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Type: Posts; User: Johnhall30

1. Thread: Occ Sensor Control Wiring in same conduit with 277 volt lighting circuit?

by Johnhall30
Replies
10\$\$
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742

You can put low voltage wiring in the same...

You can put low voltage wiring in the same condiut as power conductors as long as the low voltage wiring is rated for 600V (i.e. you could use some #14 THHN)
2. Thread: AFCI required on MWBC?

by Johnhall30
Replies
219\$\$
Views
6,489

The MWBC is serving 120V loads in the dwelling so...

The MWBC is serving 120V loads in the dwelling so they should be protected by AFCI.
3. Thread: Where do we use 1.73 when calculating 3 phase power

by Johnhall30
Replies
23\$\$
Views
1,989

VA = Volts (L-L) x 1.73 x Current (3-phase...

VA = Volts (L-L) x 1.73 x Current (3-phase only)

FLA of each leg in a 3-phase circuit = VA / (Volts (L-L)) * 1.73)

by Johnhall30
Replies
8\$\$
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1,607

The 15 and 30 denotes the Candela setting for...

The 15 and 30 denotes the Candela setting for each device

by Johnhall30
Replies
6\$\$
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569

Although it doesn't specifically say you have to...

Although it doesn't specifically say you have to land the 10' tap conductors into a single set of OCPD, it seems bad practice because the tap conductors aren't fully protected from overloading.

I...

by Johnhall30
Replies
6\$\$
Views
569

Yes the wording in 240.21(B)(1) doesnt...

Yes the wording in 240.21(B)(1) doesnt specifically state you need to terminate in a single OCPD. After more research I believe 408.36 requires make this case require a single OCPD.

408.36...

by Johnhall30
Replies
10\$\$
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1,007

Just submit an RFI and ask him to submit the...

Just submit an RFI and ask him to submit the fault currents.

by Johnhall30
Replies
6\$\$
Views
569

Can tap conductors feeding a dwelling unit meter/load center terminate into two overcurrent protection devices, or does this load center need to have a main breaker?

Alternatively, I could upsize...
9. Thread: Receptacle near Gas Meter?

by Johnhall30
Replies
4\$\$
Views
725

Gas meters must be located at least 3 feet away...

Gas meters must be located at least 3 feet away from an electric meter or other service equipment. I would think it is safe practice to also assume that a receptacle should maintain this clearance...
10. Thread: Low Power factor of CFL and LED lamps (bulbs)

by Johnhall30
Replies
8\$\$
Views
1,935

The harmonic distortion creates uneven currents...

The harmonic distortion creates uneven currents in the neutral conductor, this reducing the efficiency of a balanced 3-phase system. These types of problems can lead to increased voltage drop and...
11. Thread: Help calculating the number of 20 lighting circuits required.

by Johnhall30
Replies
10\$\$
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566

Max continuous load you can put on a 20A circuit...

Max continuous load you can put on a 20A circuit is 16A (80% x 20 = 16). 16A *120V = 1920VA, which is max continuous load allowed on a 20A circuit.

3 lights is 1500VA, 4 lights is 2000VA. 4...

by Johnhall30
Replies
17\$\$
Views
824

Good point. I did not consider the ampacity of...

Good point. I did not consider the ampacity of #12 in MC cable to have an ampacity of 25A. However, the ampacity of #12 NM cable is limited to 20A, correct? MC cable can use the ampacity in the 75ยบ...

by Johnhall30
Replies
17\$\$
Views
824

Conductor derating does not apply to MC cable? ...

Conductor derating does not apply to MC cable?

Table 315.10(B)(3)(a) says - "Number of conductors is the total number of conductors in the raceway or cable,"

by Johnhall30
Replies
17\$\$
Views
824

Wouldn't you have to run 10/6 to the first...

Wouldn't you have to run 10/6 to the first receptacle, because you have 6 conductors in a single raceway? You would have to de-rate the wire by 80%
15. Thread: Calculate the maximum calculated ampere load on the Neutral conductor

by Johnhall30
Replies
7\$\$
Views
466

12kW / 120V = 100A is the line current from one...

12kW / 120V = 100A is the line current from one of the loads, which creates a 100A current in the neutral conductor.

If two loads are connected, the current in the neutral conductor add together...
16. Thread: Trying to understand a 240/120V, 3 Phase system

by Johnhall30
Replies
13\$\$
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1,194

I believe you can calculate the single-phase load...

I believe you can calculate the single-phase load for phase B by: 200A x 208V, because the line to neutral voltage is 208, not 120, on phase B,

by Johnhall30
Replies
12\$\$
Views
1,204

You should bring a neutral to the switch box in...

You should bring a neutral to the switch box in case they want to add a dimmer or occupancy sensor in the future, which might require a neutral connection for the internal electronics.
Run 12/3...

by Johnhall30
Replies
5\$\$
Views
443

Thanks, E1 and E2 are ICC exams E1 is...

Thanks, E1 and E2 are ICC exams
E1 is residential electrical inspector and E2 is commercial electrical inspector.