Electronics Forum / Electrical Engineering / July 2005

I have a metal detector which is beeping for no reason when people pass
it by with the talkie-walkies. The talkie-walkies use UHF radio waves,
and so I know that I have to somehow block the radio waves. I have
tried chicken wire grids as small as 1cm by 1cm meshes, making a

I am a little new to radio waves and such so I am hoping I won't get
flamed. I am just wondering if anyone can point me to some documents or
something about EMI from RFID. I am concidering putting RFID tags in
all my computers and obviousy dont want to cause undesireable problems.

Revit Building v8.0
ARTCAM INSIGNIA V3.0 DELCAM
GIS FEATURE COL.MODULE V1.2 FOR BOEING SOFTPLOTTER
IRONCAD V8.0 2005

I would like to know if a qpf siemens breaker could replace in a Cutler
Hammer cpm240 load center?
Thank you

Thanks all for the excellent information.  I have been out a few days and
couldn't respond promptly.
The mfg looking for the answer has already made and pre-sold the product,
which is almost "waiting on the shipping dock."  As with many, compliance

Anyone know of any companies who specialise in translating technical German,
French, Italian to English?
Many thanks, Bob

i have this difficult question that i cannot solve:
how is measured the elctric field for the radiated emissions (Re102)?
is it the root mean quare or the peak value? and supposing that the
electric field is measured with one of these values, how these

I am helping a friend with a new house and here is the situation from the
meter (100 amp) to the house (100 amp)
is 600 feet and we calculate we need 600 mcm and the problem is that 500 mcm
will not fit into a 100 amp breaker or lugs for a 100 amp panel so we want

I am interested in wiring a generator to my home
via transfer switch. It is a portable unit, not
built in. My plan is to run a wire in the attic
about 80', from the breaker box/transfer switch,

Why no power options at the school of electrical engineering since the late
1960s?
You can be sure that most new BSEE graduates don't know the difference
between a fault from a bus. Are home grown power engineers as rare as the

We have two submersible pumps (UK Spec) -
Pump 1
250 kW, 4 Pole (1480 RPM), 690 Volts
Pump 2

I've been looking around for a set of standards for grounding
telecommunications equipment in a telecom hut.  Any ideas where I can find
these ?

I have a normal domestic supply to a house in the UK.  I have seen a
printing press that needs 415v.  I assume my house is fed with 240v,
and not transformed within the house down from something else.
Question: if I need to supply 415v to this press, how would I do it?

Not a REC.Radio issue but still appropriate here...
Question: will 1-10khz harmonics riding along on 60 hz power cause
protective MOVs to charge and short out thusly drawing damaging currents.
The scenario: I have an Allen Bradley PLC digital input card and it contains

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These guys can tell you how to fix anything.
Donna