PLEASE EXPLAIN
Heated driveway?

Commercial snow melting. (E.g. TOYOTA + ELEKTRA).

HYPOCAUST. Made in GREECE and ROME

ONDOL - The Korean invention

American Legend: Architect Frank Lloyd Wright

From STONE COLD to NICE WARM floors in just 2 hours?

New Kitchen Project. (Part 1)

New Kitchen Project. (Part 2)

Radiant heating in one day?

From cold slab floor to comfort and beauty.

How to connect UCCG-9991 programmable thermostat for radiant floor heating?

How to connect MTC-2991 manual thermostat for radiant floor heating?

How to choose the in-floor radiant heat ELEKTRA mat?

Many components of the Great Real Estate. (Part 1).

Many components of the Great Real Estate. (Part 2).

How to connect more than 1 mat?

The problem on the roof

Installing radiant floor heating in just one afternoon.

Cathedral ceilings effect & Medieval Hypocaustum (floor heating)

STEP-BY-STEP INSTALLATION




How Many Amps?



'How Many Amps?' This is GUARANTEED to be the first question from your electrician.


How do I determine how many Amps the particular system has?

It is quite simple:



The correct answer to this GURANTEED first question your electrician is going to ask you, would depend on two factors: How many Watts, and whether 120 Volts or 240 Volts is used. Total Amperage (current) can easily be calculated from the formula

Formula:
P = V x I 
  Where:
    P - power (Watts),
    V - voltage (Volts),
    I - current (Amps)


E.g. The system is made of several mats. Each is 100W, voltage is 120V, so Amperage is:


100W/120V = 0.83 Amp. FOR EACH MAT!

 

The total Amperage of the system is the sum of the individual components (mats). Two 100W mats = 1.66 Amp, Three 100W mats = 2.5 and so on…

 

SCENARIO: You have 3 of 480 Watts 120V mats in the floor. The electrical receptacle in the bathroom is on the same circuit as the floor heating. Then someone plugs in a 1600 Watts hair blower. How much current would all of it draw? And don't forget about the 100 Watt ceiling light!
What is wrong with this picture?
Answer: A dedicated line was and is needed!


Never allow for overloading of existing lines! ...and this is why your electrician is going to ask you about Amps for this new floor heating idea of yours.

HINT: Installing one couple hundred Watts mat is well within the abilities of a handyman but it is often too much when large systems are planned. Seeking advice of a licensed electrician before ordering heating mats may prove invaluable as many installation scenarios require correct assessment of the existing circuits and electrical panels.

 

Where all this science comes from? Ohm's Law, but Mr Ohm wasn't a lawyer:

 

Note that P from the formula above is being represented here by W (Watts):

OHM'S LAW EQUATIONS

OHMS
VOLTS ÷ AMPERES
VOLTS ² ÷ WATTS
WATTS ÷ AMPERES ²

 

VOLTS
SQRT ( WATTS × OHMS )
WATTS ÷ AMPERES
AMPERES × OHMS

 

AMPS
VOLTS ÷ OHMS
WATTS ÷ VOLTS
SQRT ( WATTS ÷ OHMS )

 

WATTS
VOLTS ² ÷ OHMS
AMPS ² × OHMS
VOLTS × AMPS

 

Few not so trick questions:


Ever wonder why your car jumpstart cables are so THICK ?

 

Because Volts are so low! The car has only 12 Volts electrical installation! Because of low Voltage the Amps are quite high, thus: a physical need for thick cables! By the same token that is why home appliances using lots of Watts (wall AC's, kitchen range, electric boiler etc) are using 230-240V Voltage! Look at the plug! It is different!

 

Can you use the spare bulb from your car on the porch light?

 

Although it seems like a ridiculus question: why not?

It will not fit but even if it will unfortunatelly it will only last fraction of the second. This said, you would not want to bother or take the chances like this.

Your house electrical installation uses 10 times more Volts as your car! The bulb would burn out right away!

By the same token if the floor heating mat or cable is meant for 110-120 Volts i cannot be used with 230-240 Volts! It will most likely last longer than seconds or even weeks, but not very long all.


Example #1, if you wish to find the watts ( W ) of a circuit and you know the voltage ( E ) is 12 volts and the amperage ( I ) is 4 amps substitute the numbers into the equation:
W = E × I ..... W = 12 × 4 ...... 48 watts

Example #2, if you wish to find the amperage ( I ) of a circuit and you know the voltage ( E ) is 12 volts and the wattage ( W ) is 200 watts substitute the numbers into the equation:
I = W ÷ E ..... I = 200 ÷ 12 ...... 16.66 amps

 

What's wrong with this picture?

 

Problem:

Several 120V mats (total coverage 180 sq.ft.) piggybacked to an existing 120V 15Amps circuit! The mats total 1700Watts or over 14 Amps. UNACCEPTABLE!

 

Solution:

120V mats replaced with 230V models.

Total Amperage: 7.

Dedicated 20A 230V line run from the panel and the badly cut wall repaired.

 


Please remember: Electricity can be deadly and wiring done incorrectly can kill and start deadly and destructive fires even when "just replacing one small receptacle". 

YOU ARE DEALING WITH LINE VOLTAGE, not low voltage! 

NEVER EVER attempt to work or even touch the inside of the electrical components without being 100% sure that the power is disconnected!

If you are not an electrcian and if you have the slightest doubt about your wiring ability, please contact a licensed electrician and/or repairman before doing any diagnosis, repairs or installations. The products shown here are deemed SAFE and sound by various testing authorities but the wiring process can only be SAFE when done with safety precautions. Please read manuals and/or ask pros when not sure. Most of the simple installations shown here can be done by yourself or you can have someone qualified do it for you and THEN have the electrician check it and connect it to power.    

 


Feedback is something that really keeps us going.

Please comment on the FORUM or send us your comments or requests for any specific topic that you would like us to feature.




Learn More

  Time to say goodbye to STONE-COLD floors? YES.
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  How to choose the right floor heating product for the application.
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