installing non-automatic transfer switch

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  #1  
Old 01-08-11, 11:00 AM
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installing non-automatic transfer switch

I have questions about installing a Gen-Tran, 30 amp, non-automatic transfer switch, #301660, just to the right of two, C-H 200 amp service panels(400 amp service) on my basement concrete wall. My 60 amp feeder breaker goes in the right service panel. I want to provide emergency service to my 240V, 20 amp well pump and 120V, 20 amp furnace circuits, currently wired to the right panel, and to my 20 amp small appliance/refrigerator circuit and 15 amp bathroom lighting/ventilation circuit, currently wired to the left. My questions are:
1. Should I splice the neutrals of the circuits in the left panel to the neutral/ground bar in the right panel which contains the feeder breaker?
2. Can I leave disconnected circuit breakers in the service panels in place?
3. Must the spliced conductors from the service panels to the transfer switch be marked?
4. Do the four emergency circuits overload my 30 amp transfer switch by code? How do I calculate the load for eating area small appliances in the small appliance circuit below?
Well pump full-load current = 6.9 amp(Table 430.248).
Furnace full-load current = 13.8 amp(Table 430.248); EIM(controller) = 0.2-1.0 running
amps specified in installation manual.
Small appliance circuit: refrigerator label load current = 7.2 amp[440.6(A)]; 13 115V
duplex receptacle outlets for eating area small appliances = ? amps by code.
Bathroom lighting/ventilation circuit: 7 fixtures with fluorescent bulbs = 1.2 amp; 2
ventilation fans = 1.8 amp; 3 115V duplex, general use receptacle outlets = 0
amp[220.14(J)]
5. For the branch circuits, does code require calculation of allowable ampacity of the spliced conductors from the service panels to the transfer switch, or can I use the 90(THHN) #12 AWG provided by Gen-Tran? Existing wiring is NM-B, 12-2G for the 20 amp circuits and 14-2 for the bathroom circuit.
6. For calculating allowable ampacity of the 90(THHN) #6 AWG conductors provided by Gen-Tran for the 60 amp feeder service from the right service panel, what ambient temperature correction factor should I apply to the allowable ampacity in Table 310.15(B)(16)?
7. Must I connect my portable generator's ground lug to an earth ground? If so, what is the best way? I have outdoor access to my home's ground electrode and steel wellhead.
8. Is flush-mounting a Reliance power inlet box to the sheetrock interior wall of my garage about 12 above the slab okay? Only the cap will protrude about 1 from the wall.
9. What areas of the NEC will the test allowing homeowner installation likely cover?
 
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  #2  
Old 01-08-11, 02:20 PM
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Have you heard of an Interlock Kit? Generator InterLock Kit

Cheaper. Easier. Faster. Better.
 
  #3  
Old 01-08-11, 02:48 PM
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Sorry Auger...
The first 3 yes probably.....better..very debatable. Also..some panels will not accept them or will not be UL listed if they are installed. From what I understand some areas do not allow their installation as well.
 
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Old 01-09-11, 01:33 PM
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Not familair with the Gen tran but they should have installtion instructions online. Here is a link to Reliance, a competitor who has a video on one being installed. Might give you some insight...
 
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Old 01-09-11, 02:14 PM
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Old 01-09-11, 05:57 PM
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Originally Posted by zunden View Post
1. Should I splice the neutrals of the circuits in the left panel to the neutral/ground bar in the right panel which contains the feeder breaker?
All of the transferred circuits need to come from the same panel. You'll need to relocate the circuits from the left service panel into the right service panel before you splice them over to the transfer switch.

2. Can I leave disconnected circuit breakers in the service panels in place?
Yes, but make sure to change the label to "none" or something like that. You could also replace the breakers with blank inserts.

3. Must the spliced conductors from the service panels to the transfer switch be marked?
No, but it can't hurt.

4. Do the four emergency circuits overload my 30 amp transfer switch by code?
Generally we don't do a load calc on the manual panels because it's up to the homeowner to manually manage the load when on generator power. It's close enough on your 30A panel that you might need to cycle your water pump on opposite the furnace to keep from tripping the breaker or stalling the genny.

...circuit conductors...
All of the conductors provided with the trans panel are okay.

7. Must I connect my portable generator's ground lug to an earth ground?
Not for a portable generator. It will be grounded by virtue of the ground wire in the hookup cord.

8. Is flush-mounting a Reliance power inlet box to the sheetrock interior wall of my garage about 12 above the slab okay?
Should be okay as long as it's accessible. I would go minimum 24" from the garage floor -- some jurisdictions enforce this height (gas fumes hang to the floor).

9. What areas of the NEC will the test allowing homeowner installation likely cover?
It's a local matter, so it's hard to say. I'd guess probably simple stuff like wiring up receptacles and light switches.
 
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