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Guide to units:

HP
=
 Horsepower
kW
=
 Kilowatts
kVA
=
 Kilo Volt Ampere
I
=
 Current (amps)
V
=
 Volts
PF
=
 Power Factor

Calculate Current (amps) when kVA is known
Phase
1, 3 		Generator
kVA 		Volts
Required 		= Ampere
I


Converting kVA to kW
kVA = kW

Converting kW to kVA
kW = kVA


Converting HP to KW
HP = KW


Converting HP to AMPS
HP Volts = Amps


Converting kW to HP
kW = HP


What size genset is needed to start a 3 phase electric motor Direct on
Line (DOL) start
HP of
Motor		 = Generator
kVA Required

Converting Ton A/C to kW
Ton = kW

Converting Ton A/C to HP
Ton = HP

Converting Ton A/C to BTU/h
Ton = BTU/h





Generator Size to Start Motors
Instructions: Fill in the HP of the motor(s) in their starting sequence, select the start method (DOL - Direct On Line or Star Delta) and press Calculate. The required generator size will then be displayed at the bottom.

3 Phase (415 volt @ 50Hz)
1 Phase (240 volt @ 50Hz)
Starting Sequence Motor HP Start Method
DOL / StarDelta		 Run Variable Phase Current Starting Value Total
Run
Current		 Total
Start
Current
1 /
2 /
3 /
4 /
5 /
6 /
Generator Size for Starting with: kVA*
Generator Size for Running with: kVA*
Generator Size Recommended: kVA*

* Please NOTE the above calculations are an estimate only because other factors such as site conditions, motor efficiencies and iron losses are not taken into consideration.


Power Consumption Reference

ApplianceRated WattsRated kVARated kVA
 (Appliances)(To operate appliance)( To start appliance)
Air Conditioner (Evaporative model)275-10000.34-1.251.36-5
Air Conditioner (Reverse cycle)200-25000.25-3.131-12.5
Clothes Dryer240033
Coffee Percolator5500.690.69
Can Opener1000.130.52
Deep Freezer5000.632.52
Disposal Unit6500.813.24
Dishwasher1000-30001.25-3.751.25-3.75
Domestic Water Pumps275-10000.34-1.251.36-5
Exhaust Fan400.050.2
Food Processor5000.632.52
Floor Polisher3500.441.76
Frypan14001.751.75
Hair Dryer15001.881.88
Hotwater Service2500-30003.13-3.753-13-3.75
Iron800-15001-1.881-1.88
Kettle or jug1600-30002-3.752-3.75
Lights25-2000.03-0.250.03-0.25
Microwave15001.881.88
Oven4000-80005-105-10
Radio600.080.08
Radiator1000-25001.25-3.13115-3.13
Refrigerator (home)3000.381.52
Sewing Machine600.080.32
Space Heater20002-52.5
Television75-2000.09-0.250.09-0.25
Toaster250-12500.3-1.560.3-1.56
Washing Machine500-30000.63-3.752.52-15
Welder 140A50006.258 min
Please Note:

Inductive loads (typically electric motors, electric pumps, electric compressors and air conditioners) require 6-8 times more current to start than to run. Most generators can provide 100% overload for start up purposes. A 1 Hp electric motor therefore will require 3-4kVA for start up. Once the 1 Hp electric motor has started, it will only consume 1 kVA leaving a extra 2-3kVA available for other appliances.

Cable & Fuse sizing

Low Voltage XLPE Insulated power Cables
Four Core Copper acc to BS 5467 and IEC 60502-1. Conductor & Current Rating
Nominal Area In air at 40 degC In Ground at 25 degC
sq. mm amps amps
16 88 100
25 115 135
35 140 160
50 175 195
70 220 235
95 265 285
120 300 325
150 350 365
185 410 410
240 480 475
300 570 535
400 660 610

כבלים מנחושת בידוד 70 מעלות סלציוס
כבל רב גידי מעגל תלת מופעי
כבל רב גידי מעגל חד מופעי
שטח חתך (ממ"ר) זרם מירבי נתיך (אמפר) שטח חתך (ממ"ר) זרם מירבי נתיך (אמפר)
1.5 23A 16A 1.5 25A 16A
2.5 29A 20A 2.5 33A 25A
4 36A 25A 4 41A 32A
6 46A 32A 6 52A 40A
10 62A 50A 10 71A 63A
16 79A 63A 16 91A 80A
25 101A 80A 25 116A 100A
35 121A 100A 35 140A 125A
50 146A 125A 50 165A 125A
70 180A 160A 70 203A 160A
95 216A 200A 95 247A 200A
120 247A 224A 120 280A 250A
150 277A 250A      
185 312A 300A      
240 361A 315A      


זרם מרבי וההגנה הנדרשת במוליכים

שטחי חתך, זרם מרבי וההגנה הנדרשת במוליכים וכבלים עשויים נחושת
(טמפרטורת הסביבה 35°)
*אלו נתונים סטנדרטיים למוליכים מנחושת בעלי בידוד ל 70 מעלות

מעגל תלת מופעי – תלת פאזי
(כבל שכולל 3 מוליכי מופע)
שטח חתך
[mm²]		 זרם מרבי
[A]		 נתיך
[A]
1.5 14 10
2.5 19 16
4 26 20
6 33 25
10 46 40
16 63 50
25 82 63
35 103 82
50 124 100
70 159 125
95 192 160
120 222 200
 

מעגל חד מופעי – חד פאזי
(כבל שכולל מוליך מופע ומוליך אפס)
שטח חתך
[mm²]		 זרם מרבי
[A]		 נתיך
[A]
1.5 16 10
2.5 22 16
4 29 20
6 38 32
10 53 50
16 70 63
25 94 80
35 126 100
50 140 125
70 178 160
95 215 200
120 250 224
 
תקנות החשמל-
העמסה והגנה של מוליכים מבודדים וכבלים, תשע"ד-2014

Service Form Customers Calculator KW-Calculator cable installations

Mayron Ltd

Nachlieli 1 Kfar Saba Israel
Tel: ++ 972 505 209 586 E-mail: info@mayron.biz