Solar

In a PV system which is grid connecte4d which of the following IS NOT necessary for supplying electricity to the utility company.

Battery string

Which meter category covers 480 volt motor control centers at the breaker?

CAT III

Which category covers 600 Volt ungrounded cable runs or areas outside the building installation?

CAT IV

Name the smallest component of an electrochemical energy storage system (ESS) that stores chemical energy.

Cell

List the components of a battery system in hierarchy of order.

Cell, block, module, pack

When a hard hat is required it is to be a dielectric hard hat. Typically, a class ___ hardhat rated for electrical work up to 20,000 volts is used.

Class E

Which mode most closely defines the microgrids operation in the image show above?

Emergency mode

Which of the following IS NOT an output variable of a combined heat electrical microturbine?

Exhaust temperature

True or False As PV modules are wired in series and parallel voltage and current decrease.

False

True or False As a ground rod is driven deeper into the earth, its resistance is substantially increased.

False

True or False Distributive generation reciprocating engines used for combined heat power generation have a greater electrical output range than gas turbine engines.

False

True or False Electricity (current) will always take the path of least resistance.

False

True or False In current flow, electrons leaving a grounded power supply are trying to get back to earth ground.

False

True or False Sealed maintenance free batteries require an enclosure that is built fior special containment.

False

True or False The earth is some times permitted as an effective ground fault current path.

False

True or False Two 12 VDC. 220 Ah batteries wired in parallel, will deliver 24 VDC @ 220 Ah

False

True or False Under voltage Li ion batteries reading below 7.5v is considered damaged and shouldn't be charged.

False

Which type of connector is used in battery systems that exhibit thermal contraction and expansion, have the need for frequent battery replacement and exhibit limited work space?

Flexible cable

Identify the over current protection devices from the following options.

Fuse

What mode most closely defines the microgrid operation in the image shown above?

Islanded mode

A 24 volt Pb VRLA battery string is positively grounded. What conductor will the disconnect break?

Negative

Which of the following is not a type of distributed generation of electricity?

Nuclear power

An aging battery loses capacity due to:

Obstruction build up in the electrolyte

Which of the following is not tuypical of what a microgrid does?

Optimize energy collection, storage and delivery thus opening up new revenue streams for microgrids

In an ungrounded (floating) PV system, which conductor(s) is (are) switched when disconnected?

Positive and negative

What are the causes for internal short in lithium ion battery?

Separator failure

Which of the following is not a component of a lead acid battery?

Separator made of an insulating membrane.

Which of the following can cause acid hazard in lead acid battery.

Sulfuric acid

Which of the following best describes a 0.5 C rate during a discharge.

The rated discharge current for a 2 hour discharge.

Which of the following best describes a 0.5 C rate during discharge?

The rated discharge current for a 2 hour discharge.

Which type of connector is used in battery systems to comply with the restriction of hazardous substances directive (RoHS)

Tin plated copper connectors

True or False A calibrated torque tool is generally required to achieve the indicated torque value when tightening torque indicated as a numeric value on equipment or in manufacturers installation instructions.

True

True or False A calibrated torque tool is generally required to achieve the indicated torque value when tightening torque is indicated as a numeric value on equipment or in manufacturers installation instructions.

True

True or False Any structure or building with an ESS that is not connected to a utility service source and is a stand alone system shall have a permanent plaque or directory installed on the exterior of the building or structure at a readily visibly location acceptable to the authority having jurisdiction.

True

True or False DC breakers and switchgear are often "uni directional" due to the use of permanent magnets to extinguish arcs, or semiconductor switches.

True

True or False Deep discharging of lead acid batteries will shorten battery life.

True

True or False Flooded batteries need to be overcharged to ensure proper mixing of the electrolyte and avoid stratification.

True

True or False For a DC disconnect, in an ungrounded DC system, both positive and engative conductors are switched.

True

True or False For interconnected electric power production sources, an electric power production source is to be connected to the supply side of the service disconnecting means.

True

True or False Galvanic corrosion is caused by electrically connected dissimilar metals which form a galvanic cell.

True

True or False Galvanic corrosion of a cell casing in a lithium ion battery may cause leakage.

True

True or False Gas pipes and aluminum rods can not be employed as grounding electrodes.

True

True or False Grounding electrodes are usually made of a very conductive type metal (copper or copper clad) with adequate cross sections so that the overall resistance is negligible

True

True or False How it pertains to an ESS, the purpose of an MOP ( method of procedure ) is to pre determine field activities to minimize hazards, protect equipment from damage, and ensure the desired outcome.

True

True or False In a positively grounded DC system, the disconnect will switch (break) the negative conductor only

True

True or False In accordance with Article 705 where two sources, one a utility and the other an inverter, are located at opposite ends a busbar that contains loads, a permanent warning label must be applied to the panelboard to warn others that the inverter output connection circuit breaker must not be relocated.

True

True or False In lead acid batteries, thicker plates and larger acid volume can furnish higher capacity.

True

True or False In solidly grounded two and three wire systems, disconnecting means, overcurrent devices and protection devices such as ground fault detectors and arc fault detectors shall open all ungrounded conductors.

True

True or False It is the installers responsibility to make sure that the lug within the safety switch being ordered is approved for the type of cable intended for the installation of the product.

True

True or False Microgrids systems are sustainable because their energy sources are renewable.

True

True or False OSHA requires that batteries of the unsealed type shall be located in enclosures with outside vents or in well ventilated rooms and shall be arranged so as to prevent the escape of fumes, gases, or electrolyte spray into other areas.

True

True or False Operating voltages and power rating for self contained energy storage systems are typically found on the equipment nameplate data.

