Table 220.55

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Bishop__8128

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This is a TN Contractors question I am have a hard time applying T220.55::

A 28 unit apartment complex is upgrading the Ranges in each unit, each 18KVA what is the Demand ?

When you are in column C and the # of apliance are over 25....Help!!

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Smart $

Smart $

Esteemed Member
Location
Ohio
15kW +28kW (1kW for each range) + 30% (5% for each kW over 12kW; see note 1)
15kW + 28kW = 43kW... x 130% = 55.9kW

Does TN have an amended T220.55?
 
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Bishop__8128

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Smart $ said:
15kW +28kW (1kW for each range) + 30% (5% for each kW over 12kW; see note 1)
15kW + 28kW = 43kW... x 130% = 55.9kW

Does TN have an amended T220.55?
Click to expand...
I'm not sure, OK I see just add that 15kw ..... what about the 130%

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augie47

augie47

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Location
Tennessee
Occupation
State Electrical Inspector (Retired)
The TN State rules do not amend 220.55, As Smart$ noted, the standard method would be 55.9kw
The 130% comes from Note 1 reflecting the difference between your 18kw range and the 12 kw (6 X 5%)
 
Dennis Alwon

Dennis Alwon

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Staff member
Location
Chapel Hill, NC
Occupation
Retired Electrical Contractor
An 18 kw range is 6kw larger than a 12Kw range so we must multiple the 6 kw * 5%

6 * 5% = 30% = .3

29 Ranges states 15kw + ikw for each Range

15 kw + 18 kw (# of Ranges) = 43

Here is where many people get confused and there are 2 ways to do this

43 kw * 30% (or .3) = 12.9 kw

43 kw + 12.9 kw = 55.9 kw

It is the same answer as multiplying 43kw * 1.3 and nort adding it back to the 43 kw since the 1 in the 1.3 represents the 43 kw already

43 kw * 1.3 = 55.9 kw
 
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