[Amps] 4 wire 240VAC service? What to do now?

[Doug Renwick]

I looked at my Federal Pioneer sub panel and I do not see a neutral to
enclosure (ground)  bonding screw or any where a screw has been removed.

Doug

>-----Original Message-----
>
>On 4/4/2011 12:22 PM, TexasRF at aol.com wrote:
>> In a typical sub panel, is the buss bar that is used to common the
>> neutral leads insulated from the box chassis? I have installed a
>> couple of sub panels through the years but never paid any attention to
>> that.
>
>All panels are built with a neutral bus that is insulated from the steel
>enclosure. In most, there is a large bonding screw that shorts the
>neutral bus to the enclosure.  If the neutral bond is not permitted,
>this screw must be removed.  Not all electricians know that this
>matters, but it is critical. Indeed, extra neutral-to-ground bonds are
>one of the most common wiring mistake in buildings.
>
>An easy way to sniff for this is with an AC voltmeter that has a good
>low volts scale. Connecting the meter between ground and neutral any
>where in the system except at the bonding point, you should see some
>small voltage, typically less than a volt or so. If you see zero,
>there's a neutral to ground short close by.
>
>73, Jim Brown K9YC
>_______________________________________________