Electrical, Branch Circuit | A.O. Smith DSE-5 THRU DSE-120 specs

ELECTRICAL

GENERAL

The installation must conform to these instructions, the local code authority having jurisdiction, and the requirements of the power company. In the absence of code requirements follow the latest version of NFPA-70, The National Electrical Code which may be ordered from: American National Standards Institute, 1430 Broadway, New York, NY 10018.

Voltage applied to the heater should not vary more than +5% to -10% of the model and rating plate marking for satisfactory operation.

DO NOT ENERGIZE THE BRANCH CIRCUIT FOR ANY REASON BEFORE THE HEATER TANK IS FILLED WITH WATER. DOING SO WILL CAUSE THE HEATING ELEMENT TO BURN OUT.

The branch circuit is connected to the heater wiring through an opening provided on the heater.

WARNING

AN ELECTRICAL GROUND IS REQUIRED TO REDUCE RISK OF ELECTRIC SHOCK OR POSSIBLE ELECTROCUTION. The water heater should be connected to a separate, grounded, branch circuit with overcurrent protection and disconnect switch. The water heater should be grounded in accordance with national and local codes.

Check the heater model and rating plate information against the characteristics of the branch circuit electrical supply. DO NOT CONNECT THE HEATER TO AN IMPROPER SOURCE OF ELECTRICITY.

BRANCH CIRCUIT

The branch circuit wire and fuse size should be established through reference to the latest version of the National Electrical Code or other locally approved source in conjunction with the heater amperage rating. Branch circuit wires should be 75°C temperature rated. For convenience, portions of the wire size tables from the Code are reproduced here. It is suggested the electrician size the branch circuit at 125 percent of the heater ampere rating and further increase wire size as necessary to compensate for voltage drop in long runs. Branch circuit voltage drop should not exceed 3% at the heater.

				TABLE 310-16. Allowable Ampacities of Insulated Conductors
			Not More Than Three Conductors in Raceway or Cable or Earth
			(Directly Buried),			Based on Ambient Temperature of					30°C (86°F)

Size					Temperature		Rating of	Conductor, See table 310-13							Size
		60°C	75°C		85°C		90°C		60°C	75°C		85°C		90°C
		(140°F)	(167°F)		(185°F)		(194°F)		(140°F)	(167°F)		(185°F)		(194°F)
		TYPES	TYPES		TYPES		TYPES		TYPES	TYPES		TYPES		TYPES
		RUW, T	FEPW		V, MI		TA, TBS		RUW, T	RH, RHW		V, MI		TA, TBS,
AWG		TW, UF	RH,RHW				SA, AVB		TW, UF	RUH				SA, AVB
			RUH,				SIS, =FEP,			THW,				SIS,	AWG
			THW,				=FEPB,			THWN				=RHH,
MCM			THWN,				=RHH,			XHHW,				=THHN,	MCM
			XHHW				=THHN,			USE				=XHHW*
			USE, ZW				=XHHW*
			COPPER						ALUMINUM OR COPPER-CLAD ALUMINUM
18		……	……	……	21		……		……	……		……	……
16		……	……	22			22	……	……	……		……		……
16		……	……	22			22	……	……	……		……		……
14		15	15		25		25		……	……	……	……		……
12		20	20		30		30		15	15		25		25	12
10		30	30		40		40		25	25		30		30	10
8		40	45		50		50		30	40		40		40	8
	6	55	65		70		70		40	50		55		55	6
4		70	85		90		90		55	65		70		70	4
3		80	100		105		105		65	75		80		80	3
2			115		120		120		75	90		95		95	2
	1		130		140		140			100		110		110	1
0			150		155		155			120		125		125	0
00			175		185		185			135		145		145	00
000			200		210		210			155		165		165	000
	0000		230		235		235			180		185		185	0000
250			255		270		270			205		215		215	250
300			285		300		300			230		240		240	300
350			310		325		325			250		260		260	350
400			335		360		360			270		290		290	400
	500		380		405		405			310		330		330	500

CORRECTION FACTORS


Ambient		For ambient temperatures over 30°C, multiply the amacities shown by the appropriate												Ambient
Temp.°C			correction factor to determine the maximum allowable load current.											Temp.°F
31-40	.82		.88	.90		.91	.82		.88		.90	.91		86-104
41-50	.58		.75	.80		.82	.58		.75		.80	.82		105-122
51-60	……		.58	.67		.71	……		.58	.	67	.71	123	-141
61-70	……		.35	.52		.58	……		.35	.	52	.58	142	-158
71-80	……		……	.30	.	41	……	……	.30		.41	159-176

=The load current rating and the overcurrent protection for these conductors shall not exceed 15 amperes for 14 AWG, 20 amperes for 12 AWG, and 30 amperes for 10 AWG copper; or 15 amperes for 12 AWG and 25 amperes for 10 AWG aluminum and copper-clad aluminum.

* For dry locations only. See 75°C column for wet locations.

DSE-5 THRU DSE-120 specifications

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