in the real world, do we really need to do the voltage drop calculation? - Page 4 - Electrician Talk - Professional Electrical Contractors Forum
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Old 08-09-2017, 06:05 PM   #61
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Quote:
Originally Posted by HackWork View Post
Can someone let me know if Essex answered RePhase's question? Thanks.
He has not yet. But I'm on chapter 2 of a textbook on condensed matter physics, trying to get to the bottom of it.
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Old 08-09-2017, 06:07 PM   #62
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in the real world, do we really need to do the voltage drop calculation?-screen-shot-2017-08-09-6.05.25-pm.png

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Old 08-09-2017, 06:37 PM   #63
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Is this a joke thread or is this for real?

The first and foremost covenant of code compliance is life safety (preservation of human life).
Protection of property is a very far second.
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Old 08-09-2017, 06:46 PM   #64
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Originally Posted by RePhase277 View Post
He has not yet. But I'm on chapter 2 of a textbook on condensed matter physics, trying to get to the bottom of it.
You're going to need a quantum leap in learning.
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Old 08-09-2017, 06:48 PM   #65
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There is one section of the code that does require voltage drop be considered and that is for fire pumps. I did not read the entir thread so this may be known

I use the vd calculator when I have long runs to outbuildings etc


Quote:
695.6(B)(2) Fire Pump Motors Only. Conductors supplying only a
fire pump motor shall have a minimum ampacity in accordance
with 430.22 and shall comply with the voltage drop
requirements in 695.7.


Quote:
695.7 Voltage Drop.
(A) Starting. The voltage at the fire pump controller line
terminals shall not drop more than 15 percent below normal
(controller-rated voltage) under motor starting conditions.
Exception: This limitation shall not apply for emergency
run mechanical starting. [20:9.4.2]
(B) Running. The voltage at the load terminals of the fire
pump controller shall not drop more than 5 percent below
the voltage rating of the motor connected to those terminals
when the motor is operating at 115 percent of the full-load
current rating of the motor.
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Old 08-09-2017, 08:56 PM   #66
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Have you ever gone into a home and turned everything on and used an Amp Meter on the Main Breaker Panel. I have.
3200 sq ft home, double oven, 2 AC units, dishwasher, microwave, hair dryer, clothes dryer, Pool, and all lights on was 180 amps on one leg, 173 on the second leg.
A condo is probably no where near 200 amps in actual usage.
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Old 08-09-2017, 09:00 PM   #67
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I recently measured a 2,100 square ft. home with 240v Range, microwave, disposal, 240V dryer, AC, 60Amp Hot Tub, pool, hair dryers, coffee pot, toaster and all lights On, was 125amps on each leg.
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Old 08-09-2017, 11:07 PM   #68
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Quote:
Originally Posted by Dennis Alwon View Post
There is one section of the code that does require voltage drop be considered and that is for fire pumps. I did not read the entir thread so this may be known

I use the vd calculator when I have long runs to outbuildings etc
I know this is the general electrical section, but OP is is Canada.
It is in our code.

8-102 Voltage drop (see Appendices B and D) (1) The voltage drop in an installation shall be based on the connected load of the feeder or branch circuit if
known; otherwise it shall be based on 80% of the rating of the overload or overcurrent device protecting the branch circuit or feeder, and not exceed (a) 3% in a feeder or branch circuit; and (b) 5% from the supply side of the consumerís service (or equivalent) to the point of utilization.
(2) Notwithstanding Subrule (1), where overcurrent devices are selected in accordance with other Sections of this Code, the voltage drop shall be based on the calculated demand load of the feeder or branch circuit. (3) Notwithstanding Subrule (1), wiring for general-use branch circuits rated at not more than 120 V or 20 A
in dwelling units, with the conductor length measured from the supply side of the consumerís service to
the furthest point of utilization in accordance with the values in Table 68, shall be acceptable. (4) Notwithstanding Subrule (1), at industrial establishments where conditions of maintenance and
supervision ensure use by qualified persons, the design shall ensure that the voltage at the point of utilization is within the rating or voltage tolerance of the connected device(s).


I was mostly Industrial, and never saw this enforced.
I guess they figure if you want to underfeed a motor, it's on your dollar.
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Old 08-09-2017, 11:13 PM   #69
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Quote:
Originally Posted by HackWork View Post
Can someone let me know if Essex answered RePhase's question? Thanks.
Can't help on this one
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Old 08-10-2017, 07:19 AM   #70
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Quote:
Originally Posted by lighterup View Post
Can't help on this one
I wish Essex would just answer the question. I got to chapter 3 of the physics text before the math got so hairy. I'm on chapter 1 of a math text now. I'll get this question answered, but it would be much easier if Essex would just tell me.
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