Convertion

kW -> KVA = /0.8

kW->Amp = x 1.64 (3phase)
= x 4.9 (1phase)

BTU->Tonnage = /12000
BTU->hp = /9000
hp->kW = x0.746

1sq.m = 10.76sq.f

Tatahan MCCB (untuk TNB submission)

Data Beban
1. Kadar MSB = 150A TPN
2. Beban Sambungan = 122.76kW
3. Kehendak Maksima = 77.74kW
4. Nisbah Transformer Arus = 150/5A

Cadangan Tatahan MCCB
1. Arus Membawa Berterusan = 127.50A TP (77.74kW x 1.64)
2. Arus Lebihan
a) Melantik 60 Saat = 140.24A TP (127.50 x 1.1)
b) Melantik 5 Saat = 153.00A TP (127.50 x 1.2)
3. Arus Bocor Ke Bumi = 10% Dari Nisbah Transformer Arus

Basic Aircond & Exhaust Fan Calculation

1 sqmeter = 10.7 6 sqfeet

Aircond
12sqm x 10.76 (luas) = 130sqf x 65 BTU/hr/sqf
=8450 BTU/hr
~ 9000 BTU/hr

* 9000BTU = 1 hp = 300CFM = 0.746kW

Exhaust Fan
6.8sqm x 10.76 (luas) = 73.2sqf x 10'(H) x [10/50](air change)
=150CFM

formula untuk convert kilowatt (kW) kepada Ampere (A)

Single Phase-> 1000 / (240 x 0.85) = 4.9

Three Phase-> 1000 / (/3 x 415 x 0.85) = 1.64


contoh:-
Beban = 15kW

Single Phase-> 15kW x 4.9 = 73.5A

Three Phase-> 15kW x 1.64 = 24.6A