68 72 76 80 84 88 92 - - - - - - - - - - KV

For single phase equipment 8:1 grid ratio - increase 5 KV for 12:1 grid

 

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