Standby and Emergency Systems

In general, this NAC article deals with emergency systems

In EC article 700

What are the quarterly checks for battery maintenance

Individual sale voltage, individual sale electrolyte specific gravity, pilot sale electrolyte temperature, enter sale connection resistance, sale impedance, conductance, and resistance, and ambient temperature

This is an electronically controlled, solid-state power control system designed as an alternate source to provide regulated AC power to critical loads in the event of a partial or total failure of the normal source of power, typically the power supply about the electric utility

Static uninterruptible power supply

Hey third time delay usually adjustable from what, is provided to allow for generator set engine cool down

0 to 10 minutes

What is the specific gravity of sulfuric acid when discharged and near full charge

1.15 and 1.28

The nominal open circuit voltage of a nickel cadmium sale is what

1.3 V

In the event of failure of the normal power supply, emergency lighting, emergency power, or both must be available within the time required for the application, but not to exceed how many seconds for emergency systems

10 seconds

Battery starter system is used with generator sets are usually how many volts

12 to 24

Once the starting and running loads have been determined, it is common to add a margin factor of up to what for future expansion or to select a generator set of the next largest standard rating

25%

For fuel efficiency, the running load should stay within approximately what of the generator set kilowatt rate

50 to 80%

UPS systems may provide single phase or three phase power at what frequencies

50, 60, or 400 Hz

A bone loss of normal power, legally required systems are required to be able to supply standby power and how many seconds or less

60 seconds

Hey general rule of thumb is that for every 15° above what, the life of the battery will be reduced by what

77° and 50%

Any battery that exhibits less then what time capacity is considered failed and should be replaced

80%

When AC charging power is restored, this will deliver more current than would be necessary if the battery or fully charged

A constant potential charger

What does an AC generator consist of

A rotor also known as the Armature, and stater, with the shaft of the rotor being driven by the engine

The excitation system for a typical generator is controlled by what

A voltage regulator

This converts rotating mechanical energy, typically supplied by an air or water cooled diesel or gas engine, into electrical energy

And AC generator also known as an alternator

Whendude life safety branches not half to be Independent from all other wiring

And transfer switches, and exit or emergency lighting fixtures supplied from two sources, and a common junction box attached to exit or emergency lighting fixtures supplied from two sources

This automatically transfers electrical loads from my normal source, utility power, to an emergency source, generator say it, when the normal source files or it's voltage is substantially reduced

Automatic transfer switch

This time delay is provided to avoid unnecessary starting and transfer of the generator set power source for power interruptions of short duration

Between zero and 15 seconds

In the systems, the incoming AC power is first rectified and converted to DC, then supplied his input power to a DC to AC converter

Double conversion UPS systems

The systems are intended to automatically supply illumination and or power to designated areas and equipment in the event of failure of the normal supply or in the event of an accident two elements of a system intended to supply, distribute, and control power and illumination for safety of human life

Emergency systems

In almost all areas throughout the United States, all public buildings must have what and what connected to an emergency electric system

Exit lights and emergency white lights, Fire alarm systems, life safety systems, and sprinkler system water pumps

Generator engines are generally what cycle units having how many cylinders

Four cycle units, 1 to 6 cylinders

How are transfers which is sized

It is Baystone they calculated continuous current, in a manner similar to sizing the circuit conductors

What are the two types of batteries used with generators

Lead acid or nickel cadmium

The systems are intended to automatically supply power to selected loads in the event of failure of the normal source

Legally required standby systems

These must be kept entirely independent of all other wiring and equipment and must not enter the same raceways, boxes, or cabinets with each other or other wiring

Life safety branch and critical branches

What are some disadvantages of double conversion UPS systems

Lower efficiency, large DC power supply required, for noise isolation from line to load, and possible shortened service life due to greater heat dissipation

The most common generator set arrangement has a what and what to cool the coolant and ventilate the generator room

Mounted radiator and engine driven fan

This article covers assembly occupancies, that is, I'll buildings or portions of buildings or structures designed or intended for assembly of how many people

NEC article 518, 100 or more persons

This battery has the most rugged of the battery technologies, mainly because of its durability and extreme temperature environments

Nickel cadmium

The systems are intended to supply site generated power to selected loads either automatically or manually

Optional standby systems

In the system the incoming line is not rectified to produce DC power to provide input to the member. We normally see power is supplied directly to the critical loads through a series of inductor or transformer

Single conversion UPS systems

The field windings of an AC generator are energized by DC source called what

The exciter

What happens to and overcharged lead battery

The positive plate is destroyed

How can the voltage be changed in a generator

The voltage induced and H stater winding depends on the strength of the magnetic field and the velocity with which the lines of force cut across the windings

A central electrical systems for hospitals must be compromised of how many systems capable of supplying a limited amount of lighting and power service considered essential for life safety safety and effective hospital operation

Two separate systems

The nominal open circuit voltage of a lead acid sale is what

Two volts

Once the load has been transferred to the generator set, another time or delay switching back to the normal source for an adjustment delay. Until the source has had time to stabilize

Typically up to 30 minutes

This is commonly referred to as a system consisting of a dedicated stationary type battery, rectifier or battery charger, static inverter, and accessories such as a transfer switch

UPS