Professional Home Inspector February 2018
PROFESSIONAL HOME INSPECTOR
"Dedicated To Training & Information For The Professional Home Inspector"
This month's Tech Tip is about Electric Sub-Panel Inspection and the reason why the neutrals and grounds must be separated.
We have changed the forum link in the right column to our new website: www.homeinspectortrainingonline.com. This site is full of training and installation videos for home inspectors. Check it out!
The 7th annual Niagara Frontier Home Inspectors Conference was a huge success! Thanks to all the home inspectors who attended and the great sponsors and trainers! Check out some pictures from the event below and save the date for 2018; October 19-20
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Is It Possible to Document a This Month's Tech Tip: Roof Inspection in Under 5 Minutes? Click Play to find out
Electrical Sub-Panels - Why MUST the neutrals & grounds be separated
As home inspectors we know that the grounds and neutrals must be
separated in any sub panel. We also know that a sub panel should be supplied
from another electric panel with 4 conductors. I have had
"electricians" tell me that that code is overkill and unnecessary. I
have heard different explanations on the reasons for this. I have also heard
"electricians" say the neutral does not carry current. CLICK HERE for a great video showing a
live demonstration. Let's start with that neutral wire, which is actually a
current carrying conductor. Because the neutral conductor appears to have
no voltage because there is no resistance. However if a person becomes part of
the circuit, the voltage will form across thier body. In a electrical circuit
all of the current from the hot conductors will travel on the neutral
conductors back to the service panel. If we bond the ground wire to the neutral
in the sub panel, current will flow on both the neutral and ground. If the
ground and neutral conductors are not kept separated, current will flow on the
ground wires back to the panel supplying the sub panel. In addition to the
dangers (shock hazards) of current flowing on the ground conductors, it could
cause equipment interference, cause issues with GFCI’s. Another issues is
magnetic fields not cancelling themselves out because the return current has
multiples paths, the current remaining in the neutral will not counterbalance
the current in the hot wire. The
resulting imbalance creates a magnetic field that can interfere with sensitive
electrical equipment. If metal conduit is included, the imbalance will induce
current into the conduit, and could cause the conduit to overheat. According to the NEC (National Electric Code),
you can only have one connection between the ground system and the neutral
system, and that must be at the Main Service Panel. This is also important for
the proper operation of Over Current Protection Devices.
12 hours of approved New York State, InterNACHI, & ASHI continuing education.
Here are some pictures from the 2017 sold out Niagara Frontier Home Inspectors Training Conference....
THANK YOU 2017 CONFERENCE SPONSORS!
- Guardian Financial
- Joe Ferry
- AccuStar Labs
- Secure24 Promos -ADT
- United Infrared
- Vanguard Emergency Management
- EMSL Analytical
- WNY Alliance of Home Inspectors
- Zonolite Attic Insulation Trust
- North American Mold Professionals Association (NAMPA)
- Inspector Pro Insurance
- Monroe Infrared
- Rad Elec
- NY Radon Response
- Healthy Homes Education & Consulting
- Inspector Services Group
- Mike Crow / Mastermind
- 2017 Niagara Frontier Home Inspectors Training Conference Trainers
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