POWER TRIANGLE

 

DECISION Vs EMOTION

POISON

Illumination Levels in Construction site

Examples of recommended minimum target values for building activities as mentioned Below

External lighting:

• Circulation: 10 lx
• Materials handling: 10 lx

Internal lighting:

• Circulation: 5 lx
• Working areas: 15 lx
• Concreting: 50 lx
• Carpentry and joinery: 100 lx
• Bricklaying and plastering: 100 lx
• Painting and decorating: 200 lx
• Site offices: 200 lx
• Drawing board positions: 300 lx

Degree vs education vs behaviour

3 Things to Know in life

Transformer Short circuit calculation at Secondary terminals

• In a simplified approach, the impedance of the MV system is assumed to be negligibly small, so that:

${\displaystyle Isc={\frac {In\times 100}{Usc}}}$

where

${\displaystyle In={\frac {S\times 10^{3}}{U_{20}{\sqrt {3}}}}}$

and:

S = kVA rating of the transformer
U20 = phase-to-phase secondary no-load voltage
In = rated current of the transformer
Isc = short-circuit current in amps
Usc = short-circuit impedance voltage of the transformer in %.