Propane tank filling station class boundary

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pennelco

Member
Location
Pennsville NJ
We are installing a underground RSC conduit with seals at both ends to an outdoor propane tank filing station.
The pump motor is a 2 HP 208 V single phase.
A disconnect switch, motor starter and emergency stop button will be installed 26 feet from the tank filling location.

Where does the Class 1 and Division 2 boundary end? Is the 26 foot location an unclassified location and would a Nema 3R enclosure be permitted?

The disconnect switch is required no less than 25 feet and no more than 100 feet from the tank filling location.

Does the disconnect switch/motor starter and button need to be in an explosion proof enclosure at the 26 foot location?

 

rbalex

Moderator
Staff member
Location
Mission Viejo, CA
Occupation
Professional Electrical Engineer
We are installing a underground RSC conduit with seals at both ends to an outdoor propane tank filing station.
The pump motor is a 2 HP 208 V single phase.
A disconnect switch, motor starter and emergency stop button will be installed 26 feet from the tank filling location.

Where does the Class 1 and Division 2 boundary end? Is the 26 foot location an unclassified location and would a Nema 3R enclosure be permitted?

The disconnect switch is required no less than 25 feet and no more than 100 feet from the tank filling location.

Does the disconnect switch/motor starter and button need to be in an explosion proof enclosure at the 26 foot location?
Unfortunately, there isn't enough information to definitively answer your area classification boundary questions. You need someone familiar enough with the installation to help create the "proper documentation" required by Section 500.4(A). You will definitely be required to follow Article 515 and possibly 514, depending on the purpose of the filing station to determine the electrical area classification boundaries.

After the boundaries are settled, the rest of your questions can be answered accurately.

It should be noted the pump will create its own set of boundaries apart from the tank. [See Table 515.3] The single-phase motor associated with it will probably need to be explosionproof. [See Section 501.125(B)]

IF the "disconnect switch, motor starter and emergency stop button" are located inside the classified location they will also need to be explosionproof.
 

kwired

Electron manager
Location
NE Nebraska
The single-phase motor associated with it will probably need to be explosionproof. [See Section 501.125(B)]

If the pump and motor are sold as an assembly and are designed for use with LP gas this requirement is probably already met, just be aware that it is a requirement and double check just in case.
 
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