Re: HELP!! Need answers for test!!! Part 2

["mbbaker@xxxxxxxxx" <mbbaker@xxxxxxxxx>]

Gator wrote:
> What is the maximum allowable voltage drop for an audible
> device?5,10,15 or 20%

NFPA 70-2002 215.2(A)4 FPN 2 suggests limiting all branch circuits to
no more than 3%.  5% overall when considering the feeder.

NFPA 70-2002 110,3(B) requires that listed and labeled equpment be
installed in accordance with the manufacturer's documentation.  In
other words, the maximum voltage drop permitted is the difference
between the power source and the device's minimum nameplate voltage.

> What is the maximum distance 18 AWG wire is suitable for a self
> contained siren?

How much current does the siren require?  What's its minimum nameplate
voltage?  1-strand 18AWG or 7-strand?  Aluminum, copper (coated or
uncoated), or copper-clad alumunum?

> What is used to reduce current?resistor or capacitor?

A resistor can be used to limit current.

Happy holidays,

Mike

--
Michael B. Baker, SET
Michael Baker & Associates, Inc.
PO Box 737
Gladstone, OR 97027-0737
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