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How many errors about electrical code ?

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Externet

Active Member
Hi.
A typical ordinary electric range/stove fed by split phase 230V and neutral (3 contacts) outlet on a 40A breaker feeds also a plain overhead fan/light hood assembly.

115V is taken from the outlet at the baseboard into the wall and up to the hood assembly on AWG16 'zip cord' cable.

Phase-----------------------------------------------------------------outlet--------------1A inline fuse-------------hood
Neutral---------------------------------------------------------------outlet--------------------------------------------hood
Phase-----------------------------------------------------------------outlet

There is no dedicated ground wire; just the neutral I assume bonds to the stove chassis?, and a metal conduit that ends at the outlet, appears to be original unmolested construction on a 1992 house.
How bad/dangerous/against electrical code is that ? Or was it perfectly normal then and code has been updated since ?

Picture borrowed from the net :
----> http://www.myrv.us/electric/img/N 10-50R 125-250-volt.jpg
 

Reloadron

Well-Known Member
Most Helpful Member
The three prong outlet would be acceptable for pre 1996 construction.
In residences built before 1996, the National Electric Code (NEC) required only a 3-prong outlet for electric dryers and ranges. As safety requirements became more stringent, the NEC began requiring a 4-prong outlet for new installations of circuits that provide power to these appliances. For new homes under construction, or for existing homes that convert from gas appliances to electric appliances, it is now required to install the 4-prong outlets.

The reason for this is safety. The older 3-prong outlets connected the neutral and ground wires together. This opened up the possibility of current flowing on to the ground wire and could lead to the metal frame of the stove or dryer becoming energized. If this happened, the result could be a shock delivered to the user when touching the appliance. So what is a person to do when they get home and find that their new appliance won’t fit the old outlet on their wall? You simply replace the appliance cord. Most retailers that deal in appliances, and even many big box retailers sell replacement cords for dryers and stoves.
The above quote taken from here. Note that continuing to use the three prong outlet is acceptable and if a new appliance is added just buy a three prong plug to mate with the outlet.

While we use gas for the stove when we renovated the laundry room I replaced the power to the clothes drier and installed a new 4 prong socket to mate with the new drier.

The zip cord in the wall is not acceptable. Minimum in the wall should be AWG 14. My father-in-law managed to start a small fire in a wall running zip cord to a home brew outlet.

Ron
 
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