True

True or False Space about battery systems must comply with working space required by 110.26.

True

True or False The components of a typical fuel cell include a anode, cathode and electrolyte membrane.

True

True or False The earth is a conductor, but it is a very poor current carrying conductor .

True

True or False The grounded electrode conductor is the designed conductor that is employed to connect the grounding electrodes to other equipment grounding conductors, grounded conductors, and structure.

True

True or False The impedance of the grounding conductor must be low enough that sufficent ground fault current will flow to operate the overcurrent protective devices and clear the fault rapidly.

True

True or False The most significant value of a microgrid system is reliability.

True

True or False The parallel connection of batteries or battery segments greatly increases the potential short circuit current and may change the PPE category and arc flash boundary.

True

True or False The type of system shown in the picture above is known as a nanogrid.

True

True or False Whatever requirements of other articles of this code and article 706 differ, the requirements of article 706 shall apply.

True

Identify constructional hazards for vented lead acid.

damaged battery

Bonding shall be provided where necessary to ensure ___ and the capacity to conduct safely any fault current likely to be imposed.

electricity continuity

This ___ boundary is the farthest away from the energized part which is established as the minimum control boundary to keep unqualified persons a safe distance from exposed live parts.

limited approach

An insulated grounded conductor of ___ or smaller shall be identified by a continuous white or gray outer finish, or by three continuous white or gray stripes along its entire length on other than green insulation.

6 AWG

Insulating blankets issued for service should be retested. The interval between this test shall not exceed ___ months.

6 months

The interval between electrical retest for issued voltage rated rubber gloves shall not exceed ___months.

6 months

DC microgrids with a system voltage of greater than ___ volts shall be required to have an arc fault protection for utilization circuits.

60 volts

How much time will an All Cell lithium ion battery take to discharge at 5C?

12

Voltage rated gloves that have been electrically tested but not issued (used) shall not be placed into service unless they have been electrically tested within previous ___ months.

12 months

Which of the following is the most common voltage for batteries comprising an energy storage system?

12 volts

What is the nominal capacity of an AllCell Lithium ion battery?

124.8Ah

Four 6 volt lead acid batteries are connected in series. What is the nominal voltage of the battery string.

24 volts

According to the NEC, battery circuits subject to field servicing, where exceeding ___ volts nominal between conductors or to ground, shall have provisions to disconnect the series connected strings into segments not exceeding 240 volts nominal for maintenance by qualified persons.

240 volts

PPE category 3 must provide protection up to ___ calories/cm from potential arc fault energy.

25 calories/cm

OSHA requires eyewash station within ___ feet of battery handling area.

25 feet

A single electrode consisting of a rod, pipe, or plate which does not have a resistance to ground of ___or less shall be augmented by one additional rod of any of the types specified in the NEC.

25 ohms

Employers are required to retrain employees on NFPA 70E, electrical safety in the workplace, at a minimum if every ___ years.

3 yrs

If the cell voltage = 3.7 volts and charge capacity = 9.6 Ah, calculate the total voltage and total charge capacity for a module of 48 cells connected in parallel.

3.7V, 460.8 Ah

DC microgrids operating at voltage greater than ___ Vdc shall be reference grounded or resistively grounded.

300 vdc

PPE category 1 must provide up to ___ calories/cm from potential Arc flash thermal energy.

4 calories/cm

DC microgrids operating at greater than ___ Vdc shall have ground fault protection.

50 vdc

Live parts that operate at less than ___ volts to ground need not be de energized if there will be no increased exposure to electrical burns or to the explosion due to electric arcs.

50 volts

Overcurrent protection shall not be required for conductors from an ESS with a nominal voltage of ___ volts or less if these conductors provide power for starring, ignition, or control of prime movers.

50 volts

Two wire DC systems supplying premises wiring operating at a voltage greater than ___ volts but not exceeding ___ volts are required to be grounded.

50 volts, 300 volts

Which of the following is not a familiar battery chemistry?

Aluminum hydroxide

Batteries are rated according to ?

Amp hours

Connection to concrete encased electrodes... that portion of the conductor that is the sole connection to the grounding electrode shall not be required to be larger than #___ AWG copper wire.

#4 AWG

Connection to rod, pipe or plate electrodes... that portion of the conductor that is the sole connection to the grounding electrode shall not be required to be larger than #___ AWG copper wire.

#6 AWG

Ungrounded conductors of ___ AWG or smaller shall be permitted to be identified by polarity at all termination, connection, and splice points by marking tape, tagging, or other approved means.

#8 AWG

If a protective device rating is marked on an appliance, the branch circuit overcurrent device rating shall not exceed ___ percent of the protective device rating marked on the appliance.

100

At what voltage arch flash PPE are required.

Above 100V

What PPE should be used to deal with lead acid chemical hazards?

Acid resistant gloves

Battery specification include:

All of the above

Which type of inverter produces AC power to regulate PV array battery charging, sends excess power to the grid and stands alone during grid outages?

Bi-modal inverters

Which of the following IS NOT a value added by microgrids?

Bulk generation

In order to mitigate solar PV variability which of the following could be used? a. inverter smoothing / curtailment b. forecasting and ramp rate control c. energy storage. d. All of the above

D. all of the above

The percentage of battery capacity that has been discharged expressed as a percentage of maximum capacity is:

DOD

Even when installed outdoors, due to the corrosive nature of battery chemistry, in a large number of applications, stainless steel hardware is used. Type ___ is generally the metal of choice for batteries employed in high rate applications.

Type 316

Which of the following is an example of a large remote microgrid?

University campus