Hot tub help.

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masterinbama

masterinbama

Senior Member
Location
Huntsville Alabama
100 amp feeder to WP sub panel in SEU (2 hots, neutral and a bare ground). Subpanel has 50 amp GFCI breaker for hot tub and 2 15's for receptacles and lights.

As long as I install an insulated ground from here to the tub I am OK, correct? I am going to put in a bare #8 from the pump motor lug to the panel ground bar and leave a tail out for a future swimming pool equipotential bond. The slab the tub sits on is already poured and this panel was installed when the house was built.
 
masterinbama said:
100 amp feeder to WP sub panel in SEU (2 hots, neutral and a bare ground). Subpanel has 50 amp GFCI breaker for hot tub and 2 15's for receptacles and lights.

The slab the tub sits on is already poured and this panel was installed when the house was built.
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Sounds like you fall under the exception for the covered not insulated equipment ground for your 100 amp feed.


masterinbama said:
I am going to put in a bare #8 from the pump motor lug to the panel ground bar and leave a tail out for a future swimming pool equipotential bond.
Click to expand...

the equipotential bond is not required to be connected to equipment ground buss in the distrupution panel
 
david said:
the equipotential bond is not required to be connected to equipment ground buss in the distrupution panel
Click to expand...


I have no where else to tie it as the tub slab was there already. I was going to install it to that point to make it accessible when I do the pool deck and equipment grounding later this spring.
 
masterinbama said:
I have no where else to tie it as the tub slab was there already. I was going to install it to that point to make it accessible when I do the pool deck and equipment grounding later this spring.
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Can?t you go from the pool pump location to the location to where you are going to install the grid?.
Or from the hot tub location to the grid location?

I guess I do not understand why its necessary to go from the equipment ground bussin the 100 amp sub-panel to the grid
 
The tub still needs an equipotential bond unless it meets the criteria of the TIA and your area has accepted the amendment. The equipotential bonding only goes from the motor to the bonding grid not the panel as stated before.


Reference: 680.42(B)
TIA 11-1
(SC 11-3-10/TIA Log #1005)
Pursuant to Section 5 of the NFPA Regulations Governing Committee Projects, the National Fire Protection Association has issued
the following Tentative Interim Amendment to NFPA 70?
, National Electrical Code?
, 2011 edition. The TIA was processed by Panel
17 and the National Electrical Code Technical Correlating Committee, and was issued by the Standards Council on March 1, 2011,
with an effective date of March 21, 2011.
A Tentative Interim Amendment is tentative because it has not been processed through the entire standards-making procedures. It is
interim because it is effective only between editions of the standard. A TIA automatically becomes a proposal of the proponent for the
next edition of the standard; as such, it then is subject to all of the procedures of the standards-making process.
1. Revise 680.42(B) to read as follows:
680.42(B) Bonding. Bonding by metal-to-metal mounting on a common frame or base shall be permitted.
Exception No. 1: The metal bands or hoops used to secure wooden stavesshall not be required to be bonded as required in 680.26.
Exception No. 2: A listed self-contained spa or hot tub that meets all of the following conditions shall not be required to have
equipotential bonding of perimeter surfaces installed as required in 680.26(B)(2):
(1) Is installed in accordance with manufacturer?s instructions on or above grade.
(2) The vertical measurement from all permanent perimeter surfaces within 30 horizontal inches (76 cm) of the spa to the top
rim of the spa is greater than 28 inches (71 cm).
Informational Note: For further information regarding the grounding and bonding requirements for self-contained spas and hot
tubs, see ANSI/UL 1563 ? 2009, Standard for Electric Spas, Equipment Assemblies, and Associated Equipment.
Issue Date: March 1, 2011
Effective Date: March 21, 2011
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Thanks all, I was going from memory. I was just trying to get a quick grasp as this will only be my second hot tub in my 32 + years. Turns out the owner is going to break up some of the slab to allow the bond to be tied to the reinforcing wire in it and also to the new slab wire, pump, ladder, diving board etc.
 
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