Dedicated line w/ upgraded parts or power cond?

I'm somewhat confused(easily),can I safely use a 30 amp breaker if I wire the ground to the proper ground strip in the panel,even if my receptacles are 20 amp?
06-06-13: Lacee

NO, not per NEC code or your local AHJ.

Why would you want to? The current carrying guts inside a 20 amp breaker are the same as a 30 amp breaker. The difference between the two breakers is the thermal and magnetic trip mechanism.

A 20 amp Square D QO breaker will pass a one cycle inrush current of about 120 amps before it trips open.

A 30 amp QO will pass an inrush current of close to 300 amps for about 8 to 10 cycles before it trips open.

A 20 amp breaker will handle any dynamic peak current pulses from your power amp without any problem.
.

Whart,

Not all electrical inspectors are created equal. With that said the one you are dealing with, for your area, usually has the final say.

The out building needs to be considered a commercial space and not a residential dwelling unit to meet NEC code Article 647.

Use the word commercial space when talking with the AHJ, Authority Having Jurisdiction, when getting an electrical permit. When the inspector comes out to inspect the installation make sure when referring to the out building, refer to the space as a commercial space and not as a residential habitable space. There is a big difference between the two in the eyes of NEC code.

One other thing worth noting is zoning. Is the area you are buying the house with the out building zoned residential only or residential/light commercial?

[Quote] from Link below:

ARTICLE 647 -- SENSITIVE ELECTRONIC EQUIPMENT
647.1 Scope. This article covers the installation and wiring of separately derived systems operating at 120 volts line-to-line and 60 volts to ground for sensitive electronic equipment.

647.3 General. Use of a separately derived 120-volt single-phase 3-wire system with 60 volts on each of two ungrounded conductors to a grounded neutral conductor shall be permitted for the purpose of reducing objectionable noise in sensitive electronic equipment locations provided that the following conditions apply.

(1) The system is installed only in commercial or industrial occupancies.
(2) The system's use is restricted to areas under close supervision by qualified personnel.
(3) All of the requirements in 647.4 through 647.8 are met.

647.4 Wiring Methods.
http://www.equitech.com/support/647.html
.

Lacee,

I also like to attach the dedicated ground wire to the main ground wire directly instead of inside the panel to the ground strip where all the other ground wires are connected.
06-02-13: Lacee

Per code the safety equipment ground wire has to connect to the ground bar in the electrical panel the branch circuit is fed from.

(Exception: An IG, insulated isolated equipment grounding conductor, for an IG grounding type receptacle can pass through a sub panel/s and connect to the main service electrical panel where the main service neutral is connected to earth.)

Also,I am now upgrading to 10/2 romex and 30 amp breakers,yes it's overkill,but not dangerous is it?
06-02-13: Lacee

#10 awg is fine but if the receptacle is a NEMA 5-15R (15 amp) duplex receptacle the breaker can be a 15 or 20 amp max per code. 15 amp breaker, 15 amp branch circuit. 20 amp breaker, a 20 amp branch circuit.

If a NEMA 5-20R receptacle is used the branch circuit breaker has to be a 20 amp. Minimum size awg wire #12 copper. Again #10 awg can be used. You just cannot connect the hot to a 30 amp breaker.

http://www.aes.org/sections/pnw/pnwrecaps/2005/whitlock/whitlock_pnw05.pdf
.